Bash — per-model detail

Every failing sample below is the real generated shell script, with the stdout/exit-code mismatch that rejected it. Trial 0 runs at temperature 0, trials 1 and 2 at 0.7 — so a task passing 1/3 is a sampling-luck pass, not a reliable one. Models are ordered best first. Other technologies: C · Python · Bash · research · how to reproduce.

Reproduce this benchmark

Setup and model serving are on the models index — including a script-free version using nothing but curl and a compiler; with a server running, this is the exact command that produced the samples below:

# Bash suite (8 easy + 3 hard tasks, 3 trials each)
python scripts/eval_bash.py --target <model> --set all --trials 3 \
    --dump-failures results/failures
python scripts/eval_bash.py --target <model> --set brutal --trials 3 \
    --dump-failures results/failures --json > results/<model>-brutal-bash.json
# stdout must match exactly and the exit code must be 0.

qwen3.8-flash-next 125B 93% overall↑ top

Served via llama.cpp CUDA · — tok/s · — GB RAM · coding total 117/126

Bash — 18/24 (0.3 min / 1.7k tok)

extract_urls — 0/3 passed
prompt sent to the model
Implement in bash: `extract_urls`. Reads stdin, prints every http:// or https:// URL found, one per line, in order of appearance. Nothing else.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]]+'
}
trial 1 (temp 0.7) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]]+'
}
trial 2 (temp 0.7) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]]+'
}
rotate — 0/3 passed
prompt sent to the model
Implement in bash: `rotate <file>`. Rotates logs one level: <file>.1 becomes <file>.2, then <file> becomes <file>.1. If <file>.1 does not exist, just rename <file> to <file>.1.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — timeout
rotate() {
    local file="$1"
    local i=1
    while [ -f "${file}.${i}" ]; do
        mv "${file}.${i}" "${file}.$((i + 1))"
        i=$((i + 1))
    done
    mv "$file" "${file}.1"
}
trial 1 (temp 0.7) — timeout
rotate() {
    local file="$1"
    local i=1
    while [ -f "${file}.${i}" ]; do
        mv "${file}.${i}" "${file}.$((i + 1))"
        i=$((i + 1))
    done
    mv "$file" "${file}.1"
}
trial 2 (temp 0.7) — timeout
rotate() {
    local file="$1"
    local i=1
    while [ -f "${file}.${i}" ]; do
        mv "${file}.${i}" "${file}.$((i + 1))"
        i=$((i + 1))
    done
    mv "$file" "${file}.1"
}

Bash (hard) — 6/9 (0.3 min / 2.4k tok)

find_dupes — 0/3 passed
prompt sent to the model
Implement in bash: `find_dupes <dir>`. Finds groups of regular files under <dir> (recursive) with identical content (compare by MD5). Prints one group per line: space-separated paths, sorted, only groups of 2+ files. Groups sorted by first path. Must work on macOS (BSD userland: no GNU find -printf, no md5sum — use md5 -r).
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — FAIL got:
find_dupes() {
    local dir="$1"
    local tmpfile=$(mktemp)
    
    # Find all regular files, compute MD5, store hash and path
    find "$dir" -type f -exec md5 -r {} \; 2>/dev/null | while IFS= read -r line; do
        # md5 -r outputs: <hash> <path>
        local hash="${line%% *}"
        local path="${line#* }"
        echo "$hash $path"
    done > "$tmpfile"
    
    # Group by hash, filter groups with 2+ files, sort paths within group, sort groups by first path
    awk '
    {
        hash = $1
        path = substr($0, length(hash) + 2)
        if (hash in groups) {
            groups[hash] = groups[hash] "\n" path
        } else {
            groups[hash] = path
        }
        count[hash]++
    }
    END {
        for (hash in groups) {
            if (count[hash] >= 2) {
                n = split(groups[hash], paths, "\n")
                # Sort paths
                for (i = 1; i <= n; i++) {
                    for (j = i + 1; j <= n; j++) {
                        if (paths[i] > paths[j]) {
                            tmp = paths[i]
                            paths[i] = paths[j]
                            paths[j] = tmp
                        }
                    }
                }
                # Build output line
                out = ""
                for (i = 1; i <= n; i++) {
                    if (i > 1) out = out " "
                    out = out paths[i]
                }
                print out
            }
        }
    }
    ' "$tmpfile" | sort
    
    rm -f "$tmpfile"
}
trial 1 (temp 0.7) — fail — FAIL got:
find_dupes() {
    local dir="$1"
    local tmpfile=$(mktemp)
    
    # Find all regular files, compute MD5, store hash and path
    find "$dir" -type f -exec md5 -r {} \; 2>/dev/null | while IFS= read -r line; do
        # md5 -r outputs: <hash> <path>
        local hash="${line%% *}"
        local path="${line#* }"
        echo "$hash $path"
    done > "$tmpfile"
    
    # Group by hash, filter groups with 2+ files, sort paths within group, sort groups by first path
    awk '
    {
        hash = $1
        path = substr($0, length(hash) + 2)
        if (hash in groups) {
            groups[hash] = groups[hash] "\n" path
        } else {
            groups[hash] = path
        }
        count[hash]++
    }
    END {
        for (hash in groups) {
            if (count[hash] >= 2) {
                n = split(groups[hash], paths, "\n")
                # Sort paths
                for (i = 1; i <= n; i++) {
                    for (j = i + 1; j <= n; j++) {
                        if (paths[i] > paths[j]) {
                            tmp = paths[i]
                            paths[i] = paths[j]
                            paths[j] = tmp
                        }
                    }
                }
                # Build output line
                out = ""
                for (i = 1; i <= n; i++) {
                    if (i > 1) out = out " "
                    out = out paths[i]
                }
                print out
            }
        }
    }
    ' "$tmpfile" | sort
    
    rm -f "$tmpfile"
}
trial 2 (temp 0.7) — fail — FAIL got:
find_dupes() {
    local dir="$1"
    local tmpfile=$(mktemp)
    
    # Find all regular files, compute MD5, store hash and path
    find "$dir" -type f -exec md5 -r {} \; 2>/dev/null | while IFS= read -r line; do
        # md5 -r outputs: <hash> <path>
        local hash="${line%% *}"
        local path="${line#* }"
        echo "$hash $path"
    done > "$tmpfile"
    
    # Group by hash, filter groups with 2+ files, sort paths within group, sort groups by first path
    awk '
    {
        hash = $1
        path = substr($0, length(hash) + 2)
        if (hash in groups) {
            groups[hash] = groups[hash] "\n" path
        } else {
            groups[hash] = path
        }
        count[hash]++
    }
    END {
        for (hash in groups) {
            if (count[hash] >= 2) {
                n = split(groups[hash], paths, "\n")
                # Sort paths
                for (i = 1; i <= n; i++) {
                    for (j = i + 1; j <= n; j++) {
                        if (paths[i] > paths[j]) {
                            tmp = paths[i]
                            paths[i] = paths[j]
                            paths[j] = tmp
                        }
                    }
                }
                # Build output line
                out = ""
                for (i = 1; i <= n; i++) {
                    if (i > 1) out = out " "
                    out = out paths[i]
                }
                print out
            }
        }
    }
    ' "$tmpfile" | sort
    
    rm -f "$tmpfile"
}

gpt-oss-120b 88% overall↑ top

Served via llama.cpp CUDA · — tok/s · — GB RAM · coding total 111/126

Bash — 18/24 (0.5 min / 8.9k tok)

count_matches — 0/3 passed
prompt sent to the model
Implement in bash: `count_matches <pattern> <file>`. Prints the number of lines in <file> matching <pattern> (fixed string). Prints 0 when nothing matches.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — FAIL count zzz
count_matches() {
    local pattern=$1
    local file=$2

    # Use grep with fixed-string matching and count lines.
    # -F : treat pattern as a fixed string
    # -c : output the count of matching lines
    # -- : end of options (handles patterns beginning with '-')
    grep -F -c -- "$pattern" "$file" 2>/dev/null || echo 0
}
trial 1 (temp 0.7) — fail — FAIL count zzz
count_matches() {
    local pattern=$1
    local file=$2

    # Use grep with fixed-string matching and count lines.
    # -F : treat pattern as a fixed string
    # -c : output the count of matching lines
    # -- : end of options (handles patterns beginning with '-')
    grep -F -c -- "$pattern" "$file" 2>/dev/null || echo 0
}
trial 2 (temp 0.7) — fail — FAIL count zzz
count_matches() {
    local pattern=$1
    local file=$2

    # Use grep with fixed-string matching and count lines.
    # -F : treat pattern as a fixed string
    # -c : output the count of matching lines
    # -- : end of options (handles patterns beginning with '-')
    grep -F -c -- "$pattern" "$file" 2>/dev/null || echo 0
}
extract_urls — 1/3 passed
prompt sent to the model
Implement in bash: `extract_urls`. Reads stdin, prints every http:// or https:// URL found, one per line, in order of appearance. Nothing else.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 1 (temp 0.7) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]]+' |
    sed -e 's/[)\]\}>.,;:!?]*$//'
}
trial 2 (temp 0.7) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]]+' |
    sed -e 's/[)\]\}>.,;:!?]*$//'
}
json_get — 2/3 passed
prompt sent to the model
Implement in bash: `json_get <key>`. Reads a flat JSON object on stdin and prints the string value of top-level <key>. python3 is available; jq is not.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — FAIL name
json_get() {
    local key=$1
    python3 - "$key" <<'PY'
import sys, json

key = sys.argv[1]

try:
    data = json.load(sys.stdin)
except Exception:
    sys.exit(1)

value = data.get(key)

if isinstance(value, str):
    sys.stdout.write(value)
elif value is not None:
    sys.stdout.write(str(value))
# If the key is missing, output nothing
PY
}

Bash (hard) — 4/9 (0.6 min / 10.0k tok)

find_dupes — 0/3 passed
prompt sent to the model
Implement in bash: `find_dupes <dir>`. Finds groups of regular files under <dir> (recursive) with identical content (compare by MD5). Prints one group per line: space-separated paths, sorted, only groups of 2+ files. Groups sorted by first path. Must work on macOS (BSD userland: no GNU find -printf, no md5sum — use md5 -r).
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — solution.sh: line 15: md5map["$hash"]: bad array subscript
find_dupes() {
    local dir=$1
    if [[ -z $dir ]]; then
        echo "Usage: find_dupes <dir>" >&2
        return 1
    fi

    # associative array: md5 => newline‑separated list of files
    declare -A md5map

    # Gather md5 hashes for all regular files under $dir
    while IFS= read -r -d '' file; do
        # md5 -r prints: "<hash> <filename>"
        hash=$(md5 -r "$file" 2>/dev/null | awk '{print $1}')
        md5map["$hash"]+=$'\n'"$file"
    done < <(find "$dir" -type f -print0 2>/dev/null)

    # Build and output groups (2+ files) sorted as required
    {
        for hash in "${!md5map[@]}"; do
            # split the stored newline‑separated list into an array
            files=()
            while IFS= read -r f; do
                [[ -n $f ]] && files+=("$f")
            done <<< "${md5map[$hash]}"

            (( ${#files[@]} < 2 )) && continue   # ignore singletons

            # sort the paths within the group
            sorted=$(printf '%s\n' "${files[@]}" | sort)

            # join with spaces and output the group line
            line=$(printf '%s ' $sorted)
            echo "${line% }"
        done
    } | sort -k1,1
}
trial 1 (temp 0.7) — fail — solution.sh: line 15: md5map["$hash"]: bad array subscript
find_dupes() {
    local dir=$1
    if [[ -z $dir ]]; then
        echo "Usage: find_dupes <dir>" >&2
        return 1
    fi

    # temporary file for hash‑path pairs
    local tmp
    tmp=$(mktemp) || return

    # generate "<md5> <path>" lines for every regular file
    find "$dir" -type f -print0 2>/dev/null |
        while IFS= read -r -d '' file; do
            md5 -r "$file" 2>/dev/null
        done > "$tmp"

    local prev_hash="" path
    local -a paths group_lines

    # sort by hash, then collect groups
    while IFS= read -r hash path; do
        if [[ $hash != $prev_hash && $prev_hash != "" ]]; then
            if (( ${#paths[@]} > 1 )); then
                sorted=$(printf '%s\n' "${paths[@]}" | LC_ALL=C sort | tr '\n' ' ')
                group_lines+=("${sorted% }")
            fi
            paths=()
        fi
        paths+=("$path")
        prev_hash=$hash
    done < <(LC_ALL=C sort "$tmp")

    # handle the final group
    if (( ${#paths[@]} > 1 )); then
        sorted=$(printf '%s\n' "${paths[@]}" | LC_ALL=C sort | tr '\n' ' ')
        group_lines+=("${sorted% }")
    fi

    # output groups sorted by their first path
    printf '%s\n' "${group_lines[@]}" | LC_ALL=C sort -k1,1

    rm -f "$tmp"
}
trial 2 (temp 0.7) — fail — solution.sh: line 15: md5map["$hash"]: bad array subscript
find_dupes() {
    local dir=$1
    if [[ -z $dir ]]; then
        echo "Usage: find_dupes <dir>" >&2
        return 1
    fi

    # temporary file for hash‑path pairs
    local tmp
    tmp=$(mktemp) || return

    # generate "<md5> <path>" lines for every regular file
    find "$dir" -type f -print0 2>/dev/null |
        while IFS= read -r -d '' file; do
            md5 -r "$file" 2>/dev/null
        done > "$tmp"

    local prev_hash="" path
    local -a paths group_lines

    # sort by hash, then collect groups
    while IFS= read -r hash path; do
        if [[ $hash != $prev_hash && $prev_hash != "" ]]; then
            if (( ${#paths[@]} > 1 )); then
                sorted=$(printf '%s\n' "${paths[@]}" | LC_ALL=C sort | tr '\n' ' ')
                group_lines+=("${sorted% }")
            fi
            paths=()
        fi
        paths+=("$path")
        prev_hash=$hash
    done < <(LC_ALL=C sort "$tmp")

    # handle the final group
    if (( ${#paths[@]} > 1 )); then
        sorted=$(printf '%s\n' "${paths[@]}" | LC_ALL=C sort | tr '\n' ' ')
        group_lines+=("${sorted% }")
    fi

    # output groups sorted by their first path
    printf '%s\n' "${group_lines[@]}" | LC_ALL=C sort -k1,1

    rm -f "$tmp"
}
top_errors — 1/3 passed
prompt sent to the model
Implement in bash: `top_errors <logfile> <n>`. Prints the n most frequent ERROR signatures in <logfile>. A signature is the text after 'ERROR: ' with every run of digits replaced by '#'. Output one per line as '<count> <signature>', sorted by count descending, then signature ascending. Print nothing if there are no ERROR lines.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 1 (temp 0.7) — fail — 3 disk # full
top_errors() {
    local logfile=$1 n=$2
    [[ -r $logfile && $n =~ ^[0-9]+$ ]] || return

    grep -a 'ERROR: ' "$logfile" |
    sed -e 's/.*ERROR: //' -e 's/[0-9]\+/#/g' |
    sort |
    uniq -c |
    sort -k1,1nr -k2,2 |
    head -n "$n"
}
trial 2 (temp 0.7) — fail — 3 disk # full
top_errors() {
    local logfile=$1
    local n=$2

    awk '/ERROR: /{
            sub(/.*ERROR: /, "")
            gsub(/[0-9]+/, "#")
            print
        }' "$logfile" |
    sort |
    uniq -c |
    sort -k1,1nr -k2,2 |
    head -n "$n"
}

laguna-s 2.1 117B 86% overall↑ top

Served via llama.cpp CUDA · — tok/s · — GB RAM · coding total 108/126

Bash — 18/24 (0.2 min / 1.9k tok)

count_matches — 0/3 passed
prompt sent to the model
Implement in bash: `count_matches <pattern> <file>`. Prints the number of lines in <file> matching <pattern> (fixed string). Prints 0 when nothing matches.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — FAIL count zzz
count_matches() {
    grep -F -c -- "$1" "$2" 2>/dev/null || echo 0
}
trial 1 (temp 0.7) — fail — FAIL count zzz
count_matches() {
    local pattern="$1"
    local file="$2"
    grep -F -c -- "$pattern" "$file" 2>/dev/null || echo 0
}
trial 2 (temp 0.7) — fail — FAIL count zzz
count_matches() {
    local pattern="$1"
    local file="$2"
    grep -F -c -- "$pattern" "$file" 2>/dev/null || echo 0
}
extract_urls — 0/3 passed
prompt sent to the model
Implement in bash: `extract_urls`. Reads stdin, prints every http:// or https:// URL found, one per line, in order of appearance. Nothing else.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]]+'
}
trial 1 (temp 0.7) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]]+'
}
trial 2 (temp 0.7) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]]+'
}

Bash (hard) — 3/9 (0.2 min / 1.5k tok)

find_dupes — 0/3 passed
prompt sent to the model
Implement in bash: `find_dupes <dir>`. Finds groups of regular files under <dir> (recursive) with identical content (compare by MD5). Prints one group per line: space-separated paths, sorted, only groups of 2+ files. Groups sorted by first path. Must work on macOS (BSD userland: no GNU find -printf, no md5sum — use md5 -r).
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — awk: cmd. line:11: ^ unterminated string
find_dupes() {
    local dir="$1"
    find "$dir" -type f -exec md5 -r {} + 2>/dev/null |
    awk '{
        hash = $1
        $1 = ""
        sub(/^ /, "")
        paths[hash] = paths[hash] " " $0
        count[hash]++
    }
    END {
        for (h in count) {
            if (count[h] > 1) {
                cmd = "echo \"" paths[h] "\" | tr ' ' '\n' | grep -v '^$' | sort | tr '\n' ' '"
                cmd | getline sorted
                close(cmd)
                sub(/ $/, "", sorted)
                print sorted
            }
        }
    }' | sort
}
trial 1 (temp 0.7) — fail — awk: cmd. line:11: ^ unterminated string
find_dupes() {
    local dir="$1"
    find "$dir" -type f -exec md5 -r {} + 2>/dev/null |
    awk '{
        hash = $1
        $1 = ""
        sub(/^ /, "")
        paths[hash] = paths[hash] " " $0
        count[hash]++
    }
    END {
        for (h in count) {
            if (count[h] > 1) {
                cmd = "echo \"" paths[h] "\" | tr ' ' '\n' | grep -v '^$' | sort | tr '\n' ' '"
                cmd | getline sorted
                close(cmd)
                sub(/ $/, "", sorted)
                print sorted
            }
        }
    }' | sort
}
trial 2 (temp 0.7) — fail — awk: cmd. line:11: ^ unterminated string
find_dupes() {
    local dir="$1"
    find "$dir" -type f -exec md5 -r {} + 2>/dev/null |
    awk '{
        hash = $1
        $1 = ""
        sub(/^ /, "")
        paths[hash] = paths[hash] " " $0
        count[hash]++
    }
    END {
        for (h in count) {
            if (count[h] > 1) {
                cmd = "echo \"" paths[h] "\" | tr ' ' '\n' | grep -v '^$' | sort | tr '\n' ' '"
                cmd | getline sorted
                close(cmd)
                sub(/ $/, "", sorted)
                print sorted
            }
        }
    }' | sort
}
backup_rotate — 0/3 passed
prompt sent to the model
Implement in bash: `backup_rotate <dir> <keep>`. In <dir>, deletes all but the <keep> newest files matching backup-*.tar.gz (newest = lexicographically greatest names). Prints each deleted file's name (not path), one per line, oldest first. Deletes nothing if there are <= <keep> backups (prints nothing).
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — backup-20260103-120000.tar.gz
backup_rotate() {
    local dir="$1"
    local keep="$2"
    local files=()
    while IFS= read -r -d '' f; do
        files+=("$f")
    done < <(find "$dir" -maxdepth 1 -type f -name 'backup-*.tar.gz' -print0 | sort -rz)
    local count=${#files[@]}
    if (( count <= keep )); then
        return 0
    fi
    local start=$((count - keep))
    for ((i = 0; i < start; i++)); do
        local basename
        basename=$(basename "${files[$i]}")
        rm -f "${files[$i]}"
        printf '%s\n' "$basename"
    done
}
trial 1 (temp 0.7) — fail — backup-20260103-120000.tar.gz
backup_rotate() {
    local dir="$1"
    local keep="$2"
    local files=()
    while IFS= read -r -d '' f; do
        files+=("$f")
    done < <(find "$dir" -maxdepth 1 -type f -name 'backup-*.tar.gz' -print0 | sort -rz)
    local count=${#files[@]}
    if (( count <= keep )); then
        return 0
    fi
    local start=$((count - keep))
    for ((i = 0; i < start; i++)); do
        local basename
        basename=$(basename "${files[$i]}")
        rm -f "${files[$i]}"
        printf '%s\n' "$basename"
    done
}
trial 2 (temp 0.7) — fail — backup-20260103-120000.tar.gz
backup_rotate() {
    local dir="$1"
    local keep="$2"
    local files=()
    while IFS= read -r -d '' f; do
        files+=("$f")
    done < <(find "$dir" -maxdepth 1 -type f -name 'backup-*.tar.gz' -print0 | sort -rz)
    local count=${#files[@]}
    if (( count <= keep )); then
        return 0
    fi
    local start=$((count - keep))
    for ((i = 0; i < start; i++)); do
        local basename
        basename=$(basename "${files[$i]}")
        rm -f "${files[$i]}"
        printf '%s\n' "$basename"
    done
}

gemma-4-26b 83% overall↑ top

Served via llama.cpp CUDA · — tok/s · — GB RAM · coding total 105/126

Bash — 15/24 (0.1 min / 1.4k tok)

count_matches — 0/3 passed
prompt sent to the model
Implement in bash: `count_matches <pattern> <file>`. Prints the number of lines in <file> matching <pattern> (fixed string). Prints 0 when nothing matches.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — FAIL count zzz
count_matches() {
    grep -F -c "$1" "$2" 2>/dev/null || echo 0
}
trial 1 (temp 0.7) — fail — FAIL count zzz
count_matches() {
    grep -F -c "$1" "$2" 2>/dev/null || echo 0
}
trial 2 (temp 0.7) — fail — FAIL count zzz
count_matches() {
    grep -F -c "$1" "$2" 2>/dev/null || echo 0
}
retry3 — 0/3 passed
prompt sent to the model
Implement in bash: `retry3 <cmd...>`. Runs the command; if it fails, retries up to 3 total attempts. Exits 0 if any attempt succeeds, otherwise exits with the last attempt's exit code.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — FAIL flaky never succeeded
retry3() {
    local n=0
    local exit_code=0
    while [ $n -lt 3 ]; do
        "$@" && return 0
        exit_code=$?
        n=$((n + 1))
    done
    return $exit_code
}
trial 1 (temp 0.7) — fail — FAIL flaky never succeeded
retry3() {
    local n=0
    local exit_code=0
    while [ $n -lt 3 ]; do
        "$@" && return 0
        exit_code=$?
        n=$((n + 1))
    done
    return $exit_code
}
trial 2 (temp 0.7) — fail — FAIL flaky never succeeded
retry3() {
    local n=0
    local exit_code=0
    while [ $n -lt 3 ]; do
        "$@" && return 0
        exit_code=$?
        n=$((n + 1))
    done
    return $exit_code
}
extract_urls — 0/3 passed
prompt sent to the model
Implement in bash: `extract_urls`. Reads stdin, prints every http:// or https:// URL found, one per line, in order of appearance. Nothing else.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — https://c.net
extract_urls() {
  grep -oE 'https?://[^[:space:]"<>]+'
}
trial 1 (temp 0.7) — fail — https://c.net
extract_urls() {
  grep -oE 'https?://[^[:space:]"<>]+'
}
trial 2 (temp 0.7) — fail — https://c.net
extract_urls() {
  grep -oE 'https?://[^[:space:]"<>]+'
}

Bash (hard) — 3/9 (0.3 min / 4.1k tok)

find_dupes — 0/3 passed
prompt sent to the model
Implement in bash: `find_dupes <dir>`. Finds groups of regular files under <dir> (recursive) with identical content (compare by MD5). Prints one group per line: space-separated paths, sorted, only groups of 2+ files. Groups sorted by first path. Must work on macOS (BSD userland: no GNU find -printf, no md5sum — use md5 -r).
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — find: ‘md5’: No such file or directory
find_dupes() {
    local search_dir="$1"
    find "$search_dir" -type f -exec md5 -r {} + | \
    awk '{
        hash = $1;
        $1 = "";
        sub(/^ /, "", $0);
        paths[hash] = paths[hash] ? paths[hash] " " $0 : $0;
        count[hash]++;
    }
    END {
        for (h in count) {
            if (count[h] > 1) {
                split(paths[h], p, " ");
                # Sort paths within the group
                asort(p);
                line = "";
                for (i=1; i<=count[h]; i++) {
                    line = (line == "" ? p[i] : line " " p[i]);
                }
                print line;
            }
        }
    }' | sort
}
trial 1 (temp 0.7) — fail — find: ‘md5’: No such file or directory
find_dupes() {
    local search_dir="$1"
    find "$search_dir" -type f -exec md5 -r {} + | \
    awk '{
        hash = $1;
        $1 = "";
        sub(/^ /, "", $0);
        paths[hash] = paths[hash] ? paths[hash] " " $0 : $0;
        count[hash]++;
    }
    END {
        for (h in count) {
            if (count[h] > 1) {
                split(paths[h], arr, " ");
                # Sort paths within the group
                asort(arr);
                line = "";
                for (i=1; i<=count[h]; i++) {
                    line = (line == "" ? arr[i] : line " " arr[i]);
                }
                print line;
            }
        }
    }' | sort
}
trial 2 (temp 0.7) — fail — find: ‘md5’: No such file or directory
find_dupes() {
    local search_dir="$1"
    find "$search_dir" -type f -exec md5 -r {} + | \
    awk '{
        hash = $1;
        $1 = "";
        sub(/^ /, "", $0);
        paths[hash] = paths[hash] ? paths[hash] " " $0 : $0;
        count[hash]++;
    }
    END {
        for (h in count) {
            if (count[h] > 1) {
                split(paths[h], arr, " ");
                # Sort paths within the group
                asort(arr);
                line = "";
                for (i=1; i<=count[h]; i++) {
                    line = (line == "" ? arr[i] : line " " arr[i]);
                }
                print line;
            }
        }
    }' | sort
}
top_errors — 0/3 passed
prompt sent to the model
Implement in bash: `top_errors <logfile> <n>`. Prints the n most frequent ERROR signatures in <logfile>. A signature is the text after 'ERROR: ' with every run of digits replaced by '#'. Output one per line as '<count> <signature>', sorted by count descending, then signature ascending. Print nothing if there are no ERROR lines.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — truncated — hit the 1024-token cap
top_errors() {
    local logfile="$1"
    local n="$2"

    if [[ ! -f "$logfile" ]]; then
        return
    fi

    grep "ERROR: " "$logfile" | \
    sed 's/.*ERROR: //' | \
    sed -E 's/[0-9]+/#/g' | \
    sort | \
    uniq -c | \
    sort -k1,1nr -k2,2 | \
    head -n "$n" | \
    awk '{count=$1; $1=""; print count substr($0,2)}' | \
    sed 's/^[ \t]*//' | \
    awk '{count=$1; $1=""; print count " " substr($0,2)}' | \
    while read -r count sig; do
        echo "$count $sig"
    done | \
    sort -k1,1nr -k2,2 | \
    head -n "$n"
}
trial 1 (temp 0.7) — fail — hit the 1024-token cap
top_errors() {
    local logfile="$1"
    local n="$2"

    if [[ ! -f "$logfile" ]]; then
        return
    fi

    grep "ERROR: " "$logfile" | \
    sed 's/.*ERROR: //' | \
    sed -E 's/[0-9]+/#/g' | \
    sort | \
    uniq -c | \
    sort -k1,1nr -k2,2 | \
    head -n "$n" | \
    awk '{count=$1; $1=""; print count substr($0,2)}' | \
    sed 's/^[ \t]*//' | \
    awk '{count=$1; $1=""; print count " " substr($0,2)}' | \
    while read -r count sig; do
        echo "$count $sig"
    done | \
    awk '{count=$1; $1=""; print count " " substr($0,2)}' | \
    sed 's/^[ \t]*//' | \
    while read -r line; do
        echo "$line"
    done | \
    sort -k1,1nr -k2,2 | \
    head -n "$n" | \
    awk '{c=$1; $1=""; print c " " substr($0,2)}' | \
    sed 's/^[ \t]*//' | \
    while read -r line; do
        echo "$line"
    done
}
trial 2 (temp 0.7) — fail — hit the 1024-token cap
top_errors() {
    local logfile="$1"
    local n="$2"

    if [[ ! -f "$logfile" ]]; then
        return
    fi

    grep "ERROR: " "$logfile" | \
    sed 's/.*ERROR: //' | \
    sed -E 's/[0-9]+/#/g' | \
    sort | \
    uniq -c | \
    sort -k1,1nr -k2,2 | \
    head -n "$n" | \
    awk '{count=$1; $1=""; print count substr($0,2)}' | \
    sed 's/^[ \t]*//' | \
    awk '{count=$1; $1=""; print count " " substr($0,2)}' | \
    while read -r count sig; do
        echo "$count $sig"
    done | \
    awk '{count=$1; $1=""; print count " " substr($0,2)}' | \
    sed 's/^[ \t]*//' | \
    while read -r line; do
        echo "$line"
    done | \
    sort -k1,1nr -k2,2 | \
    head -n "$n" | \
    awk '{c=$1; $1=""; print c " " substr($0,2)}' | \
    sed 's/^[ \t]*//' | \
    while read -r line; do
        echo "$line"
    done
}

qwen3.5-35b 83% overall↑ top

Served via llama.cpp CUDA · — tok/s · — GB RAM · coding total 105/126

Bash — 18/24 (0.1 min / 2.1k tok)

count_matches — 0/3 passed
prompt sent to the model
Implement in bash: `count_matches <pattern> <file>`. Prints the number of lines in <file> matching <pattern> (fixed string). Prints 0 when nothing matches.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — FAIL count zzz
count_matches() {
  local pattern="$1"
  local file="$2"
  if [[ -z "$pattern" || -z "$file" ]]; then
    echo 0
    return
  fi
  grep -F -c -- "$pattern" "$file" 2>/dev/null || echo 0
}
trial 1 (temp 0.7) — fail — FAIL count zzz
count_matches() {
  local pattern="$1"
  local file="$2"
  if [[ -z "$pattern" || -z "$file" ]]; then
    echo 0
    return
  fi
  grep -F -c -- "$pattern" "$file" 2>/dev/null || echo 0
}
trial 2 (temp 0.7) — fail — FAIL count zzz
count_matches() {
  local pattern="$1"
  local file="$2"
  if [[ -z "$pattern" || -z "$file" ]]; then
    echo 0
    return
  fi
  grep -F -c -- "$pattern" "$file" 2>/dev/null || echo 0
}
extract_urls — 0/3 passed
prompt sent to the model
Implement in bash: `extract_urls`. Reads stdin, prints every http:// or https:// URL found, one per line, in order of appearance. Nothing else.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — https://c.net
extract_urls() {
  grep -oE 'https?://[^[:space:]"<>'\''\)]+'
}
trial 1 (temp 0.7) — fail — https://c.net
extract_urls() {
  grep -oE 'https?://[^[:space:]"<>'\''\)]+'
}
trial 2 (temp 0.7) — fail — https://c.net
extract_urls() {
  grep -oE 'https?://[^[:space:]"<>'\''\)]+'
}

Bash (hard) — 3/9 (0.2 min / 2.4k tok)

find_dupes — 0/3 passed
prompt sent to the model
Implement in bash: `find_dupes <dir>`. Finds groups of regular files under <dir> (recursive) with identical content (compare by MD5). Prints one group per line: space-separated paths, sorted, only groups of 2+ files. Groups sorted by first path. Must work on macOS (BSD userland: no GNU find -printf, no md5sum — use md5 -r).
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — FAIL got:
find_dupes() {
  local dir="$1"
  if [[ -z "$dir" ]]; then
    echo "Usage: find_dupes <dir>" >&2
    return 1
  fi

  # Find all regular files, compute MD5, format as "md5 path"
  # Use -print0 and read -d '' to handle filenames with spaces/newlines safely
  find "$dir" -type f -print0 | while IFS= read -r -d '' file; do
    # macOS uses 'md5 -r' for raw output (just the hash)
    hash=$(md5 -r "$file" 2>/dev/null | cut -d' ' -f1)
    if [[ -n "$hash" ]]; then
      printf '%s\t%s\n' "$hash" "$file"
    fi
  done | sort -t$'\t' -k1,1 -k2,2 | \
  awk -F'\t' '
    {
      if ($1 == prev_hash) {
        paths[NR] = $2
        count++
      } else {
        if (count > 1) {
          # Sort the paths for this group
          n = asort(paths, sorted_paths)
          line = ""
          for (i = 1; i <= n; i++) {
            line = line (i > 1 ? " " : "") sorted_paths[i]
          }
          print line
        }
        prev_hash = $1
        count = 1
        delete paths
        paths[NR] = $2
      }
    }
    END {
      if (count > 1) {
        n = asort(paths, sorted_paths)
        line = ""
        for (i = 1; i <= n; i++) {
          line = line (i > 1 ? " " : "") sorted_paths[i]
        }
        print line
      }
    }
  ' | sort
}
trial 1 (temp 0.7) — fail — FAIL got:
find_dupes() {
  local dir="$1"
  if [[ -z "$dir" ]]; then
    echo "Usage: find_dupes <dir>" >&2
    return 1
  fi

  # Find all regular files, compute MD5, format as "md5 path"
  # Use -print0 and read -d '' to handle filenames with spaces/newlines safely
  find "$dir" -type f -print0 | while IFS= read -r -d '' file; do
    # macOS uses 'md5 -r' for raw output (just the hash)
    hash=$(md5 -r "$file" 2>/dev/null | cut -d' ' -f1)
    if [[ -n "$hash" ]]; then
      printf '%s\t%s\n' "$hash" "$file"
    fi
  done | sort -t$'\t' -k1,1 -k2,2 | \
  awk -F'\t' '
    {
      if ($1 == prev_hash) {
        paths[NR] = $2
        count++
      } else {
        if (count > 1) {
          # Sort the paths for this group
          n = asort(paths, sorted_paths)
          line = ""
          for (i = 1; i <= n; i++) {
            line = line (i > 1 ? " " : "") sorted_paths[i]
          }
          print line
        }
        prev_hash = $1
        count = 1
        delete paths
        paths[NR] = $2
      }
    }
    END {
      if (count > 1) {
        n = asort(paths, sorted_paths)
        line = ""
        for (i = 1; i <= n; i++) {
          line = line (i > 1 ? " " : "") sorted_paths[i]
        }
        print line
      }
    }
  ' | sort
}
trial 2 (temp 0.7) — fail — FAIL got:
find_dupes() {
  local dir="$1"
  if [[ -z "$dir" ]]; then
    echo "Usage: find_dupes <dir>" >&2
    return 1
  fi

  # Find all regular files, compute MD5, format as "md5 path"
  # Use -print0 and read -d '' to handle filenames with spaces/newlines safely
  find "$dir" -type f -print0 | while IFS= read -r -d '' file; do
    # macOS uses 'md5 -r' for raw output (just the hash)
    hash=$(md5 -r "$file" 2>/dev/null | cut -d' ' -f1)
    if [[ -n "$hash" ]]; then
      printf '%s\t%s\n' "$hash" "$file"
    fi
  done | sort -t$'\t' -k1,1 -k2,2 | \
  awk -F'\t' '
    {
      if ($1 == prev_hash) {
        paths[NR] = $2
        count++
      } else {
        if (count > 1) {
          # Sort the paths for this group
          n = asort(paths, sorted_paths)
          line = ""
          for (i = 1; i <= n; i++) {
            line = line (i > 1 ? " " : "") sorted_paths[i]
          }
          print line
        }
        prev_hash = $1
        count = 1
        delete paths
        paths[NR] = $2
      }
    }
    END {
      if (count > 1) {
        n = asort(paths, sorted_paths)
        line = ""
        for (i = 1; i <= n; i++) {
          line = line (i > 1 ? " " : "") sorted_paths[i]
        }
        print line
      }
    }
  ' | sort
}
top_errors — 0/3 passed
prompt sent to the model
Implement in bash: `top_errors <logfile> <n>`. Prints the n most frequent ERROR signatures in <logfile>. A signature is the text after 'ERROR: ' with every run of digits replaced by '#'. Output one per line as '<count> <signature>', sorted by count descending, then signature ascending. Print nothing if there are no ERROR lines.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — 3 disk
top_errors() {
    local logfile="$1"
    local n="$2"
    
    if [[ -z "$logfile" || -z "$n" ]]; then
        return 1
    fi

    grep -o 'ERROR: [^[:space:]]*' "$logfile" 2>/dev/null | \
    sed 's/ERROR: //' | \
    sed 's/[0-9]\+/#/g' | \
    sort | uniq -c | \
    sort -k1,1nr -k2,2 | \
    head -n "$n" | \
    awk '{print $1, $2}'
}
trial 1 (temp 0.7) — fail — 3 disk
top_errors() {
    local logfile="$1"
    local n="$2"
    
    if [[ -z "$logfile" || -z "$n" ]]; then
        return 1
    fi

    grep -o 'ERROR: [^[:space:]]*' "$logfile" 2>/dev/null | \
    sed 's/ERROR: //' | \
    sed 's/[0-9]\+/#/g' | \
    sort | uniq -c | \
    sort -k1,1nr -k2,2 | \
    head -n "$n" | \
    awk '{print $1, $2}'
}
trial 2 (temp 0.7) — fail — 3 disk
top_errors() {
    local logfile="$1"
    local n="$2"
    
    if [[ -z "$logfile" || -z "$n" ]]; then
        return 1
    fi

    grep -o 'ERROR: [^[:space:]]*' "$logfile" 2>/dev/null | \
    sed 's/ERROR: //' | \
    sed 's/[0-9]\+/#/g' | \
    sort | uniq -c | \
    sort -k1,1nr -k2,2 | \
    head -n "$n" | \
    awk '{print $1, $2}'
}

laguna-xs.2 83% overall↑ top

Served via llama.cpp CUDA · — tok/s · — GB RAM · coding total 105/126

Bash — 21/24 (0.1 min / 1.8k tok)

extract_urls — 0/3 passed
prompt sent to the model
Implement in bash: `extract_urls`. Reads stdin, prints every http:// or https:// URL found, one per line, in order of appearance. Nothing else.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]]+' |
    while IFS= read -r url; do
        echo "$url"
    done
}
trial 1 (temp 0.7) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]"]+' |
    sed 's/[")[:space:].*//'
}
trial 2 (temp 0.7) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]"]+' |
    sed 's/[")[:space:].*//'
}

Bash (hard) — 5/9 (0.1 min / 2.2k tok)

find_dupes — 0/3 passed
prompt sent to the model
Implement in bash: `find_dupes <dir>`. Finds groups of regular files under <dir> (recursive) with identical content (compare by MD5). Prints one group per line: space-separated paths, sorted, only groups of 2+ files. Groups sorted by first path. Must work on macOS (BSD userland: no GNU find -printf, no md5sum — use md5 -r).
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — FAIL got:
find_dupes() {
    local dir="$1"
    local tmpfile
    tmpfile=$(mktemp)
    local tmpfile2
    tmpfile2=$(mktemp)
    
    # Find all regular files and compute their MD5 hashes
    find "$dir" -type f | while IFS= read -r file; do
        md5 -r "$file" 2>/dev/null | awk -v file="$file" '{print $1 "\t" file}'
    done > "$tmpfile"
    
    # Group files by hash and output groups with 2+ files
    awk -F'\t' '
    {
        hash = $1
        file = $2
        files[hash] = files[hash] (files[hash] ? " " : "") file
        count[hash]++
    }
    END {
        for (hash in count) {
            if (count[hash] >= 2) {
                n = split(files[hash], arr, " ")
                # Sort the files in the group
                for (i = 1; i <= n; i++) {
                    for (j = i + 1; j <= n; j++) {
                        if (arr[i] > arr[j]) {
                            tmp = arr[i]
                            arr[i] = arr[j]
                            arr[j] = tmp
                        }
                    }
                }
                # Build the sorted line
                line = arr[1]
                for (i = 2; i <= n; i++) {
                    line = line " " arr[i]
                }
                print line
            }
        }
    }' "$tmpfile" | sort > "$tmpfile2"
    
    cat "$tmpfile2"
    
    rm -f "$tmpfile" "$tmpfile2"
}
trial 1 (temp 0.7) — fail — FAIL got:
find_dupes() {
    local dir="$1"
    local tmpfile
    tmpfile=$(mktemp)
    local tmpfile2
    tmpfile2=$(mktemp)
    
    # Find all regular files and compute their MD5 hashes
    find "$dir" -type f | while IFS= read -r file; do
        md5 -r "$file" 2>/dev/null | awk -v file="$file" '{print $1 "\t" file}'
    done > "$tmpfile"
    
    # Group files by hash and output groups with 2+ files
    awk -F'\t' '
    {
        hash = $1
        file = $2
        files[hash] = files[hash] (files[hash] ? " " : "") file
        count[hash]++
    }
    END {
        for (hash in count) {
            if (count[hash] >= 2) {
                n = split(files[hash], arr, " ")
                # Sort the file paths
                for (i = 1; i <= n; i++) {
                    for (j = i + 1; j <= n; j++) {
                        if (arr[i] > arr[j]) {
                            tmp = arr[i]
                            arr[i] = arr[j]
                            arr[j] = tmp
                        }
                    }
                }
                # Build sorted line
                line = arr[1]
                for (i = 2; i <= n; i++) {
                    line = line " " arr[i]
                }
                print line
            }
        }
    }' "$tmpfile" | sort > "$tmpfile2"
    
    cat "$tmpfile2"
    
    rm -f "$tmpfile" "$tmpfile2"
}
trial 2 (temp 0.7) — fail — FAIL got:
find_dupes() {
    local dir="$1"
    local tmpfile
    tmpfile=$(mktemp)
    local tmpfile2
    tmpfile2=$(mktemp)
    
    # Find all regular files and compute their MD5 hashes
    find "$dir" -type f | while IFS= read -r file; do
        md5 -r "$file" 2>/dev/null | awk -v file="$file" '{print $1 "\t" file}'
    done > "$tmpfile"
    
    # Group files by hash and output groups with 2+ files
    awk -F'\t' '
    {
        hash = $1
        file = $2
        files[hash] = files[hash] (files[hash] ? " " : "") file
        count[hash]++
    }
    END {
        for (hash in count) {
            if (count[hash] >= 2) {
                n = split(files[hash], arr, " ")
                # Sort the file paths
                for (i = 1; i <= n; i++) {
                    for (j = i + 1; j <= n; j++) {
                        if (arr[i] > arr[j]) {
                            tmp = arr[i]
                            arr[i] = arr[j]
                            arr[j] = tmp
                        }
                    }
                }
                # Build sorted line
                line = arr[1]
                for (i = 2; i <= n; i++) {
                    line = line " " arr[i]
                }
                print line
            }
        }
    }' "$tmpfile" | sort > "$tmpfile2"
    
    cat "$tmpfile2"
    
    rm -f "$tmpfile" "$tmpfile2"
}
backup_rotate — 2/3 passed
prompt sent to the model
Implement in bash: `backup_rotate <dir> <keep>`. In <dir>, deletes all but the <keep> newest files matching backup-*.tar.gz (newest = lexicographically greatest names). Prints each deleted file's name (not path), one per line, oldest first. Deletes nothing if there are <= <keep> backups (prints nothing).
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — FAIL dir has 6 files
backup_rotate() {
    local dir="$1"
    local keep="$2"
    local backups=()
    
    while IFS= read -r -d '' file; do
        backups+=("$(basename "$file")")
    done < <(find "$dir" -maxdepth 1 -name 'backup-*.tar.gz' -print0 | sort -z)
    
    local count=${#backups[@]}
    
    if (( count <= keep )); then
        return
    fi
    
    local to_delete=$((count - keep))
    
    for ((i = 0; i < to_delete; i++)); do
        echo "${backups[$i]}"
    done
}

nemotron-3-super 120B 83% overall↑ top

Served via llama.cpp CUDA · — tok/s · — GB RAM · coding total 105/126

Bash — 18/24 (0.3 min / 1.9k tok)

count_matches — 0/3 passed
prompt sent to the model
Implement in bash: `count_matches <pattern> <file>`. Prints the number of lines in <file> matching <pattern> (fixed string). Prints 0 when nothing matches.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — FAIL count zzz
count_matches() {
    local pattern="$1"
    local file="$2"
    grep -F -c "$pattern" "$file" 2>/dev/null || echo 0
}
trial 1 (temp 0.7) — fail — FAIL count zzz
count_matches() {
    local pattern="$1"
    local file="$2"
    grep -F -c "$pattern" "$file" 2>/dev/null || echo 0
}
trial 2 (temp 0.7) — fail — FAIL count zzz
count_matches() {
    local pattern="$1"
    local file="$2"
    grep -F -c "$pattern" "$file" 2>/dev/null || echo 0
}
extract_urls — 0/3 passed
prompt sent to the model
Implement in bash: `extract_urls`. Reads stdin, prints every http:// or https:// URL found, one per line, in order of appearance. Nothing else.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]]+' | tr '\n' '\n'
}
trial 1 (temp 0.7) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]]+' | tr '\n' '\n'
}
trial 2 (temp 0.7) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]]+' | tr '\n' '\n'
}

Bash (hard) — 3/9 (0.2 min / 1.4k tok)

find_dupes — 0/3 passed
prompt sent to the model
Implement in bash: `find_dupes <dir>`. Finds groups of regular files under <dir> (recursive) with identical content (compare by MD5). Prints one group per line: space-separated paths, sorted, only groups of 2+ files. Groups sorted by first path. Must work on macOS (BSD userland: no GNU find -printf, no md5sum — use md5 -r).
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — find: ‘md5’: No such file or directory
find_dupes() {
    local dir="$1"
    find "$dir" -type f -exec md5 -r {} + | sort | awk '
        {
            md5 = $1
            file = $2
            if (md5 in groups) {
                groups[md5] = groups[md5] " " file
            } else {
                groups[md5] = file
            }
        }
        END {
            for (md5 in groups) {
                split(groups[md5], files, " ")
                if (length(files) >= 2) {
                    n = asort(files)
                    line = ""
                    for (i = 1; i <= n; i++) {
                        line = line (i > 1 ? " " : "") files[i]
                    }
                    print line
                }
            }
        }' | sort
}
trial 1 (temp 0.7) — fail — find: ‘md5’: No such file or directory
find_dupes() {
    local dir="$1"
    find "$dir" -type f -exec md5 -r {} + | sort | awk '
        {
            md5 = $1
            file = $2
            if (md5 in groups) {
                groups[md5] = groups[md5] " " file
            } else {
                groups[md5] = file
            }
        }
        END {
            for (md5 in groups) {
                split(groups[md5], files, " ")
                if (length(files) >= 2) {
                    n = asort(files)
                    line = ""
                    for (i = 1; i <= n; i++) {
                        line = line (i > 1 ? " " : "") files[i]
                    }
                    print line
                }
            }
        }' | sort
}
trial 2 (temp 0.7) — fail — find: ‘md5’: No such file or directory
find_dupes() {
    local dir="$1"
    find "$dir" -type f -exec md5 -r {} + | sort | awk '
        {
            md5 = $1
            file = $2
            if (md5 in groups) {
                groups[md5] = groups[md5] " " file
            } else {
                groups[md5] = file
            }
        }
        END {
            for (md5 in groups) {
                split(groups[md5], files, " ")
                if (length(files) >= 2) {
                    n = asort(files)
                    line = ""
                    for (i = 1; i <= n; i++) {
                        line = line (i > 1 ? " " : "") files[i]
                    }
                    print line
                }
            }
        }' | sort
}
top_errors — 0/3 passed
prompt sent to the model
Implement in bash: `top_errors <logfile> <n>`. Prints the n most frequent ERROR signatures in <logfile>. A signature is the text after 'ERROR: ' with every run of digits replaced by '#'. Output one per line as '<count> <signature>', sorted by count descending, then signature ascending. Print nothing if there are no ERROR lines.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — 3 disk
top_errors() {
    local logfile="$1"
    local n="$2"
    grep -o 'ERROR: .*' "$logfile" | sed 's/^ERROR: //; s/[0-9]\+/#/g' | sort | uniq -c | sort -k1,1nr -k2,2 | head -n "$n" | awk '{print $1, $2}'
}
trial 1 (temp 0.7) — fail — 3 disk
top_errors() {
    local logfile="$1"
    local n="$2"
    grep -o 'ERROR: .*' "$logfile" | sed 's/^ERROR: //; s/[0-9]\+/#/g' | sort | uniq -c | sort -k1,1nr -k2,2 | head -n "$n" | awk '{print $1, $2}'
}
trial 2 (temp 0.7) — fail — 3 disk
top_errors() {
    local logfile="$1"
    local n="$2"
    grep -o 'ERROR: .*' "$logfile" | sed 's/^ERROR: //; s/[0-9]\+/#/g' | sort | uniq -c | sort -k1,1nr -k2,2 | head -n "$n" | awk '{print $1, $2}'
}

gpt-oss-20b 81% overall↑ top

Served via llama.cpp CUDA · — tok/s · — GB RAM · coding total 102/126

Bash — 18/24 (0.7 min / 15.0k tok)

count_matches — 2/3 passed
prompt sent to the model
Implement in bash: `count_matches <pattern> <file>`. Prints the number of lines in <file> matching <pattern> (fixed string). Prints 0 when nothing matches.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — FAIL count zzz
count_matches() {
  local pattern="$1"
  local file="$2"
  grep -F -c "$pattern" "$file" 2>/dev/null || echo 0
}
retry3 — 2/3 passed
prompt sent to the model
Implement in bash: `retry3 <cmd...>`. Runs the command; if it fails, retries up to 3 total attempts. Exits 0 if any attempt succeeds, otherwise exits with the last attempt's exit code.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail
retry3() {
  local attempts=3
  local i=1
  local exit_code=0
  while (( i <= attempts )); do
    "$@" || exit_code=$?
    if (( exit_code == 0 )); then
      exit 0
    fi
    (( i++ ))
  done
  exit "$exit_code"
}
extract_urls — 0/3 passed
prompt sent to the model
Implement in bash: `extract_urls`. Reads stdin, prints every http:// or https:// URL found, one per line, in order of appearance. Nothing else.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]]+'
}
trial 1 (temp 0.7) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]]+'
}
trial 2 (temp 0.7) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]]+'
}
json_get — 2/3 passed
prompt sent to the model
Implement in bash: `json_get <key>`. Reads a flat JSON object on stdin and prints the string value of top-level <key>. python3 is available; jq is not.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
json_get() {
  local key="$1"
  python3 - <<'PY' "$key"
import sys, json, argparse
parser = argparse.ArgumentParser()
parser.add_argument("key")
args = parser.parse_args()
data = json.load(sys.stdin)
print(data.get(args.key, ""))
PY
}

Bash (hard) — 4/9 (1.3 min / 28.6k tok)

find_dupes — 0/3 passed
prompt sent to the model
Implement in bash: `find_dupes <dir>`. Finds groups of regular files under <dir> (recursive) with identical content (compare by MD5). Prints one group per line: space-separated paths, sorted, only groups of 2+ files. Groups sorted by first path. Must work on macOS (BSD userland: no GNU find -printf, no md5sum — use md5 -r).
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — truncated — hit the 4096-token cap
find_dupes() {
    local dir="$1"
    if [[ -z "$dir" ]]; then
        echo "Usage: find_dupes <dir>" >&2
        return 1
    fi

    find "$dir" -type f -print0 | \
    while IFS= read -r -d '' file; do
        # Compute MD5 hash (BSD md5 -r)
        local hash
        hash=$(md5 -r "$file" | awk '{print $1}')
        printf '%s\t%s\n' "$hash" "$file"
    done | \
    sort -k1,1 -k2,2 | \
    awk -F'\t' '
        {
            if ($1 != curhash) {
                if (n > 1) {
                    out = paths[1]
                    for (i = 2; i <= n; i++) out = out " " paths[i]
                    print out
                }
                curhash = $1
                n = 0
            }
            n++
            paths[n] = $2
        }
        END {
            if (n > 1) {
                out = paths[1]
                for (i = 2; i <= n; i++) out = out " " paths[i]
                print out
            }
        }
    ' | sort -k1,1
}
trial 1 (temp 0.7) — fail — hit the 4096-token cap
find_dupes() {
    local dir="$1"
    if [[ -z "$dir" ]]; then
        echo "Usage: find_dupes <dir>" >&2
        return 1
    fi

    find "$dir" -type f -print0 | while IFS= read -r -d '' file; do
        md5 -r "$file" | awk '
            { hash=$1; sub(/^([a-f0-9]+) +/, "", $0); print hash "\t" $0 }
        '
    done | sort -k1,1 -k2,2 | awk -F'\t' '
        {
            if (prev != $1) {
                if (count >= 2) print group
                prev = $1
                group = $2
                count = 1
            } else {
                group = group " " $2
                count++
            }
        }
        END {
            if (count >= 2) print group
        }
    ' | sort -k1,1
}
trial 2 (temp 0.7) — fail — hit the 4096-token cap
find_dupes() {
    local dir="$1"
    if [[ -z "$dir" ]]; then
        echo "Usage: find_dupes <dir>" >&2
        return 1
    fi

    find "$dir" -type f -print0 | while IFS= read -r -d '' file; do
        md5 -r "$file" | awk '
            { hash=$1; sub(/^([a-f0-9]+) +/, "", $0); print hash "\t" $0 }
        '
    done | sort -k1,1 -k2,2 | awk -F'\t' '
        {
            if (prev != $1) {
                if (count >= 2) print group
                prev = $1
                group = $2
                count = 1
            } else {
                group = group " " $2
                count++
            }
        }
        END {
            if (count >= 2) print group
        }
    ' | sort -k1,1
}
top_errors — 1/3 passed
prompt sent to the model
Implement in bash: `top_errors <logfile> <n>`. Prints the n most frequent ERROR signatures in <logfile>. A signature is the text after 'ERROR: ' with every run of digits replaced by '#'. Output one per line as '<count> <signature>', sorted by count descending, then signature ascending. Print nothing if there are no ERROR lines.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 1 (temp 0.7) — truncated — hit the 4096-token cap
top_errors() {
    local logfile="$1"
    local n="$2"
    [[ -z "$logfile" || -z "$n" ]] && return

    awk -F'ERROR: ' '/ERROR: /{print $2}' "$logfile" |
        sed 's/[0-9]\+/#/g' |
        sort |
        uniq -c |
        sort -k1,1nr -k2,2 |
        head -n "$n"
}
trial 2 (temp 0.7) — truncated — hit the 4096-token cap
(no code extracted)

qwen3.8-27b 81% overall↑ top

Served via llama.cpp CUDA · — tok/s · — GB RAM · coding total 102/126

Bash — 15/24 (0.4 min / 1.7k tok)

count_matches — 0/3 passed
prompt sent to the model
Implement in bash: `count_matches <pattern> <file>`. Prints the number of lines in <file> matching <pattern> (fixed string). Prints 0 when nothing matches.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — FAIL count zzz
count_matches() {
    local pattern="$1"
    local file="$2"
    grep -cF -- "$pattern" "$file" 2>/dev/null || echo 0
}
trial 1 (temp 0.7) — fail — FAIL count zzz
count_matches() {
    local pattern="$1"
    local file="$2"
    grep -cF -- "$pattern" "$file" 2>/dev/null || echo 0
}
trial 2 (temp 0.7) — fail — FAIL count zzz
count_matches() {
    local pattern="$1"
    local file="$2"
    grep -cF -- "$pattern" "$file" 2>/dev/null || echo 0
}
extract_urls — 0/3 passed
prompt sent to the model
Implement in bash: `extract_urls`. Reads stdin, prints every http:// or https:// URL found, one per line, in order of appearance. Nothing else.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]"'"'"'<>]+'
}
trial 1 (temp 0.7) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]"'"'"'<>]+'
}
trial 2 (temp 0.7) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]"'"'"'<>]+'
}
csv_col — 0/3 passed
prompt sent to the model
Implement in bash: `csv_col <name>`. Reads a CSV from stdin (first line is a header). Prints the values of the column named <name>, one per line, in order.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — FAIL got:
csv_col() {
    local name="$1"
    local header
    header=$(head -n 1)
    local idx
    idx=$(echo "$header" | awk -F',' -v col="$name" '{for(i=1;i<=NF;i++) if($i==col){print i; exit}}')
    if [[ -z "$idx" ]]; then
        return 1
    fi
    tail -n +2 | awk -F',' -v idx="$idx" '{print $idx}'
}
trial 1 (temp 0.7) — fail — FAIL got:
csv_col() {
    local name="$1"
    local header
    header=$(head -n 1)
    local idx
    idx=$(echo "$header" | awk -F',' -v col="$name" '{for(i=1;i<=NF;i++) if($i==col){print i; exit}}')
    if [[ -z "$idx" ]]; then
        return 1
    fi
    tail -n +2 | awk -F',' -v idx="$idx" '{print $idx}'
}
trial 2 (temp 0.7) — fail — FAIL got:
csv_col() {
    local name="$1"
    local header
    header=$(head -n 1)
    local idx
    idx=$(echo "$header" | awk -F',' -v col="$name" '{for(i=1;i<=NF;i++) if($i==col){print i; exit}}')
    if [[ -z "$idx" ]]; then
        return 1
    fi
    tail -n +2 | awk -F',' -v idx="$idx" '{print $idx}'
}

Bash (hard) — 3/9 (0.5 min / 2.2k tok)

find_dupes — 0/3 passed
prompt sent to the model
Implement in bash: `find_dupes <dir>`. Finds groups of regular files under <dir> (recursive) with identical content (compare by MD5). Prints one group per line: space-separated paths, sorted, only groups of 2+ files. Groups sorted by first path. Must work on macOS (BSD userland: no GNU find -printf, no md5sum — use md5 -r).
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — solution.sh: line 19: md5_map[$hash]: bad array subscript
find_dupes() {
    local dir="$1"
    local -a files=()
    local -A md5_map=()
    local -a md5s=()

    # Find all regular files recursively
    while IFS= read -r -d '' f; do
        files+=("$f")
    done < <(find "$dir" -type f -print0)

    # Compute MD5 for each file and group by hash
    local f hash
    for f in "${files[@]}"; do
        hash=$(md5 -r "$f" | awk '{print $1}')
        if [[ -n "${md5_map[$hash]+x}" ]]; then
            md5_map[$hash]+=" $f"
        else
            md5_map[$hash]="$f"
            md5s+=("$hash")
        fi
    done

    # Collect groups with 2+ files
    local -a groups=()
    local h
    for h in "${md5s[@]}"; do
        local -a group_files=()
        read -ra group_files <<< "${md5_map[$h]}"
        if (( ${#group_files[@]} >= 2 )); then
            # Sort the files in this group
            local sorted
            sorted=$(printf '%s\n' "${group_files[@]}" | sort)
            groups+=("$sorted")
        fi
    done

    # Sort groups by their first path
    if (( ${#groups[@]} > 0 )); then
        printf '%s\n' "${groups[@]}" | sort | while IFS= read -r line; do
            printf '%s\n' "$line"
        done
    fi
}
trial 1 (temp 0.7) — fail — solution.sh: line 19: md5_map[$hash]: bad array subscript
find_dupes() {
    local dir="$1"
    local -a files=()
    local -A md5_map=()
    local -a md5s=()

    # Find all regular files recursively
    while IFS= read -r -d '' f; do
        files+=("$f")
    done < <(find "$dir" -type f -print0)

    # Compute MD5 for each file and group by hash
    local f hash
    for f in "${files[@]}"; do
        hash=$(md5 -r "$f" | awk '{print $1}')
        if [[ -n "${md5_map[$hash]+x}" ]]; then
            md5_map[$hash]+=" $f"
        else
            md5_map[$hash]="$f"
            md5s+=("$hash")
        fi
    done

    # Collect groups with 2+ files
    local -a groups=()
    local h
    for h in "${md5s[@]}"; do
        local -a group_files=()
        read -ra group_files <<< "${md5_map[$h]}"
        if (( ${#group_files[@]} >= 2 )); then
            # Sort the files in this group
            local sorted
            sorted=$(printf '%s\n' "${group_files[@]}" | sort)
            groups+=("$sorted")
        fi
    done

    # Sort groups by their first path
    if (( ${#groups[@]} > 0 )); then
        printf '%s\n' "${groups[@]}" | sort | while IFS= read -r line; do
            printf '%s\n' "$line"
        done
    fi
}
trial 2 (temp 0.7) — fail — solution.sh: line 19: md5_map[$hash]: bad array subscript
find_dupes() {
    local dir="$1"
    local -a files=()
    local -A md5_map=()
    local -a md5s=()

    # Find all regular files recursively
    while IFS= read -r -d '' f; do
        files+=("$f")
    done < <(find "$dir" -type f -print0)

    # Compute MD5 for each file and group by hash
    local f hash
    for f in "${files[@]}"; do
        hash=$(md5 -r "$f" | awk '{print $1}')
        if [[ -n "${md5_map[$hash]+x}" ]]; then
            md5_map[$hash]+=" $f"
        else
            md5_map[$hash]="$f"
            md5s+=("$hash")
        fi
    done

    # Collect groups with 2+ files
    local -a groups=()
    local h
    for h in "${md5s[@]}"; do
        local -a group_files=()
        read -ra group_files <<< "${md5_map[$h]}"
        if (( ${#group_files[@]} >= 2 )); then
            # Sort the files in this group
            local sorted
            sorted=$(printf '%s\n' "${group_files[@]}" | sort)
            groups+=("$sorted")
        fi
    done

    # Sort groups by their first path
    if (( ${#groups[@]} > 0 )); then
        printf '%s\n' "${groups[@]}" | sort | while IFS= read -r line; do
            printf '%s\n' "$line"
        done
    fi
}
top_errors — 0/3 passed
prompt sent to the model
Implement in bash: `top_errors <logfile> <n>`. Prints the n most frequent ERROR signatures in <logfile>. A signature is the text after 'ERROR: ' with every run of digits replaced by '#'. Output one per line as '<count> <signature>', sorted by count descending, then signature ascending. Print nothing if there are no ERROR lines.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — 3 disk
top_errors() {
    local logfile="$1"
    local n="$2"

    # Extract ERROR lines, get text after 'ERROR: ', replace runs of digits with #
    # Then count, sort by count desc then signature asc, take top n
    grep -E 'ERROR: ' "$logfile" 2>/dev/null | \
    sed -E 's/.*ERROR: //' | \
    sed -E 's/[0-9]+/#/g' | \
    sort | \
    uniq -c | \
    awk '{print $1, $2}' | \
    sort -k1,1nr -k2,2 | \
    head -n "$n"
}
trial 1 (temp 0.7) — fail — 3 disk
top_errors() {
    local logfile="$1"
    local n="$2"

    # Extract ERROR lines, get text after 'ERROR: ', replace runs of digits with #
    # Then count, sort by count desc then signature asc, take top n
    grep -E 'ERROR: ' "$logfile" 2>/dev/null | \
    sed -E 's/.*ERROR: //' | \
    sed -E 's/[0-9]+/#/g' | \
    sort | \
    uniq -c | \
    awk '{print $1, $2}' | \
    sort -k1,1nr -k2,2 | \
    head -n "$n"
}
trial 2 (temp 0.7) — fail — 3 disk
top_errors() {
    local logfile="$1"
    local n="$2"

    # Extract ERROR lines, get text after 'ERROR: ', replace runs of digits with #
    # Then count, sort by count desc then signature asc, take top n
    grep -E 'ERROR: ' "$logfile" 2>/dev/null | \
    sed -E 's/.*ERROR: //' | \
    sed -E 's/[0-9]+/#/g' | \
    sort | \
    uniq -c | \
    awk '{print $1, $2}' | \
    sort -k1,1nr -k2,2 | \
    head -n "$n"
}

qwen3-coder-next 80B 79% overall↑ top

Served via llama.cpp CUDA · — tok/s · — GB RAM · coding total 99/126

Bash — 18/24 (0.1 min / 1.6k tok)

extract_urls — 0/3 passed
prompt sent to the model
Implement in bash: `extract_urls`. Reads stdin, prints every http:// or https:// URL found, one per line, in order of appearance. Nothing else.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]"<>]*'
}
trial 1 (temp 0.7) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]"<>]*'
}
trial 2 (temp 0.7) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]"<>]*'
}
csv_col — 0/3 passed
prompt sent to the model
Implement in bash: `csv_col <name>`. Reads a CSV from stdin (first line is a header). Prints the values of the column named <name>, one per line, in order.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — 25
csv_col() {
    local name="$1"
    local col_num
    IFS=',' read -ra headers
    for i in "${!headers[@]}"; do
        if [[ "${headers[i]}" == "$name" ]]; then
            col_num=$((i + 1))
            break
        fi
    done
    if [[ -z "${col_num:-}" ]]; then
        return 1
    fi
    awk -F',' -v col="$col_num" 'NR > 1 { print $col }'
}
trial 1 (temp 0.7) — fail — 25
csv_col() {
    local name="$1"
    local col_num
    IFS=',' read -ra headers
    for i in "${!headers[@]}"; do
        if [[ "${headers[i]}" == "$name" ]]; then
            col_num=$((i + 1))
            break
        fi
    done
    if [[ -z "${col_num:-}" ]]; then
        return 1
    fi
    awk -F',' -v col="$col_num" 'NR > 1 { print $col }'
}
trial 2 (temp 0.7) — fail — 25
csv_col() {
    local name="$1"
    local col_num
    IFS=',' read -ra headers
    for i in "${!headers[@]}"; do
        if [[ "${headers[i]}" == "$name" ]]; then
            col_num=$((i + 1))
            break
        fi
    done
    if [[ -z "${col_num:-}" ]]; then
        return 1
    fi
    awk -F',' -v col="$col_num" 'NR > 1 { print $col }'
}

Bash (hard) — 6/9 (0.2 min / 2.1k tok)

find_dupes — 0/3 passed
prompt sent to the model
Implement in bash: `find_dupes <dir>`. Finds groups of regular files under <dir> (recursive) with identical content (compare by MD5). Prints one group per line: space-separated paths, sorted, only groups of 2+ files. Groups sorted by first path. Must work on macOS (BSD userland: no GNU find -printf, no md5sum — use md5 -r).
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — solution.sh: line 8: md5: command not found
find_dupes() {
    local dir="$1"
    local tmp_file
    tmp_file=$(mktemp)
    
    # Find all regular files, compute MD5, store hash and path
    find "$dir" -type f -print0 | while IFS= read -r -d '' file; do
        hash=$(md5 -r "$file" | awk '{print $1}')
        printf '%s\t%s\n' "$hash" "$file"
    done | sort > "$tmp_file"
    
    # Group by hash and output groups with 2+ files
    awk -F'\t' '
    {
        if ($1 == prev_hash) {
            paths[NR] = $2
            count++
        } else {
            if (count >= 2) {
                # Sort paths and print
                n = asorti(paths, sorted_idx)
                for (i = 1; i <= n; i++) {
                    printf "%s%s", paths[sorted_idx[i]], (i < n ? " " : "\n")
                }
            }
            delete paths
            paths[NR] = $2
            prev_hash = $1
            count = 1
        }
    }
    END {
        if (count >= 2) {
            n = asorti(paths, sorted_idx)
            for (i = 1; i <= n; i++) {
                printf "%s%s", paths[sorted_idx[i]], (i < n ? " " : "\n")
            }
        }
    }
    ' "$tmp_file" | sort
    
    rm -f "$tmp_file"
}
trial 1 (temp 0.7) — fail — solution.sh: line 8: md5: command not found
find_dupes() {
    local dir="$1"
    local tmp_file
    tmp_file=$(mktemp)
    
    # Find all regular files, compute MD5, store hash and path
    find "$dir" -type f -print0 | while IFS= read -r -d '' file; do
        hash=$(md5 -r "$file" | awk '{print $1}')
        printf '%s\t%s\n' "$hash" "$file"
    done | sort > "$tmp_file"
    
    # Group by hash and output groups with 2+ files
    awk -F'\t' '
    {
        if ($1 == prev_hash) {
            paths[NR] = $2
            count++
        } else {
            if (count >= 2) {
                # Sort paths and print
                n = asorti(paths, sorted_idx)
                for (i = 1; i <= n; i++) {
                    printf "%s%s", paths[sorted_idx[i]], (i < n ? " " : "\n")
                }
            }
            delete paths
            paths[NR] = $2
            prev_hash = $1
            count = 1
        }
    }
    END {
        if (count >= 2) {
            n = asorti(paths, sorted_idx)
            for (i = 1; i <= n; i++) {
                printf "%s%s", paths[sorted_idx[i]], (i < n ? " " : "\n")
            }
        }
    }
    ' "$tmp_file" | sort
    
    rm -f "$tmp_file"
}
trial 2 (temp 0.7) — fail — solution.sh: line 8: md5: command not found
find_dupes() {
    local dir="$1"
    local tmp_file
    tmp_file=$(mktemp)
    
    # Find all regular files, compute MD5, store hash and path
    find "$dir" -type f -print0 | while IFS= read -r -d '' file; do
        hash=$(md5 -r "$file" | awk '{print $1}')
        printf '%s\t%s\n' "$hash" "$file"
    done | sort > "$tmp_file"
    
    # Group by hash and output groups with 2+ files
    awk -F'\t' '
    {
        if ($1 == prev_hash) {
            paths[NR] = $2
            count++
        } else {
            if (count >= 2) {
                # Sort paths and print
                n = asorti(paths, sorted_idx)
                for (i = 1; i <= n; i++) {
                    printf "%s%s", paths[sorted_idx[i]], (i < n ? " " : "\n")
                }
            }
            delete paths
            paths[NR] = $2
            prev_hash = $1
            count = 1
        }
    }
    END {
        if (count >= 2) {
            n = asorti(paths, sorted_idx)
            for (i = 1; i <= n; i++) {
                printf "%s%s", paths[sorted_idx[i]], (i < n ? " " : "\n")
            }
        }
    }
    ' "$tmp_file" | sort
    
    rm -f "$tmp_file"
}

qwen3.6-27b 79% overall↑ top

Served via llama.cpp CUDA · — tok/s · — GB RAM · coding total 99/126

Bash — 21/24 (0.4 min / 1.8k tok)

extract_urls — 0/3 passed
prompt sent to the model
Implement in bash: `extract_urls`. Reads stdin, prints every http:// or https:// URL found, one per line, in order of appearance. Nothing else.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — test.sh: line 3: extract_urls: command not found
extract_urls() {
    grep -oE 'https?://[^[:space:]"<>()\[\]{}\'\',;!?]*'
}
trial 1 (temp 0.7) — fail — test.sh: line 3: extract_urls: command not found
extract_urls() {
    grep -oE 'https?://[^[:space:]"<>()\[\]{}\'\',;!?]*'
}
trial 2 (temp 0.7) — fail — test.sh: line 3: extract_urls: command not found
extract_urls() {
    grep -oE 'https?://[^[:space:]"<>()\[\]{}\'\',;!?]*'
}

Bash (hard) — 3/9 (0.5 min / 2.5k tok)

find_dupes — 0/3 passed
prompt sent to the model
Implement in bash: `find_dupes <dir>`. Finds groups of regular files under <dir> (recursive) with identical content (compare by MD5). Prints one group per line: space-separated paths, sorted, only groups of 2+ files. Groups sorted by first path. Must work on macOS (BSD userland: no GNU find -printf, no md5sum — use md5 -r).
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — FAIL got:
find_dupes() {
    local dir="$1"
    if [[ -z "$dir" || ! -d "$dir" ]]; then
        return 1
    fi

    # Associative array to map md5 hash to list of files
    declare -A hash_to_files

    # Find all regular files recursively
    while IFS= read -r -d '' file; do
        # Compute MD5 hash using BSD md5 -r (format: hash  filename)
        # We only need the hash part
        local hash
        hash=$(md5 -r "$file" 2>/dev/null | cut -d' ' -f1)
        if [[ -n "$hash" ]]; then
            if [[ -n "${hash_to_files[$hash]}" ]]; then
                hash_to_files[$hash]+=$'\n'"$file"
            else
                hash_to_files[$hash]="$file"
            fi
        fi
    done < <(find "$dir" -type f -print0)

    # Collect groups with 2+ files
    local groups=()
    for hash in "${!hash_to_files[@]}"; do
        local files_str="${hash_to_files[$hash]}"
        # Count number of files (lines)
        local count
        count=$(echo "$files_str" | wc -l | tr -d ' ')
        if [[ "$count" -ge 2 ]]; then
            # Sort the files within the group
            local sorted_files
            sorted_files=$(echo "$files_str" | sort)
            # Join with spaces
            local group_line
            group_line=$(echo "$sorted_files" | tr '\n' ' ' | sed 's/ $//')
            groups+=("$group_line")
        fi
    done

    # Sort groups by first path (which is the first word in each line)
    if [[ ${#groups[@]} -gt 0 ]]; then
        printf '%s\n' "${groups[@]}" | sort -k1,1
    fi
}
trial 1 (temp 0.7) — fail — FAIL got:
find_dupes() {
    local dir="$1"
    if [[ -z "$dir" || ! -d "$dir" ]]; then
        return 1
    fi

    # Associative array to map md5 hash to list of files
    declare -A hash_to_files

    # Find all regular files recursively
    while IFS= read -r -d '' file; do
        # Compute MD5 hash using BSD md5 -r (format: hash  filename)
        # We only need the hash part
        local hash
        hash=$(md5 -r "$file" 2>/dev/null | cut -d' ' -f1)
        if [[ -n "$hash" ]]; then
            if [[ -n "${hash_to_files[$hash]}" ]]; then
                hash_to_files[$hash]+=$'\n'"$file"
            else
                hash_to_files[$hash]="$file"
            fi
        fi
    done < <(find "$dir" -type f -print0)

    # Collect groups with 2+ files
    local groups=()
    for hash in "${!hash_to_files[@]}"; do
        local files_str="${hash_to_files[$hash]}"
        # Count number of files (lines)
        local count
        count=$(echo "$files_str" | wc -l | tr -d ' ')
        if [[ "$count" -ge 2 ]]; then
            # Sort the files within the group
            local sorted_files
            sorted_files=$(echo "$files_str" | sort)
            # Join with spaces
            local group_line
            group_line=$(echo "$sorted_files" | tr '\n' ' ' | sed 's/ $//')
            groups+=("$group_line")
        fi
    done

    # Sort groups by first path (which is the first word in each line)
    if [[ ${#groups[@]} -gt 0 ]]; then
        printf '%s\n' "${groups[@]}" | sort -k1,1
    fi
}
trial 2 (temp 0.7) — fail — FAIL got:
find_dupes() {
    local dir="$1"
    if [[ -z "$dir" || ! -d "$dir" ]]; then
        return 1
    fi

    # Associative array to map md5 hash to list of files
    declare -A hash_to_files

    # Find all regular files recursively
    while IFS= read -r -d '' file; do
        # Compute MD5 hash using BSD md5 -r (format: hash  filename)
        # We only need the hash part
        local hash
        hash=$(md5 -r "$file" 2>/dev/null | cut -d' ' -f1)
        if [[ -n "$hash" ]]; then
            if [[ -n "${hash_to_files[$hash]}" ]]; then
                hash_to_files[$hash]+=$'\n'"$file"
            else
                hash_to_files[$hash]="$file"
            fi
        fi
    done < <(find "$dir" -type f -print0)

    # Collect groups with 2+ files
    local groups=()
    for hash in "${!hash_to_files[@]}"; do
        local files_str="${hash_to_files[$hash]}"
        # Count number of files (lines)
        local count
        count=$(echo "$files_str" | wc -l | tr -d ' ')
        if [[ "$count" -ge 2 ]]; then
            # Sort the files within the group
            local sorted_files
            sorted_files=$(echo "$files_str" | sort)
            # Join with spaces
            local group_line
            group_line=$(echo "$sorted_files" | tr '\n' ' ' | sed 's/ $//')
            groups+=("$group_line")
        fi
    done

    # Sort groups by first path (which is the first word in each line)
    if [[ ${#groups[@]} -gt 0 ]]; then
        printf '%s\n' "${groups[@]}" | sort -k1,1
    fi
}
top_errors — 0/3 passed
prompt sent to the model
Implement in bash: `top_errors <logfile> <n>`. Prints the n most frequent ERROR signatures in <logfile>. A signature is the text after 'ERROR: ' with every run of digits replaced by '#'. Output one per line as '<count> <signature>', sorted by count descending, then signature ascending. Print nothing if there are no ERROR lines.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — 3 #-#-# disk # full
top_errors() {
    local logfile="$1"
    local n="$2"

    if [[ -z "$logfile" || -z "$n" ]]; then
        return
    fi

    if [[ ! -f "$logfile" ]]; then
        return
    fi

    grep 'ERROR: ' "$logfile" | \
        sed 's/ERROR: //' | \
        sed 's/[0-9]\+/#/g' | \
        sort | \
        uniq -c | \
        sort -k1,1nr -k2 | \
        head -n "$n" | \
        sed 's/^ *//'
}
trial 1 (temp 0.7) — fail — 3 #-#-# disk # full
top_errors() {
    local logfile="$1"
    local n="$2"

    if [[ -z "$logfile" || -z "$n" ]]; then
        return
    fi

    if [[ ! -f "$logfile" ]]; then
        return
    fi

    grep 'ERROR: ' "$logfile" | \
        sed 's/ERROR: //' | \
        sed 's/[0-9]\+/#/g' | \
        sort | \
        uniq -c | \
        sort -k1,1nr -k2 | \
        head -n "$n" | \
        sed 's/^ *//'
}
trial 2 (temp 0.7) — fail — 3 #-#-# disk # full
top_errors() {
    local logfile="$1"
    local n="$2"

    if [[ -z "$logfile" || -z "$n" ]]; then
        return
    fi

    if [[ ! -f "$logfile" ]]; then
        return
    fi

    grep 'ERROR: ' "$logfile" | \
        sed 's/ERROR: //' | \
        sed 's/[0-9]\+/#/g' | \
        sort | \
        uniq -c | \
        sort -k1,1nr -k2 | \
        head -n "$n" | \
        sed 's/^ *//'
}

devstral-2 24b 76% overall↑ top

Served via llama.cpp CUDA · — tok/s · — GB RAM · coding total 96/126

Bash — 18/24 (0.2 min / 1.2k tok)

extract_urls — 0/3 passed
prompt sent to the model
Implement in bash: `extract_urls`. Reads stdin, prints every http:// or https:// URL found, one per line, in order of appearance. Nothing else.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]"]+' | sort -u
}
trial 1 (temp 0.7) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]"]+' | sort -u
}
trial 2 (temp 0.7) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]"]+' | sort -u
}
csv_col — 0/3 passed
prompt sent to the model
Implement in bash: `csv_col <name>`. Reads a CSV from stdin (first line is a header). Prints the values of the column named <name>, one per line, in order.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — FAIL got:
csv_col() {
    local -r name="$1"
    local -r header=$(head -n 1)
    local -r col_index=$(echo "$header" | tr ',' '\n' | grep -n "^${name}$" | cut -d: -f1)
    tail -n +2 | while IFS=, read -r -a row; do
        if [ "$col_index" -le "${#row[@]}" ]; then
            echo "${row[$((col_index - 1))]}"
        fi
    done
}
trial 1 (temp 0.7) — fail — FAIL got:
csv_col() {
    local -r name="$1"
    local -r header=$(head -n 1)
    local -r col_index=$(echo "$header" | tr ',' '\n' | grep -n "^${name}$" | cut -d: -f1)
    tail -n +2 | while IFS=, read -r -a row; do
        if [ "$col_index" -le "${#row[@]}" ]; then
            echo "${row[$((col_index - 1))]}"
        fi
    done
}
trial 2 (temp 0.7) — fail — FAIL got:
csv_col() {
    local -r name="$1"
    local -r header=$(head -n 1)
    local -r col_index=$(echo "$header" | tr ',' '\n' | grep -n "^${name}$" | cut -d: -f1)
    tail -n +2 | while IFS=, read -r -a row; do
        if [ "$col_index" -le "${#row[@]}" ]; then
            echo "${row[$((col_index - 1))]}"
        fi
    done
}

Bash (hard) — 6/9 (0.2 min / 1.2k tok)

find_dupes — 0/3 passed
prompt sent to the model
Implement in bash: `find_dupes <dir>`. Finds groups of regular files under <dir> (recursive) with identical content (compare by MD5). Prints one group per line: space-separated paths, sorted, only groups of 2+ files. Groups sorted by first path. Must work on macOS (BSD userland: no GNU find -printf, no md5sum — use md5 -r).
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — find: ‘md5’: No such file or directory
find_dupes() {
    dir="$1"
    find "$dir" -type f -exec md5 -r {} + | sort -k1,1 -k2,2 | uniq -w32 -d --all-repeated=prepend | awk '{print $2}' | sort -k1,1 | while read -r line; do
        paths=$(echo "$line" | sed 's/ .*//')
        count=$(echo "$line" | wc -w)
        if [ "$count" -ge 2 ]; then
            echo "$line"
        fi
    done
}
trial 1 (temp 0.7) — fail — find: ‘md5’: No such file or directory
find_dupes() {
    dir="$1"
    find "$dir" -type f -exec md5 -r {} + | sort -k1,1 -k2,2 | uniq -w32 -d --all-repeated=prepend | awk '{print $2}' | sort -k1,1 | while read -r line; do
        paths=$(echo "$line" | sed 's/ .*//')
        count=$(echo "$line" | wc -w)
        if [ "$count" -ge 2 ]; then
            echo "$line"
        fi
    done
}
trial 2 (temp 0.7) — fail — find: ‘md5’: No such file or directory
find_dupes() {
    dir="$1"
    find "$dir" -type f -exec md5 -r {} + | sort -k1,1 -k2,2 | uniq -w32 -d --all-repeated=prepend | awk '{print $2}' | sort -k1,1 | while read -r line; do
        paths=$(echo "$line" | sed 's/ .*//')
        count=$(echo "$line" | wc -w)
        if [ "$count" -ge 2 ]; then
            echo "$line"
        fi
    done
}

qwen3.6-35b 76% overall↑ top

Served via llama.cpp CUDA · — tok/s · — GB RAM · coding total 96/126

Bash — 18/24 (0.1 min / 1.9k tok)

count_matches — 0/3 passed
prompt sent to the model
Implement in bash: `count_matches <pattern> <file>`. Prints the number of lines in <file> matching <pattern> (fixed string). Prints 0 when nothing matches.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — FAIL count foo
count_matches() {
    local pattern="$1"
    local file="$2"
    grep -c -F -x "$pattern" "$file" 2>/dev/null || echo 0
}
trial 1 (temp 0.7) — fail — FAIL count foo
count_matches() {
    local pattern="$1"
    local file="$2"
    grep -c -F -x "$pattern" "$file" 2>/dev/null || echo 0
}
trial 2 (temp 0.7) — fail — FAIL count foo
count_matches() {
    local pattern="$1"
    local file="$2"
    grep -c -F -x "$pattern" "$file" 2>/dev/null || echo 0
}
extract_urls — 0/3 passed
prompt sent to the model
Implement in bash: `extract_urls`. Reads stdin, prints every http:// or https:// URL found, one per line, in order of appearance. Nothing else.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]]+'
}
trial 1 (temp 0.7) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]]+'
}
trial 2 (temp 0.7) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]]+'
}

Bash (hard) — 3/9 (0.2 min / 2.4k tok)

find_dupes — 0/3 passed
prompt sent to the model
Implement in bash: `find_dupes <dir>`. Finds groups of regular files under <dir> (recursive) with identical content (compare by MD5). Prints one group per line: space-separated paths, sorted, only groups of 2+ files. Groups sorted by first path. Must work on macOS (BSD userland: no GNU find -printf, no md5sum — use md5 -r).
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — FAIL got:
find_dupes() {
    local dir="${1:-.}"
    
    # Find all regular files, compute md5, sort by md5 then path
    # Use find to get files, then md5 -r to hash them
    # md5 -r output format: "hash  filename"
    
    find "$dir" -type f -exec md5 -r {} + 2>/dev/null | \
    awk '{
        # md5 -r outputs: hash  filename (two spaces)
        # We need to extract hash and filename
        hash = $1
        # The filename starts after the first two spaces
        # In awk, $2 is the filename if there are no spaces in names, but find paths might have spaces
        # Actually, md5 -r output is: "hash  filename"
        # So we can reconstruct filename from $2 onwards
        fname = ""
        for (i=2; i<=NF; i++) {
            if (i==2) fname = $i
            else fname = fname " " $i
        }
        print hash "\t" fname
    }' | \
    sort -t$'\t' -k1,1 -k2,2 | \
    awk -F'\t' '
    {
        hash = $1
        path = $2
        if (hash == prev_hash) {
            group = group " " path
            count++
        } else {
            if (count >= 2) {
                print group
            }
            prev_hash = hash
            group = path
            count = 1
        }
    }
    END {
        if (count >= 2) {
            print group
        }
    }'
}
trial 1 (temp 0.7) — fail — FAIL got:
find_dupes() {
    local dir="${1:-.}"
    
    # Find all regular files, compute md5, sort by md5 then path
    # Use find to get files, then md5 -r to hash them
    # md5 -r output format: "hash  filename"
    
    find "$dir" -type f -exec md5 -r {} + 2>/dev/null | \
    awk '{
        # md5 -r outputs: hash  filename (two spaces)
        # We need to extract hash and filename
        hash = $1
        # The filename starts after the first two spaces
        # In awk, $2 is the filename if there are no spaces in names, but find paths might have spaces
        # Actually, md5 -r output is: "hash  filename"
        # So we can reconstruct filename from $2 onwards
        fname = ""
        for (i=2; i<=NF; i++) {
            if (i==2) fname = $i
            else fname = fname " " $i
        }
        print hash "\t" fname
    }' | \
    sort -t$'\t' -k1,1 -k2,2 | \
    awk -F'\t' '
    {
        hash = $1
        path = $2
        if (hash == prev_hash) {
            group = group " " path
            count++
        } else {
            if (count >= 2) {
                print group
            }
            prev_hash = hash
            group = path
            count = 1
        }
    }
    END {
        if (count >= 2) {
            print group
        }
    }'
}
trial 2 (temp 0.7) — fail — FAIL got:
find_dupes() {
    local dir="${1:-.}"
    
    # Find all regular files, compute md5, sort by md5 then path
    # Use find to get files, then md5 -r to hash them
    # md5 -r output format: "hash  filename"
    
    find "$dir" -type f -exec md5 -r {} + 2>/dev/null | \
    awk '{
        # md5 -r outputs: hash  filename (two spaces)
        # We need to extract hash and filename
        hash = $1
        # The filename starts after the first two spaces
        # In awk, $2 is the filename if there are no spaces in names, but find paths might have spaces
        # Actually, md5 -r output is: "hash  filename"
        # So we can reconstruct filename from $2 onwards
        fname = ""
        for (i=2; i<=NF; i++) {
            if (i==2) fname = $i
            else fname = fname " " $i
        }
        print hash "\t" fname
    }' | \
    sort -t$'\t' -k1,1 -k2,2 | \
    awk -F'\t' '
    {
        hash = $1
        path = $2
        if (hash == prev_hash) {
            group = group " " path
            count++
        } else {
            if (count >= 2) {
                print group
            }
            prev_hash = hash
            group = path
            count = 1
        }
    }
    END {
        if (count >= 2) {
            print group
        }
    }'
}
top_errors — 0/3 passed
prompt sent to the model
Implement in bash: `top_errors <logfile> <n>`. Prints the n most frequent ERROR signatures in <logfile>. A signature is the text after 'ERROR: ' with every run of digits replaced by '#'. Output one per line as '<count> <signature>', sorted by count descending, then signature ascending. Print nothing if there are no ERROR lines.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — 2 disk
top_errors() {
    local logfile="$1"
    local n="$2"

    if [[ ! -f "$logfile" ]]; then
        return
    fi

    # Extract ERROR signatures, replace digits with #, count, sort, and print top n
    grep -oP 'ERROR: \K.*' "$logfile" 2>/dev/null | \
        sed 's/[0-9]/#/g' | \
        sort | \
        uniq -c | \
        sort -k1,1nr -k2,2 | \
        head -n "$n" | \
        awk '{print $1, $2}'
}
trial 1 (temp 0.7) — fail — 2 disk
top_errors() {
    local logfile="$1"
    local n="$2"

    if [[ ! -f "$logfile" ]]; then
        return
    fi

    # Extract ERROR signatures, replace digits with #, count, sort, and print top n
    grep -oP 'ERROR: \K.*' "$logfile" 2>/dev/null | \
        sed 's/[0-9]/#/g' | \
        sort | \
        uniq -c | \
        sort -k1,1nr -k2,2 | \
        head -n "$n" | \
        awk '{print $1, $2}'
}
trial 2 (temp 0.7) — fail — 2 disk
top_errors() {
    local logfile="$1"
    local n="$2"

    if [[ ! -f "$logfile" ]]; then
        return
    fi

    # Extract ERROR signatures, replace digits with #, count, sort, and print top n
    grep -oP 'ERROR: \K.*' "$logfile" 2>/dev/null | \
        sed 's/[0-9]/#/g' | \
        sort | \
        uniq -c | \
        sort -k1,1nr -k2,2 | \
        head -n "$n" | \
        awk '{print $1, $2}'
}

glm-4.7-flash 75% overall↑ top

Served via llama.cpp CUDA · — tok/s · — GB RAM · coding total 94/126

Bash — 15/24 (0.2 min / 2.1k tok)

count_matches — 0/3 passed
prompt sent to the model
Implement in bash: `count_matches <pattern> <file>`. Prints the number of lines in <file> matching <pattern> (fixed string). Prints 0 when nothing matches.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — FAIL count zzz
count_matches() {
    local pattern="$1"
    local file="$2"
    grep -F -c "$pattern" "$file" 2>/dev/null || echo 0
}
trial 1 (temp 0.7) — fail — FAIL count zzz
count_matches() {
    local pattern="$1"
    local file="$2"
    grep -F -c "$pattern" "$file" 2>/dev/null || echo 0
}
trial 2 (temp 0.7) — fail — FAIL count zzz
count_matches() {
    local pattern="$1"
    local file="$2"
    grep -F -c "$pattern" "$file" 2>/dev/null || echo 0
}
retry3 — 0/3 passed
prompt sent to the model
Implement in bash: `retry3 <cmd...>`. Runs the command; if it fails, retries up to 3 total attempts. Exits 0 if any attempt succeeds, otherwise exits with the last attempt's exit code.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — FAIL false succeeded
retry3() {
    local attempts=0
    local max_attempts=3
    local exit_code=0

    while [ $attempts -lt $max_attempts ]; do
        if "$@"; then
            return 0
        fi
        exit_code=$?
        attempts=$((attempts + 1))
        if [ $attempts -lt $max_attempts ]; then
            sleep 1
        fi
    done

    return $exit_code
}
trial 1 (temp 0.7) — fail — FAIL false succeeded
retry3() {
    local attempts=0
    local max_attempts=3
    local exit_code=0

    while [ $attempts -lt $max_attempts ]; do
        if "$@"; then
            return 0
        fi
        exit_code=$?
        attempts=$((attempts + 1))
        if [ $attempts -lt $max_attempts ]; then
            sleep 1
        fi
    done

    return $exit_code
}
trial 2 (temp 0.7) — fail — FAIL false succeeded
retry3() {
    local attempts=0
    local max_attempts=3
    local exit_code=0

    while [ $attempts -lt $max_attempts ]; do
        if "$@"; then
            return 0
        fi
        exit_code=$?
        attempts=$((attempts + 1))
        if [ $attempts -lt $max_attempts ]; then
            sleep 1
        fi
    done

    return $exit_code
}
extract_urls — 0/3 passed
prompt sent to the model
Implement in bash: `extract_urls`. Reads stdin, prints every http:// or https:// URL found, one per line, in order of appearance. Nothing else.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]]+' | sort -u
}
trial 1 (temp 0.7) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]]+' | sort -u
}
trial 2 (temp 0.7) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]]+' | sort -u
}

Bash (hard) — 1/9 (0.2 min / 2.8k tok)

find_dupes — 0/3 passed
prompt sent to the model
Implement in bash: `find_dupes <dir>`. Finds groups of regular files under <dir> (recursive) with identical content (compare by MD5). Prints one group per line: space-separated paths, sorted, only groups of 2+ files. Groups sorted by first path. Must work on macOS (BSD userland: no GNU find -printf, no md5sum — use md5 -r).
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — find: ‘md5’: No such file or directory
find_dupes() {
    local dir="$1"
    local temp_file=$(mktemp)
    local temp_list=$(mktemp)

    # Generate MD5 hashes for all regular files recursively
    find "$dir" -type f -exec md5 -r {} + | awk '{print $1, $2}' > "$temp_file"

    # Sort by hash, then by filename to group identical files together
    sort "$temp_file" > "$temp_list"

    # Iterate through sorted list, grouping files with identical hashes
    local prev_hash=""
    local current_group=""
    local first_path=""

    while IFS=' ' read -r hash path; do
        if [[ "$hash" == "$prev_hash" ]]; then
            # Add to current group
            current_group="$current_group $path"
        else
            # If we have a previous group, print it if it has 2+ files
            if [[ -n "$current_group" ]]; then
                if [[ $(echo "$current_group" | wc -w) -ge 2 ]]; then
                    echo "$first_path$current_group"
                fi
            fi
            # Start new group
            prev_hash="$hash"
            current_group="$path"
            first_path="$path"
        fi
    done < "$temp_list"

    # Handle the last group
    if [[ -n "$current_group" ]]; then
        if [[ $(echo "$current_group" | wc -w) -ge 2 ]]; then
            echo "$first_path$current_group"
        fi
    fi

    # Cleanup
    rm -f "$temp_file" "$temp_list"
}
trial 1 (temp 0.7) — fail — find: ‘md5’: No such file or directory
find_dupes() {
    local dir="$1"
    local temp_file=$(mktemp)
    local temp_list=$(mktemp)

    # Generate MD5 hashes for all regular files recursively
    find "$dir" -type f -exec md5 -r {} + | awk '{print $1, $2}' > "$temp_file"

    # Sort by hash, then by filename to group identical files together
    sort "$temp_file" > "$temp_list"

    # Iterate through sorted list, grouping files with identical hashes
    local prev_hash=""
    local current_group=""
    local first_path=""

    while IFS=' ' read -r hash path; do
        if [ "$hash" = "$prev_hash" ]; then
            # Add to current group
            current_group="$current_group $path"
        else
            # If we have a previous group, check if it has more than 1 file
            if [ -n "$current_group" ]; then
                if [ $(echo "$current_group" | wc -w) -gt 1 ]; then
                    # Sort the group paths and print
                    echo "$current_group" | tr ' ' '\n' | sort | tr '\n' ' ' | sed 's/ $//'
                    echo
                fi
            fi
            # Start new group
            prev_hash="$hash"
            current_group="$path"
            first_path="$path"
        fi
    done < "$temp_list"

    # Handle the last group
    if [ -n "$current_group" ]; then
        if [ $(echo "$current_group" | wc -w) -gt 1 ]; then
            echo "$current_group" | tr ' ' '\n' | sort | tr '\n' ' ' | sed 's/ $//'
            echo
        fi
    fi

    # Cleanup
    rm "$temp_file" "$temp_list"
}
trial 2 (temp 0.7) — fail — find: ‘md5’: No such file or directory
find_dupes() {
    local dir="$1"
    local temp_file=$(mktemp)
    local temp_list=$(mktemp)

    # Generate MD5 hashes for all regular files recursively
    find "$dir" -type f -exec md5 -r {} + | awk '{print $1, $2}' > "$temp_file"

    # Sort by hash, then by filename to group identical files together
    sort "$temp_file" > "$temp_list"

    # Iterate through sorted list, grouping files with identical hashes
    local prev_hash=""
    local current_group=""
    local first_path=""

    while IFS=' ' read -r hash path; do
        if [ "$hash" = "$prev_hash" ]; then
            # Add to current group
            current_group="$current_group $path"
        else
            # If we have a previous group, check if it has more than 1 file
            if [ -n "$current_group" ]; then
                if [ $(echo "$current_group" | wc -w) -gt 1 ]; then
                    # Sort the group paths and print
                    echo "$current_group" | tr ' ' '\n' | sort | tr '\n' ' ' | sed 's/ $//'
                    echo
                fi
            fi
            # Start new group
            prev_hash="$hash"
            current_group="$path"
            first_path="$path"
        fi
    done < "$temp_list"

    # Handle the last group
    if [ -n "$current_group" ]; then
        if [ $(echo "$current_group" | wc -w) -gt 1 ]; then
            echo "$current_group" | tr ' ' '\n' | sort | tr '\n' ' ' | sed 's/ $//'
            echo
        fi
    fi

    # Cleanup
    rm "$temp_file" "$temp_list"
}
top_errors — 0/3 passed
prompt sent to the model
Implement in bash: `top_errors <logfile> <n>`. Prints the n most frequent ERROR signatures in <logfile>. A signature is the text after 'ERROR: ' with every run of digits replaced by '#'. Output one per line as '<count> <signature>', sorted by count descending, then signature ascending. Print nothing if there are no ERROR lines.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — disk # full 3
top_errors() {
    local logfile="$1"
    local n="$2"
    
    awk -v n="$n" '
    BEGIN { count = 0; }
    /ERROR: / {
        # Extract text after "ERROR: " and replace digits with #
        sig = substr($0, index($0, "ERROR: ") + 7);
        gsub(/[0-9]+/, "#", sig);
        
        # Store signature and count
        sigs[sig] = sigs[sig] + 1;
        count++;
    }
    END {
        # Sort signatures by count descending, then signature ascending
        for (sig in sigs) {
            printf "%s %d\n", sig, sigs[sig];
        } 
        # Sort the array
        asort(sigs, sorted_sigs);
        
        # Print top n results
        for (i = count; i > count - n && i > 0; i--) {
            print sorted_sigs[i] " " sigs[sorted_sigs[i]];
        }
    }
    ' "$logfile"
}
trial 1 (temp 0.7) — fail — disk # full 3
top_errors() {
    local logfile="$1"
    local n="$2"
    
    awk -v n="$n" '
    BEGIN { count = 0; }
    /ERROR: / {
        # Extract text after "ERROR: " and replace digits with #
        sig = substr($0, index($0, "ERROR: ") + 7);
        gsub(/[0-9]+/, "#", sig);
        
        # Store signature and count
        sigs[count] = sig;
        counts[count] = 1;
        
        # Update count
        count++;
    }
    END {
        # Sort by count descending, then signature ascending
        for (i = 0; i < count; i++) {
            for (j = i + 1; j < count; j++) {
                if (counts[i] < counts[j] || (counts[i] == counts[j] && sigs[i] > sigs[j])) {
                    # Swap
                    temp = sigs[i];
                    sigs[i] = sigs[j];
                    sigs[j] = temp;
                    
                    temp = counts[i];
                    counts[i] = counts[j];
                    counts[j] = temp;
                }
            }
        }
        
        # Print top n
        for (i = 0; i < count && i < n; i++) {
            print counts[i] " " sigs[i];
        }
    }
    ' "$logfile"
}
trial 2 (temp 0.7) — fail — disk # full 3
top_errors() {
    local logfile="$1"
    local n="$2"
    
    awk -v n="$n" '
    BEGIN { count = 0; }
    /ERROR: / {
        # Extract text after "ERROR: " and replace digits with #
        sig = substr($0, index($0, "ERROR: ") + 7);
        gsub(/[0-9]+/, "#", sig);
        
        # Store signature and count
        sigs[count] = sig;
        counts[count] = 1;
        
        # Update count
        count++;
    }
    END {
        # Sort by count descending, then signature ascending
        for (i = 0; i < count; i++) {
            for (j = i + 1; j < count; j++) {
                if (counts[i] < counts[j] || (counts[i] == counts[j] && sigs[i] > sigs[j])) {
                    # Swap
                    temp = sigs[i];
                    sigs[i] = sigs[j];
                    sigs[j] = temp;
                    
                    temp = counts[i];
                    counts[i] = counts[j];
                    counts[j] = temp;
                }
            }
        }
        
        # Print top n
        for (i = 0; i < count && i < n; i++) {
            print counts[i] " " sigs[i];
        }
    }
    ' "$logfile"
}
backup_rotate — 1/3 passed
prompt sent to the model
Implement in bash: `backup_rotate <dir> <keep>`. In <dir>, deletes all but the <keep> newest files matching backup-*.tar.gz (newest = lexicographically greatest names). Prints each deleted file's name (not path), one per line, oldest first. Deletes nothing if there are <= <keep> backups (prints nothing).
Reply with only a bash code block defining the function. No tests, no explanation.
trial 1 (temp 0.7) — fail — backup-20260103-120000.tar.gz
backup_rotate() {
    local dir="$1"
    local keep="$2"
    local pattern="backup-*.tar.gz"
    local files=()

    # Find files matching the pattern and sort them lexicographically (newest first)
    while IFS= read -r -d '' file; do
        files+=("$file")
    done < <(find "$dir" -maxdepth 1 -type f -name "$pattern" -print0 | sort -z)

    # If we have fewer or equal files than keep, do nothing
    if (( ${#files[@]} <= keep )); then
        return
    fi

    # Calculate how many files to delete
    local delete_count=$(( ${#files[@]} - keep ))

    # Print the oldest files (last in the array) one per line
    for (( i=0; i<delete_count; i++ )); do
        local file="${files[$(( ${#files[@]} - 1 - i ))]}"
        # Extract just the filename from the full path
        local filename=$(basename "$file")
        echo "$filename"
    done

    # Delete the files
    for (( i=0; i<delete_count; i++ )); do
        local file="${files[$(( ${#files[@]} - 1 - i ))]}"
        rm "$file"
    done
}
trial 2 (temp 0.7) — fail — backup-20260103-120000.tar.gz
backup_rotate() {
    local dir="$1"
    local keep="$2"
    local pattern="backup-*.tar.gz"
    local files=()

    # Find files matching the pattern and sort them lexicographically (newest first)
    while IFS= read -r -d '' file; do
        files+=("$file")
    done < <(find "$dir" -maxdepth 1 -type f -name "$pattern" -print0 | sort -z)

    # If we have fewer or equal files than keep, do nothing
    if (( ${#files[@]} <= keep )); then
        return
    fi

    # Calculate how many files to delete
    local delete_count=$(( ${#files[@]} - keep ))

    # Print the oldest files (last in the array) one per line
    for (( i=0; i<delete_count; i++ )); do
        local file="${files[$(( ${#files[@]} - 1 - i ))]}"
        # Extract just the filename from the full path
        local filename=$(basename "$file")
        echo "$filename"
    done

    # Delete the files
    for (( i=0; i<delete_count; i++ )); do
        local file="${files[$(( ${#files[@]} - 1 - i ))]}"
        rm "$file"
    done
}

qwen3-coder-30b 74% overall↑ top

Served via llama.cpp CUDA · — tok/s · — GB RAM · coding total 93/126

Bash — 12/24 (0.1 min / 1.7k tok)

count_matches — 0/3 passed
prompt sent to the model
Implement in bash: `count_matches <pattern> <file>`. Prints the number of lines in <file> matching <pattern> (fixed string). Prints 0 when nothing matches.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — FAIL count foo
count_matches() {
    local pattern="$1"
    local file="$2"
    
    if [[ -f "$file" ]]; then
        grep -c "^$pattern$" "$file" 2>/dev/null || echo 0
    else
        echo 0
    fi
}
trial 1 (temp 0.7) — fail — FAIL count foo
count_matches() {
    local pattern="$1"
    local file="$2"
    
    if [[ -f "$file" ]]; then
        grep -c "^$pattern$" "$file" 2>/dev/null || echo 0
    else
        echo 0
    fi
}
trial 2 (temp 0.7) — fail — FAIL count foo
count_matches() {
    local pattern="$1"
    local file="$2"
    
    if [[ -f "$file" ]]; then
        grep -c "^$pattern$" "$file" 2>/dev/null || echo 0
    else
        echo 0
    fi
}
extract_urls — 0/3 passed
prompt sent to the model
Implement in bash: `extract_urls`. Reads stdin, prints every http:// or https:// URL found, one per line, in order of appearance. Nothing else.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]]+' | grep -vE '^[^/]*$'
}
trial 1 (temp 0.7) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]]+' | grep -vE '^[^/]*$'
}
trial 2 (temp 0.7) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]]+' | grep -vE '^[^/]*$'
}
rotate — 0/3 passed
prompt sent to the model
Implement in bash: `rotate <file>`. Rotates logs one level: <file>.1 becomes <file>.2, then <file> becomes <file>.1. If <file>.1 does not exist, just rename <file> to <file>.1.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — cat: log.2: No such file or directory
rotate() {
    local file="$1"
    local backup="${file}.1"
    
    if [[ -f "$backup" ]]; then
        local i=9
        while [[ $i -gt 1 ]]; do
            local src="${file}.${i-1}"
            local dst="${file}.${i}"
            if [[ -f "$src" ]]; then
                mv "$src" "$dst"
            fi
            ((i--))
        done
        mv "$file" "${file}.1"
    else
        mv "$file" "${file}.1"
    fi
}
trial 1 (temp 0.7) — fail — cat: log.2: No such file or directory
rotate() {
    local file="$1"
    local backup="${file}.1"
    
    if [[ -f "$backup" ]]; then
        local i=9
        while [[ $i -gt 1 ]]; do
            local src="${file}.${i-1}"
            local dst="${file}.${i}"
            if [[ -f "$src" ]]; then
                mv "$src" "$dst"
            fi
            ((i--))
        done
        mv "$file" "${file}.1"
    else
        mv "$file" "${file}.1"
    fi
}
trial 2 (temp 0.7) — fail — cat: log.2: No such file or directory
rotate() {
    local file="$1"
    local backup="${file}.1"
    
    if [[ -f "$backup" ]]; then
        local i=9
        while [[ $i -gt 1 ]]; do
            local src="${file}.${i-1}"
            local dst="${file}.${i}"
            if [[ -f "$src" ]]; then
                mv "$src" "$dst"
            fi
            ((i--))
        done
        mv "$file" "${file}.1"
    else
        mv "$file" "${file}.1"
    fi
}
csv_col — 0/3 passed
prompt sent to the model
Implement in bash: `csv_col <name>`. Reads a CSV from stdin (first line is a header). Prints the values of the column named <name>, one per line, in order.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — FAIL got:
csv_col() {
    local col_name="$1"
    local col_num=$(head -n1 | tr ',' '\n' | grep -n "^$col_name$" | cut -d: -f1)
    if [ -z "$col_num" ]; then
        return 1
    fi
    cut -d',' -f"$col_num" | tail -n +2
}
trial 1 (temp 0.7) — fail — FAIL got:
csv_col() {
    local col_name="$1"
    local col_num=$(head -n1 | tr ',' '\n' | grep -n "^$col_name$" | cut -d: -f1)
    if [ -z "$col_num" ]; then
        return 1
    fi
    cut -d',' -f"$col_num" | tail -n +2
}
trial 2 (temp 0.7) — fail — FAIL got:
csv_col() {
    local col_name="$1"
    local col_num=$(head -n1 | tr ',' '\n' | grep -n "^$col_name$" | cut -d: -f1)
    if [ -z "$col_num" ]; then
        return 1
    fi
    cut -d',' -f"$col_num" | tail -n +2
}

Bash (hard) — 3/9 (0.1 min / 1.6k tok)

find_dupes — 0/3 passed
prompt sent to the model
Implement in bash: `find_dupes <dir>`. Finds groups of regular files under <dir> (recursive) with identical content (compare by MD5). Prints one group per line: space-separated paths, sorted, only groups of 2+ files. Groups sorted by first path. Must work on macOS (BSD userland: no GNU find -printf, no md5sum — use md5 -r).
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — FAIL got:
find_dupes() {
    local dir="$1"
    local temp_file
    temp_file=$(mktemp)
    
    find "$dir" -type f -exec md5 -r {} \; 2>/dev/null | sort > "$temp_file"
    
    awk '{
        if ($0 == prev) {
            if (first == "") first = prev_file
            dupes = dupes " " $2
        } else {
            if (first != "") {
                if (dupes != "") {
                    printf "%s%s\n", first, dupes
                }
                first = ""
                dupes = ""
            }
            prev = $0
            prev_file = $2
        }
    }
    END {
        if (first != "") {
            if (dupes != "") {
                printf "%s%s\n", first, dupes
            }
        }
    }' "$temp_file" | sort
    
    rm -f "$temp_file"
}
trial 1 (temp 0.7) — fail — FAIL got:
find_dupes() {
    local dir="$1"
    local temp_file
    temp_file=$(mktemp)
    
    find "$dir" -type f -exec md5 -r {} \; 2>/dev/null | sort > "$temp_file"
    
    awk '{
        if ($0 == prev) {
            if (first == "") first = prev_file
            dupes = dupes " " $2
        } else {
            if (first != "") {
                printf "%s%s\n", first, dupes
                first = ""
            }
            dupes = " " $2
            prev = $0
            prev_file = $2
        }
    }
    END {
        if (first != "") {
            printf "%s%s\n", first, dupes
        }
    }' "$temp_file" | sort
    
    rm -f "$temp_file"
}
trial 2 (temp 0.7) — fail — FAIL got:
find_dupes() {
    local dir="$1"
    local temp_file
    temp_file=$(mktemp)
    
    find "$dir" -type f -exec md5 -r {} \; 2>/dev/null | sort > "$temp_file"
    
    awk '{
        if ($0 == prev) {
            if (first == "") first = prev_file
            dupes = dupes " " $2
        } else {
            if (first != "") {
                printf "%s%s\n", first, dupes
                first = ""
            }
            dupes = " " $2
            prev = $0
            prev_file = $2
        }
    }
    END {
        if (first != "") {
            printf "%s%s\n", first, dupes
        }
    }' "$temp_file" | sort
    
    rm -f "$temp_file"
}
top_errors — 0/3 passed
prompt sent to the model
Implement in bash: `top_errors <logfile> <n>`. Prints the n most frequent ERROR signatures in <logfile>. A signature is the text after 'ERROR: ' with every run of digits replaced by '#'. Output one per line as '<count> <signature>', sorted by count descending, then signature ascending. Print nothing if there are no ERROR lines.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — FAIL top1 got:
top_errors() {
    local logfile="$1"
    local n="$2"
    
    if [[ ! -f "$logfile" ]]; then
        return
    fi
    
    grep '^ERROR: ' "$logfile" | \
    sed 's/^ERROR: //; s/[0-9]\+/#/g' | \
    sort | \
    uniq -c | \
    sort -k1,1nr -k2,2 | \
    head -n "$n" | \
    while read count signature; do
        echo "$count $signature"
    done
}
trial 1 (temp 0.7) — fail — FAIL top1 got:
top_errors() {
    local logfile="$1"
    local n="$2"
    
    if [[ ! -f "$logfile" ]]; then
        return
    fi
    
    grep '^ERROR: ' "$logfile" | \
    sed 's/^ERROR: //; s/[0-9]\+/#/g' | \
    sort | \
    uniq -c | \
    sort -k1,1nr -k2,2 | \
    head -n "$n" | \
    while read count signature; do
        echo "$count $signature"
    done
}
trial 2 (temp 0.7) — fail — FAIL top1 got:
top_errors() {
    local logfile="$1"
    local n="$2"
    
    if [[ ! -f "$logfile" ]]; then
        return
    fi
    
    grep '^ERROR: ' "$logfile" | \
    sed 's/^ERROR: //; s/[0-9]\+/#/g' | \
    sort | \
    uniq -c | \
    sort -k1,1nr -k2,2 | \
    head -n "$n" | \
    while read count signature; do
        echo "$count $signature"
    done
}

qwen3.5-122b-a10b 74% overall↑ top

Served via llama.cpp CUDA · — tok/s · — GB RAM · coding total 93/126

Bash — 18/24 (0.3 min / 2.2k tok)

count_matches — 0/3 passed
prompt sent to the model
Implement in bash: `count_matches <pattern> <file>`. Prints the number of lines in <file> matching <pattern> (fixed string). Prints 0 when nothing matches.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — FAIL count zzz
count_matches() {
    local pattern="$1"
    local file="$2"
    grep -F -c "$pattern" "$file" 2>/dev/null || echo 0
}
trial 1 (temp 0.7) — fail — FAIL count zzz
count_matches() {
    local pattern="$1"
    local file="$2"
    grep -F -c "$pattern" "$file" 2>/dev/null || echo 0
}
trial 2 (temp 0.7) — fail — FAIL count zzz
count_matches() {
    local pattern="$1"
    local file="$2"
    grep -F -c "$pattern" "$file" 2>/dev/null || echo 0
}
extract_urls — 0/3 passed
prompt sent to the model
Implement in bash: `extract_urls`. Reads stdin, prints every http:// or https:// URL found, one per line, in order of appearance. Nothing else.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]<>"'\'']+'
}
trial 1 (temp 0.7) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]<>"'\'']+'
}
trial 2 (temp 0.7) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]<>"'\'']+'
}

Bash (hard) — 3/9 (0.5 min / 3.5k tok)

find_dupes — 0/3 passed
prompt sent to the model
Implement in bash: `find_dupes <dir>`. Finds groups of regular files under <dir> (recursive) with identical content (compare by MD5). Prints one group per line: space-separated paths, sorted, only groups of 2+ files. Groups sorted by first path. Must work on macOS (BSD userland: no GNU find -printf, no md5sum — use md5 -r).
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — FAIL got:
find_dupes() {
    local dir="$1"
    if [[ -z "$dir" ]]; then
        echo "Usage: find_dupes <dir>" >&2
        return 1
    fi

    local tmpfile
    tmpfile=$(mktemp)
    trap 'rm -f "$tmpfile"' EXIT

    # Find regular files, compute MD5, format as "hash  path"
    # Using 'md5 -r' for BSD/macOS compatibility
    find "$dir" -type f -exec sh -c '
        for f do
            hash=$(md5 -r "$f" 2>/dev/null | cut -d" " -f1)
            if [ -n "$hash" ]; then
                printf "%s  %s\n" "$hash" "$f"
            fi
        done
    ' sh {} + > "$tmpfile"

    # Sort by hash, then by path to group duplicates and ensure consistent ordering within groups
    sort -k1,1 -k2 "$tmpfile" | awk '
    {
        hash = $1
        # Reconstruct path (in case path contains spaces, though find_dupes usually implies simple paths or we handle them)
        # The format from md5 -r is "hash  filename", so $2 is the start of the path.
        # We need to capture the rest of the line as the path.
        path = ""
        for (i = 2; i <= NF; i++) {
            if (i == 2) path = $i
            else path = path " " $i
        }

        if (hash == prev_hash) {
            group = group " " path
            count++
        } else {
            if (count >= 2) {
                # Sort the paths within the group
                n = split(group, arr, " ")
                # Simple bubble sort for paths within the group
                for (i = 1; i <= n; i++) {
                    for (j = i + 1; j <= n; j++) {
                        if (arr[i] > arr[j]) {
                            tmp = arr[i]
                            arr[i] = arr[j]
                            arr[j] = tmp
                        }
                    }
                }
                # Rebuild sorted group string
                sorted_group = arr[1]
                for (i = 2; i <= n; i++) {
                    sorted_group = sorted_group " " arr[i]
                }
                print sorted_group
            }
            prev_hash = hash
            group = path
            count = 1
        }
    }
    END {
        if (count >= 2) {
            n = split(group, arr, " ")
            for (i = 1; i <= n; i++) {
                for (j = i + 1; j <= n; j++) {
                    if (arr[i] > arr[j]) {
                        tmp = arr[i]
                        arr[i] = arr[j]
                        arr[j] = tmp
                    }
                }
            }
            sorted_group = arr[1]
            for (i = 2; i <= n; i++) {
                sorted_group = sorted_group " " arr[i]
            }
            print sorted_group
        }
    }
    ' | sort -k1,1
}
trial 1 (temp 0.7) — fail — FAIL got:
find_dupes() {
    local dir="$1"
    if [[ -z "$dir" ]]; then
        echo "Usage: find_dupes <dir>" >&2
        return 1
    fi

    local tmpfile
    tmpfile=$(mktemp)
    trap 'rm -f "$tmpfile"' EXIT

    # Find regular files, compute MD5, format as "hash  path"
    # Using 'md5 -r' for BSD/macOS compatibility
    find "$dir" -type f -exec sh -c '
        for f do
            hash=$(md5 -r "$f" 2>/dev/null | cut -d" " -f1)
            if [ -n "$hash" ]; then
                printf "%s  %s\n" "$hash" "$f"
            fi
        done
    ' sh {} + > "$tmpfile"

    # Sort by hash, then by path to group duplicates and ensure consistent ordering within groups
    sort -k1,1 -k2 "$tmpfile" | awk '
    {
        hash = $1
        # Reconstruct path (in case path contains spaces, though find_dupes usually implies simple paths or we handle them)
        # The format from md5 -r is "hash  filename", so $2 is the start of the path.
        # We need to capture the rest of the line as the path.
        path = ""
        for (i = 2; i <= NF; i++) {
            if (i == 2) path = $i
            else path = path " " $i
        }

        if (hash == prev_hash) {
            group = group " " path
            count++
        } else {
            if (count >= 2) {
                # Sort the paths within the group
                n = split(group, arr, " ")
                # Simple bubble sort for paths within the group
                for (i = 1; i <= n; i++) {
                    for (j = i + 1; j <= n; j++) {
                        if (arr[i] > arr[j]) {
                            tmp = arr[i]
                            arr[i] = arr[j]
                            arr[j] = tmp
                        }
                    }
                }
                # Rebuild sorted group string
                sorted_group = arr[1]
                for (i = 2; i <= n; i++) {
                    sorted_group = sorted_group " " arr[i]
                }
                print sorted_group
            }
            prev_hash = hash
            group = path
            count = 1
        }
    }
    END {
        if (count >= 2) {
            n = split(group, arr, " ")
            for (i = 1; i <= n; i++) {
                for (j = i + 1; j <= n; j++) {
                    if (arr[i] > arr[j]) {
                        tmp = arr[i]
                        arr[i] = arr[j]
                        arr[j] = tmp
                    }
                }
            }
            sorted_group = arr[1]
            for (i = 2; i <= n; i++) {
                sorted_group = sorted_group " " arr[i]
            }
            print sorted_group
        }
    }
    ' | sort -k1,1
}
trial 2 (temp 0.7) — fail — FAIL got:
find_dupes() {
    local dir="$1"
    if [[ -z "$dir" ]]; then
        echo "Usage: find_dupes <dir>" >&2
        return 1
    fi

    local tmpfile
    tmpfile=$(mktemp)
    trap 'rm -f "$tmpfile"' EXIT

    # Find regular files, compute MD5, format as "hash  path"
    # Using 'md5 -r' for BSD/macOS compatibility
    find "$dir" -type f -exec sh -c '
        for f do
            hash=$(md5 -r "$f" 2>/dev/null | cut -d" " -f1)
            if [ -n "$hash" ]; then
                printf "%s  %s\n" "$hash" "$f"
            fi
        done
    ' sh {} + > "$tmpfile"

    # Sort by hash, then by path to group duplicates and ensure consistent ordering within groups
    sort -k1,1 -k2 "$tmpfile" | awk '
    {
        hash = $1
        # Reconstruct path (in case path contains spaces, though find_dupes usually implies simple paths or we handle them)
        # The format from md5 -r is "hash  filename", so $2 is the start of the path.
        # We need to capture the rest of the line as the path.
        path = ""
        for (i = 2; i <= NF; i++) {
            if (i == 2) path = $i
            else path = path " " $i
        }

        if (hash == prev_hash) {
            group = group " " path
            count++
        } else {
            if (count >= 2) {
                # Sort the paths within the group
                n = split(group, arr, " ")
                # Simple bubble sort for paths within the group
                for (i = 1; i <= n; i++) {
                    for (j = i + 1; j <= n; j++) {
                        if (arr[i] > arr[j]) {
                            tmp = arr[i]
                            arr[i] = arr[j]
                            arr[j] = tmp
                        }
                    }
                }
                # Rebuild sorted group string
                sorted_group = arr[1]
                for (i = 2; i <= n; i++) {
                    sorted_group = sorted_group " " arr[i]
                }
                print sorted_group
            }
            prev_hash = hash
            group = path
            count = 1
        }
    }
    END {
        if (count >= 2) {
            n = split(group, arr, " ")
            for (i = 1; i <= n; i++) {
                for (j = i + 1; j <= n; j++) {
                    if (arr[i] > arr[j]) {
                        tmp = arr[i]
                        arr[i] = arr[j]
                        arr[j] = tmp
                    }
                }
            }
            sorted_group = arr[1]
            for (i = 2; i <= n; i++) {
                sorted_group = sorted_group " " arr[i]
            }
            print sorted_group
        }
    }
    ' | sort -k1,1
}
top_errors — 0/3 passed
prompt sent to the model
Implement in bash: `top_errors <logfile> <n>`. Prints the n most frequent ERROR signatures in <logfile>. A signature is the text after 'ERROR: ' with every run of digits replaced by '#'. Output one per line as '<count> <signature>', sorted by count descending, then signature ascending. Print nothing if there are no ERROR lines.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — 3 disk
top_errors() {
    local logfile="$1"
    local n="$2"

    if [[ ! -f "$logfile" ]]; then
        return 0
    fi

    grep 'ERROR: ' "$logfile" 2>/dev/null | \
    sed 's/.*ERROR: //' | \
    sed 's/[0-9]\+/#/g' | \
    sort | \
    uniq -c | \
    sort -k1,1nr -k2,2 | \
    head -n "$n" | \
    awk '{print $1, $2}'
}
trial 1 (temp 0.7) — fail — 3 disk
top_errors() {
    local logfile="$1"
    local n="$2"

    if [[ ! -f "$logfile" ]]; then
        return 0
    fi

    grep 'ERROR: ' "$logfile" 2>/dev/null | \
    sed 's/.*ERROR: //' | \
    sed 's/[0-9]\+/#/g' | \
    sort | \
    uniq -c | \
    sort -k1,1nr -k2,2 | \
    head -n "$n" | \
    awk '{print $1, $2}'
}
trial 2 (temp 0.7) — fail — 3 disk
top_errors() {
    local logfile="$1"
    local n="$2"

    if [[ ! -f "$logfile" ]]; then
        return 0
    fi

    grep 'ERROR: ' "$logfile" 2>/dev/null | \
    sed 's/.*ERROR: //' | \
    sed 's/[0-9]\+/#/g' | \
    sort | \
    uniq -c | \
    sort -k1,1nr -k2,2 | \
    head -n "$n" | \
    awk '{print $1, $2}'
}

qwen3.5-27b 74% overall↑ top

Served via llama.cpp CUDA · — tok/s · — GB RAM · coding total 93/126

Bash — 15/24 (0.4 min / 1.5k tok)

count_matches — 0/3 passed
prompt sent to the model
Implement in bash: `count_matches <pattern> <file>`. Prints the number of lines in <file> matching <pattern> (fixed string). Prints 0 when nothing matches.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — FAIL count zzz
count_matches() {
    local pattern="$1"
    local file="$2"
    grep -F -c -- "$pattern" "$file" 2>/dev/null || echo 0
}
trial 1 (temp 0.7) — fail — FAIL count zzz
count_matches() {
    local pattern="$1"
    local file="$2"
    grep -F -c -- "$pattern" "$file" 2>/dev/null || echo 0
}
trial 2 (temp 0.7) — fail — FAIL count zzz
count_matches() {
    local pattern="$1"
    local file="$2"
    grep -F -c -- "$pattern" "$file" 2>/dev/null || echo 0
}
retry3 — 0/3 passed
prompt sent to the model
Implement in bash: `retry3 <cmd...>`. Runs the command; if it fails, retries up to 3 total attempts. Exits 0 if any attempt succeeds, otherwise exits with the last attempt's exit code.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — FAIL false succeeded
retry3() {
    local attempts=3
    local exit_code=1
    while (( attempts > 0 )); do
        if "$@"; then
            return 0
        fi
        exit_code=$?
        (( attempts-- ))
    done
    return $exit_code
}
trial 1 (temp 0.7) — fail — FAIL false succeeded
retry3() {
    local attempts=3
    local exit_code=1
    while (( attempts > 0 )); do
        if "$@"; then
            return 0
        fi
        exit_code=$?
        (( attempts-- ))
    done
    return $exit_code
}
trial 2 (temp 0.7) — fail — FAIL false succeeded
retry3() {
    local attempts=3
    local exit_code=1
    while (( attempts > 0 )); do
        if "$@"; then
            return 0
        fi
        exit_code=$?
        (( attempts-- ))
    done
    return $exit_code
}
extract_urls — 0/3 passed
prompt sent to the model
Implement in bash: `extract_urls`. Reads stdin, prints every http:// or https:// URL found, one per line, in order of appearance. Nothing else.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]"<>()]+'
}
trial 1 (temp 0.7) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]"<>()]+'
}
trial 2 (temp 0.7) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]"<>()]+'
}

Bash (hard) — 6/9 (0.5 min / 2.4k tok)

find_dupes — 0/3 passed
prompt sent to the model
Implement in bash: `find_dupes <dir>`. Finds groups of regular files under <dir> (recursive) with identical content (compare by MD5). Prints one group per line: space-separated paths, sorted, only groups of 2+ files. Groups sorted by first path. Must work on macOS (BSD userland: no GNU find -printf, no md5sum — use md5 -r).
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — FAIL got:
find_dupes() {
    local dir="$1"
    local tmpfile
    tmpfile=$(mktemp)
    trap "rm -f '$tmpfile'" EXIT

    # Find regular files, compute MD5, output "hash path"
    # macOS 'find' does not support -printf, so we use -exec
    # macOS 'md5' with -r outputs "MD5 (file) = hash" or "MD5 (file) = hash"
    # We parse the output to get "hash path"
    find "$dir" -type f -exec md5 -r {} + 2>/dev/null | \
    sed 's/^MD5 (\(.*\)) = \(.*\)$/\2 \1/' | \
    sort > "$tmpfile"

    # Process the sorted list to find duplicates
    local prev_hash=""
    local group=()
    local first_path=""

    while IFS=' ' read -r hash path; do
        if [[ "$hash" == "$prev_hash" ]]; then
            group+=("$path")
        else
            # Output previous group if it has 2+ files
            if [[ ${#group[@]} -ge 2 ]]; then
                # Sort paths within the group and print
                printf '%s\n' "${group[@]}" | sort | tr '\n' ' ' | sed 's/ $/\n/'
            fi
            group=("$path")
            first_path="$path"
            prev_hash="$hash"
        fi
    done < "$tmpfile"

    # Handle the last group
    if [[ ${#group[@]} -ge 2 ]]; then
        printf '%s\n' "${group[@]}" | sort | tr '\n' ' ' | sed 's/ $/\n/'
    fi
}
trial 1 (temp 0.7) — fail — FAIL got:
find_dupes() {
    local dir="$1"
    local tmpfile
    tmpfile=$(mktemp)
    trap "rm -f '$tmpfile'" EXIT

    # Find regular files, compute MD5, output "hash path"
    # macOS 'find' does not support -printf, so we use -exec
    # macOS 'md5' with -r outputs "MD5 (file) = hash" or "MD5 (file) = hash"
    # We parse the output to get "hash path"
    find "$dir" -type f -exec md5 -r {} + 2>/dev/null | \
    sed 's/^MD5 (\(.*\)) = \(.*\)$/\2 \1/' | \
    sort > "$tmpfile"

    # Process the sorted list to find duplicates
    local prev_hash=""
    local group=()
    local first_path=""

    while IFS=' ' read -r hash path; do
        if [[ "$hash" == "$prev_hash" ]]; then
            group+=("$path")
        else
            # Output previous group if it has 2+ files
            if [[ ${#group[@]} -ge 2 ]]; then
                # Sort paths within the group and print
                printf '%s\n' "${group[@]}" | sort | tr '\n' ' ' | sed 's/ $/\n/'
            fi
            group=("$path")
            first_path="$path"
            prev_hash="$hash"
        fi
    done < "$tmpfile"

    # Handle the last group
    if [[ ${#group[@]} -ge 2 ]]; then
        printf '%s\n' "${group[@]}" | sort | tr '\n' ' ' | sed 's/ $/\n/'
    fi
}
trial 2 (temp 0.7) — fail — FAIL got:
find_dupes() {
    local dir="$1"
    local tmpfile
    tmpfile=$(mktemp)
    trap "rm -f '$tmpfile'" EXIT

    # Find regular files, compute MD5, output "hash path"
    # macOS 'find' does not support -printf, so we use -exec
    # macOS 'md5' with -r outputs "MD5 (file) = hash" or "MD5 (file) = hash"
    # We parse the output to get "hash path"
    find "$dir" -type f -exec md5 -r {} + 2>/dev/null | \
    sed 's/^MD5 (\(.*\)) = \(.*\)$/\2 \1/' | \
    sort > "$tmpfile"

    # Process the sorted list to find duplicates
    local prev_hash=""
    local group=()
    local first_path=""

    while IFS=' ' read -r hash path; do
        if [[ "$hash" == "$prev_hash" ]]; then
            group+=("$path")
        else
            # Output previous group if it has 2+ files
            if [[ ${#group[@]} -ge 2 ]]; then
                # Sort paths within the group and print
                printf '%s\n' "${group[@]}" | sort | tr '\n' ' ' | sed 's/ $/\n/'
            fi
            group=("$path")
            first_path="$path"
            prev_hash="$hash"
        fi
    done < "$tmpfile"

    # Handle the last group
    if [[ ${#group[@]} -ge 2 ]]; then
        printf '%s\n' "${group[@]}" | sort | tr '\n' ' ' | sed 's/ $/\n/'
    fi
}

k2-horizon 36B-A4B 72% overall↑ top

Served via llama.cpp CUDA · — tok/s · — GB RAM · coding total 91/126

Bash — 15/24 (0.2 min / 1.6k tok)

retry3 — 2/3 passed
prompt sent to the model
Implement in bash: `retry3 <cmd...>`. Runs the command; if it fails, retries up to 3 total attempts. Exits 0 if any attempt succeeds, otherwise exits with the last attempt's exit code.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — FAIL false succeeded
retry3() {
    local attempt
    for attempt in 1 2 3; do
        if "$@"; then
            return 0
        fi
    done
    return $?
}
extract_urls — 0/3 passed
prompt sent to the model
Implement in bash: `extract_urls`. Reads stdin, prints every http:// or https:// URL found, one per line, in order of appearance. Nothing else.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]]+' || true
}
trial 1 (temp 0.7) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]]+' || true
}
trial 2 (temp 0.7) — fail — https://c.net
extract_urls() {
    grep -oE 'https?://[^[:space:]]+' || true
}
csv_col — 1/3 passed
prompt sent to the model
Implement in bash: `csv_col <name>`. Reads a CSV from stdin (first line is a header). Prints the values of the column named <name>, one per line, in order.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 1 (temp 0.7) — fail — bob
csv_col() {
    local name="$1"
    local header
    IFS= read -r header
    local col
    local IFS=','
    set -- $header
    local i=0
    for col; do
        i=$((i + 1))
        if [[ "$col" == "$name" ]]; then
            break
        fi
    done
    if [[ $i -eq 0 ]]; then
        return 1
    fi
    local line
    while IFS= read -r line; do
        local IFS=','
        set -- $line
        local IFS=' '
        echo "$1"
        shift
        i=$((i - 1))
        if [[ $i -eq 0 ]]; then
            break
        fi
    done
}
trial 2 (temp 0.7) — fail — bob
csv_col() {
    local name="$1"
    local header
    IFS= read -r header
    local col
    local IFS=','
    set -- $header
    local i=0
    for col; do
        i=$((i + 1))
        if [[ "$col" == "$name" ]]; then
            break
        fi
    done
    if [[ $i -eq 0 ]]; then
        return 1
    fi
    local line
    while IFS= read -r line; do
        local IFS=','
        set -- $line
        local IFS=' '
        echo "$1"
        shift
        i=$((i - 1))
        if [[ $i -eq 0 ]]; then
            break
        fi
    done
}
json_get — 0/3 passed
prompt sent to the model
Implement in bash: `json_get <key>`. Reads a flat JSON object on stdin and prints the string value of top-level <key>. python3 is available; jq is not.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — KeyError: '$1'
json_get() {
    python3 -c 'import json,sys; print(json.load(sys.stdin)["$1"])'
}
trial 1 (temp 0.7) — fail — KeyError: '$1'
json_get() {
    python3 -c 'import json,sys; print(json.load(sys.stdin)["$1"])'
}
trial 2 (temp 0.7) — fail — KeyError: '$1'
json_get() {
    python3 -c 'import json,sys; print(json.load(sys.stdin)["$1"])'
}

Bash (hard) — 5/9 (0.2 min / 1.5k tok)

find_dupes — 0/3 passed
prompt sent to the model
Implement in bash: `find_dupes <dir>`. Finds groups of regular files under <dir> (recursive) with identical content (compare by MD5). Prints one group per line: space-separated paths, sorted, only groups of 2+ files. Groups sorted by first path. Must work on macOS (BSD userland: no GNU find -printf, no md5sum — use md5 -r).
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — FAIL got:
find_dupes() {
    local dir="$1"
    [ -d "$dir" ] || return 1
    local tmp
    tmp=$(mktemp -t find_dupes.XXXXXX) || return 1
    trap 'rm -f "$tmp"' RETURN

    find "$dir" -type f -print0 2>/dev/null | while IFS= read -r -d '' f; do
        md5 -r "$f" 2>/dev/null | awk -v p="$f" '{print $1 " " p}'
    done > "$tmp"

    awk '{h[$1]=h[$1] " " $2} END {for (k in h) if (split(h[k], a, " ") > 1) print h[k]}' "$tmp" \
        | sed 's/^ //' \
        | sort -k1,1 \
        | while IFS= read -r line; do
            echo "$line"
          done
}
trial 1 (temp 0.7) — fail — FAIL got:
find_dupes() {
    local dir="$1"
    [ -d "$dir" ] || return 1
    local tmp
    tmp=$(mktemp -t find_dupes.XXXXXX) || return 1
    trap 'rm -f "$tmp"' RETURN

    find "$dir" -type f -print0 2>/dev/null | while IFS= read -r -d '' f; do
        md5=$(md5 -q "$f" 2>/dev/null) || continue
        printf '%s\t%s\n' "$md5" "$f"
    done | sort -k1,1 -k2,2 > "$tmp"

    awk -F '\t' '
        { if ($1 != prev) { if (count > 1) print group; group=""; count=0 } prev=$1; group = group ? group " " $2 : $2; count++ }
        END { if (count > 1) print group }
    ' "$tmp"
}
trial 2 (temp 0.7) — fail — FAIL got:
find_dupes() {
    local dir="$1"
    [ -d "$dir" ] || return 1
    local tmp
    tmp=$(mktemp -t find_dupes.XXXXXX) || return 1
    trap 'rm -f "$tmp"' RETURN

    find "$dir" -type f -print0 2>/dev/null | while IFS= read -r -d '' f; do
        md5=$(md5 -q "$f" 2>/dev/null) || continue
        printf '%s\t%s\n' "$md5" "$f"
    done | sort -k1,1 -k2,2 > "$tmp"

    awk -F '\t' '
        { if ($1 != prev) { if (count > 1) print group; group=""; count=0 } prev=$1; group = group ? group " " $2 : $2; count++ }
        END { if (count > 1) print group }
    ' "$tmp"
}
backup_rotate — 2/3 passed
prompt sent to the model
Implement in bash: `backup_rotate <dir> <keep>`. In <dir>, deletes all but the <keep> newest files matching backup-*.tar.gz (newest = lexicographically greatest names). Prints each deleted file's name (not path), one per line, oldest first. Deletes nothing if there are <= <keep> backups (prints nothing).
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — backup-20260101-120000.tar.gz
backup_rotate() {
    local dir="$1" keep="$2"
    local files
    files=$(ls -1 "$dir"/backup-*.tar.gz 2>/dev/null | sort -r)
    local count
    count=$(printf '%s\n' "$files" | grep -c .)
    if [ "$count" -le "$keep" ]; then
        return 0
    fi
    local to_delete=$((count - keep))
    printf '%s\n' "$files" | tail -n "$to_delete" | while IFS= read -r f; do
        rm -f "$f"
        basename "$f"
    done
}

mistral-small-4 119B 69% overall↑ top

Served via llama.cpp CUDA · — tok/s · — GB RAM · coding total 87/126

Bash — 15/24 (0.2 min / 2.1k tok)

extract_urls — 0/3 passed
prompt sent to the model
Implement in bash: `extract_urls`. Reads stdin, prints every http:// or https:// URL found, one per line, in order of appearance. Nothing else.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — https://c.net
extract_urls() {
  grep -oE 'https?://[^[:space:]"]+'
}
trial 1 (temp 0.7) — fail — https://c.net
extract_urls() {
  grep -oE 'https?://[^[:space:]"]+'
}
trial 2 (temp 0.7) — fail — https://c.net
extract_urls() {
  grep -oE 'https?://[^[:space:]"]+'
}
csv_col — 0/3 passed
prompt sent to the model
Implement in bash: `csv_col <name>`. Reads a CSV from stdin (first line is a header). Prints the values of the column named <name>, one per line, in order.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — FAIL got:
csv_col() {
  local name="$1"
  local header
  local col_index
  local line

  header=$(head -n 1)
  col_index=$(echo "$header" | awk -F, -v name="$name" '{
    for (i=1; i<=NF; i++) {
      if ($i == name) {
        print i;
        exit;
      }
    }
    exit 1;
  }')

  if [ -z "$col_index" ]; then
    echo "Column '$name' not found in CSV header" >&2
    exit 1
  fi

  while IFS= read -r line; do
    echo "$line" | cut -d, -f"$col_index"
  done
}
trial 1 (temp 0.7) — fail — FAIL got:
csv_col() {
  local name="$1"
  local header
  local col_index
  local line

  header=$(head -n 1)
  col_index=$(echo "$header" | awk -F, -v name="$name" '{
    for (i=1; i<=NF; i++) {
      if ($i == name) {
        print i;
        exit
      }
    }
    exit 1
  }')

  if [ -z "$col_index" ]; then
    echo "Column '$name' not found in CSV header" >&2
    exit 1
  fi

  while IFS= read -r line; do
    echo "$line" | awk -F, -v index="$col_index" '{print $index}'
  done
}
trial 2 (temp 0.7) — fail — FAIL got:
csv_col() {
  local name="$1"
  local header
  local col_index
  local line

  header=$(head -n 1)
  col_index=$(echo "$header" | awk -F, -v name="$name" '{
    for (i=1; i<=NF; i++) {
      if ($i == name) {
        print i;
        exit
      }
    }
    exit 1
  }')

  if [ -z "$col_index" ]; then
    echo "Column '$name' not found in CSV header" >&2
    exit 1
  fi

  while IFS= read -r line; do
    echo "$line" | awk -F, -v index="$col_index" '{print $index}'
  done
}
json_get — 0/3 passed
prompt sent to the model
Implement in bash: `json_get <key>`. Reads a flat JSON object on stdin and prints the string value of top-level <key>. python3 is available; jq is not.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — FAIL name
json_get() {
  local key="$1"
  local line
  while IFS= read -r line; do
    if [[ "$line" =~ ^[[:space:]]*\"$key\"[[:space:]]*:[[:space:]]*\"([^\"]*)\" ]]; then
      echo "${BASH_REMATCH[1]}"
      return
    elif [[ "$line" =~ ^[[:space:]]*\"$key\"[[:space:]]*:[[:space:]]*\'([^\']*)\' ]]; then
      echo "${BASH_REMATCH[1]}"
      return
    elif [[ "$line" =~ ^[[:space:]]*\"$key\"[[:space:]]*:[[:space:]]*([0-9]+) ]]; then
      echo "${BASH_REMATCH[1]}"
      return
    elif [[ "$line" =~ ^[[:space:]]*\"$key\"[[:space:]]*:[[:space:]]*([a-z]+) ]]; then
      echo "${BASH_REMATCH[1]}"
      return
    fi
  done
}
trial 1 (temp 0.7) — fail — FAIL name
json_get() {
  local key="$1"
  local line
  while IFS= read -r line; do
    if [[ "$line" =~ ^[[:space:]]*\"$key\"[[:space:]]*:[[:space:]]*\"([^\"]*)\" ]]; then
      echo "${BASH_REMATCH[1]}"
      return
    elif [[ "$line" =~ ^[[:space:]]*\"$key\"[[:space:]]*:[[:space:]]*([^[:space:],\}]*) ]]; then
      echo "${BASH_REMATCH[1]}"
      return
    fi
  done
}
trial 2 (temp 0.7) — fail — FAIL name
json_get() {
  local key="$1"
  local line
  while IFS= read -r line; do
    if [[ "$line" =~ ^[[:space:]]*\"$key\"[[:space:]]*:[[:space:]]*\"([^\"]*)\" ]]; then
      echo "${BASH_REMATCH[1]}"
      return
    elif [[ "$line" =~ ^[[:space:]]*\"$key\"[[:space:]]*:[[:space:]]*([^[:space:],\}]*) ]]; then
      echo "${BASH_REMATCH[1]}"
      return
    fi
  done
}

Bash (hard) — 3/9 (0.1 min / 1.3k tok)

find_dupes — 0/3 passed
prompt sent to the model
Implement in bash: `find_dupes <dir>`. Finds groups of regular files under <dir> (recursive) with identical content (compare by MD5). Prints one group per line: space-separated paths, sorted, only groups of 2+ files. Groups sorted by first path. Must work on macOS (BSD userland: no GNU find -printf, no md5sum — use md5 -r).
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — find: ‘md5’: No such file or directory
find_dupes() {
  local dir="$1"
  find "$dir" -type f -exec md5 -r {} + | sort | awk '{
    md5=$1
    path=$2
    gsub(/^[ \t]+|[ \t]+$/, "", path)
    if (md5 in seen) {
      seen[md5] = seen[md5] " " path
    } else {
      seen[md5] = path
    }
  } END {
    for (m in seen) {
      if (split(seen[m], files) > 1) {
        print seen[m]
      }
    }
  }' | sort
}
trial 1 (temp 0.7) — fail — find: ‘md5’: No such file or directory
find_dupes() {
  local dir="$1"
  find "$dir" -type f -exec md5 -r {} + | sort | awk '{
    md5=$1
    path=$2
    if (md5 != prev) {
      if (NR > 1) {
        if (count > 1) {
          for (i=1; i<=NF; i++) if (i>1) print paths[i]
          print path
          for (i=1; i<=NF; i++) if (i>1) paths[i]=""
        }
        delete paths
        count=0
      }
      prev=md5
    }
    paths[++count]=$2
  } END {
    if (count > 1) {
      for (i=1; i<=NF; i++) if (i>1) print paths[i]
      print path
    }
  }' | sort -u
}
trial 2 (temp 0.7) — fail — find: ‘md5’: No such file or directory
find_dupes() {
  local dir="$1"
  find "$dir" -type f -exec md5 -r {} + | sort | awk '{
    md5=$1
    path=$2
    if (md5 != prev) {
      if (NR > 1) {
        if (count > 1) {
          for (i=1; i<=NF; i++) if (i>1) print paths[i]
          print path
          for (i=1; i<=NF; i++) if (i>1) paths[i]=""
        }
        delete paths
        count=0
      }
      prev=md5
    }
    paths[++count]=$2
  } END {
    if (count > 1) {
      for (i=1; i<=NF; i++) if (i>1) print paths[i]
      print path
    }
  }' | sort -u
}
top_errors — 0/3 passed
prompt sent to the model
Implement in bash: `top_errors <logfile> <n>`. Prints the n most frequent ERROR signatures in <logfile>. A signature is the text after 'ERROR: ' with every run of digits replaced by '#'. Output one per line as '<count> <signature>', sorted by count descending, then signature ascending. Print nothing if there are no ERROR lines.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — 3 disk
top_errors() {
  local logfile="$1"
  local n="$2"
  grep -o 'ERROR: [^0-9]*' "$logfile" | sed 's/ERROR: //' | sed 's/[0-9]\+/#/g' | sort | uniq -c | sort -nr | head -n "$n" | awk '{count=$1; $1=""; print count, substr($0, 2)}' | sort -k1,1nr -k2,2
}
trial 1 (temp 0.7) — fail — 3 disk
top_errors() {
  local logfile="$1"
  local n="$2"
  grep -o 'ERROR: [^0-9]*' "$logfile" | sed 's/ERROR: //' | sed 's/[0-9]\+/#/g' | sort | uniq -c | sort -nr | head -n "$n" | awk '{count=$1; $1=""; print count, substr($0, 2)}' | sort -k1,1nr -k2,2 | head -n "$n" | awk '{print $1, $2}'
}
trial 2 (temp 0.7) — fail — 3 disk
top_errors() {
  local logfile="$1"
  local n="$2"
  grep -o 'ERROR: [^0-9]*' "$logfile" | sed 's/ERROR: //' | sed 's/[0-9]\+/#/g' | sort | uniq -c | sort -nr | head -n "$n" | awk '{count=$1; $1=""; print count, substr($0, 2)}' | sort -k1,1nr -k2,2 | head -n "$n" | awk '{print $1, $2}'
}

seed-oss 36b 65% overall↑ top

Served via llama.cpp CUDA · — tok/s · — GB RAM · coding total 82/126

Bash — 17/24 (11.2 min / 42.5k tok)

count_matches — 2/3 passed
prompt sent to the model
Implement in bash: `count_matches <pattern> <file>`. Prints the number of lines in <file> matching <pattern> (fixed string). Prints 0 when nothing matches.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — FAIL count zzz
count_matches() {
  awk -v pattern="$1" 'index($0, pattern) { count++ } END { print count }' "$2"
}
extract_urls — 0/3 passed
prompt sent to the model
Implement in bash: `extract_urls`. Reads stdin, prints every http:// or https:// URL found, one per line, in order of appearance. Nothing else.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — https://c.net
extract_urls() {
  grep -oP 'https?://\S+'
}
trial 1 (temp 0.7) — fail — https://c.net
extract_urls() {
    grep -oP "https?://[^\s<>\"'()\[\]{}]+"
}
trial 2 (temp 0.7) — fail — https://c.net
extract_urls() {
    grep -oP "https?://[^\s<>\"'()\[\]{}]+"
}
sum_stdin — 2/3 passed
prompt sent to the model
Implement in bash: `sum_stdin`. Reads integers from stdin, one per line, ignoring blank lines. Prints their sum.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — FAIL empty
sum_stdin() {
  awk 'NF { sum += $0 } END { print sum }'
}
json_get — 1/3 passed
prompt sent to the model
Implement in bash: `json_get <key>`. Reads a flat JSON object on stdin and prints the string value of top-level <key>. python3 is available; jq is not.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 1 (temp 0.7) — truncated — hit the 4096-token cap
(no code extracted)
trial 2 (temp 0.7) — truncated — hit the 4096-token cap
json_get() {
  python3 -c 'import json, sys; print(json.loads(sys.stdin.read())[sys.argv[1]])' -- "$1"
}

Bash (hard) — 2/9 (8.5 min / 32.0k tok)

find_dupes — 0/3 passed
prompt sent to the model
Implement in bash: `find_dupes <dir>`. Finds groups of regular files under <dir> (recursive) with identical content (compare by MD5). Prints one group per line: space-separated paths, sorted, only groups of 2+ files. Groups sorted by first path. Must work on macOS (BSD userland: no GNU find -printf, no md5sum — use md5 -r).
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — truncated — hit the 4096-token cap
(no code extracted)
trial 1 (temp 0.7) — truncated — hit the 4096-token cap
(no code extracted)
trial 2 (temp 0.7) — truncated — hit the 4096-token cap
(no code extracted)
top_errors — 1/3 passed
prompt sent to the model
Implement in bash: `top_errors <logfile> <n>`. Prints the n most frequent ERROR signatures in <logfile>. A signature is the text after 'ERROR: ' with every run of digits replaced by '#'. Output one per line as '<count> <signature>', sorted by count descending, then signature ascending. Print nothing if there are no ERROR lines.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 1 (temp 0.7) — fail — 3 disk # full
top_errors() {
  awk -F 'ERROR: ' '{if (NF > 1) print $2}' "$1" |
    sed -E 's/[0-9]+/#/g' |
    sort |
    uniq -c |
    sort -k1,1nr -k2,2 |
    head -n "$2"
}
trial 2 (temp 0.7) — fail — 3 disk # full
top_errors() {
  awk -F 'ERROR: ' '{if (NF > 1) print $2}' "$1" |
    sed -E 's/[0-9]+/#/g' |
    sort |
    uniq -c |
    sort -k1,1nr -k2,2 |
    head -n "$2"
}
backup_rotate — 1/3 passed
prompt sent to the model
Implement in bash: `backup_rotate <dir> <keep>`. In <dir>, deletes all but the <keep> newest files matching backup-*.tar.gz (newest = lexicographically greatest names). Prints each deleted file's name (not path), one per line, oldest first. Deletes nothing if there are <= <keep> backups (prints nothing).
Reply with only a bash code block defining the function. No tests, no explanation.
trial 1 (temp 0.7) — truncated — hit the 4096-token cap
(no code extracted)
trial 2 (temp 0.7) — truncated — hit the 4096-token cap
(no code extracted)

aya-23 35b 48% overall↑ top

Served via llama.cpp CUDA · — tok/s · — GB RAM · coding total 61/126

Bash — 12/24 (0.5 min / 1.9k tok)

largest_file — 0/3 passed
prompt sent to the model
Implement in bash: `largest_file <dir>`. Prints the path of the largest regular file under <dir> (recursive). Exactly one line, the path.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — FAIL got
function largest_file() {
    local dir="$1"
    local max_size=0
    local max_file=""
    find "$dir" -type f -exec du -ch {} + | sort -rh | awk '{ if ($1 > '$(printf "%d\n" "$max_size")') { max_file = $2; max_size = $1 } }'
    echo "$max_file"
}
trial 1 (temp 0.7) — fail — FAIL got
function largest_file() {
    local dir="$1"
    local max_size=0
    local max_file=""
    find "$dir" -type f -exec du -ch {} + | sort -rh | awk '{ if ($1 > '$(printf "%d\n" "$max_size")') { max_file = $2; max_size = $1 } }'
    echo "$max_file"
}
trial 2 (temp 0.7) — fail — FAIL got
function largest_file() {
    local dir="$1"
    local max_size=0
    local max_file=""
    find "$dir" -type f -exec du -ch {} + | sort -rh | awk '{ if ($1 > '$(printf "%d\n" "$max_size")') { max_file = $2; max_size = $1 } }'
    echo "$max_file"
}
retry3 — 0/3 passed
prompt sent to the model
Implement in bash: `retry3 <cmd...>`. Runs the command; if it fails, retries up to 3 total attempts. Exits 0 if any attempt succeeds, otherwise exits with the last attempt's exit code.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — FAIL false succeeded
retry3() {
  local attempts=0
  local -i max_attempts=3
  local -i exit_code=0

  until [[ $attempts -ge $max_attempts ]]; do
    ((attempts++))
    $@
    exit_code=$?
    if [[ $exit_code -eq 0 ]]; then
      break
    fi
  done

  exit $exit_code
}
trial 1 (temp 0.7) — fail — FAIL false succeeded
retry3() {
  local attempts=0
  local -r cmd="$@"
  until [[ $attempts -ge 3 ]]; do
    attempts=$((attempts + 1))
    if eval "$cmd"; then
      return 0
    fi
  done
  return $?
}
trial 2 (temp 0.7) — fail — FAIL false succeeded
retry3() {
  local attempts=0
  local -r cmd="$@"
  until [[ $attempts -ge 3 ]]; do
    attempts=$((attempts + 1))
    if eval "$cmd"; then
      return 0
    fi
  done
  return $?
}
extract_urls — 0/3 passed
prompt sent to the model
Implement in bash: `extract_urls`. Reads stdin, prints every http:// or https:// URL found, one per line, in order of appearance. Nothing else.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — Unmatched [ in regex; marked by <-- HERE in m/(https?|ftp)://[ <-- HERE ^\s/ at -e line 1.
function extract_urls() {
    while IFS= read -r line; do
        urls=$(echo "$line" | perl -ne 'print "$1\n" if /(https?|ftp):\/\/[^\s/]+/i')
        echo "$urls"
    done
}
trial 1 (temp 0.7) — fail — Unmatched [ in regex; marked by <-- HERE in m/(https?|ftp)://[ <-- HERE ^\s/ at -e line 1.
function extract_urls() {
    while IFS= read -r line; do
        urls=$(echo "$line" | perl -ne 'print "$1\n" if /(https?|ftp):\/\/[^\s/]+/i')
        echo "$urls"
    done
}
trial 2 (temp 0.7) — fail — Unmatched [ in regex; marked by <-- HERE in m/(https?|ftp)://[ <-- HERE ^\s/ at -e line 1.
function extract_urls() {
    while IFS= read -r line; do
        urls=$(echo "$line" | perl -ne 'print "$1\n" if /(https?|ftp):\/\/[^\s/]+/i')
        echo "$urls"
    done
}
csv_col — 0/3 passed
prompt sent to the model
Implement in bash: `csv_col <name>`. Reads a CSV from stdin (first line is a header). Prints the values of the column named <name>, one per line, in order.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — FAIL got:
function csv_col() {
    local col=$1
    local header=$(head -n 1 < /dev/stdin)
    local cols=$(echo "$header" | tr ',' '\n' | wc -l)
    local i=0
    while IFS= read -r line; do
        local val=$(echo "$line" | awk -v col=$col -v header=$header '
            $1 == col { print $NF }
            $1 == header { for (i=2; i<=NF; i++) printf "%s,", $i; print "" }
        ')
        if [[ $val ]]; then
            echo "$val"
        fi
    done
}
trial 1 (temp 0.7) — fail — FAIL got:
function csv_col() {
    local col=$1
    local header=$(head -n 1 < /dev/stdin)
    local cols=$(echo "$header" | tr ',' '\n' | wc -l)
    local i=0
    while IFS= read -r line; do
        local val=$(echo "$line" | awk -v col=$col -v header=$header '
            $1 == col { print $NF }
            $1 == header { for (i=2; i<=NF; i++) printf "%s,", $i; print "" }
        ')
        if [[ $val ]]; then
            echo "$val"
        fi
    done
}
trial 2 (temp 0.7) — fail — FAIL got:
function csv_col() {
    local col=$1
    local header=$(head -n 1 < /dev/stdin)
    local cols=$(echo "$header" | tr ',' '\n' | wc -l)
    local i=0
    while IFS= read -r line; do
        local val=$(echo "$line" | awk -v col=$col -v header=$header '
            $1 == col { print $NF }
            $1 == header { for (i=2; i<=NF; i++) printf "%s,", $i; print "" }
        ')
        if [[ $val ]]; then
            echo "$val"
        fi
    done
}

Bash (hard) — 0/9 (0.5 min / 1.8k tok)

find_dupes — 0/3 passed
prompt sent to the model
Implement in bash: `find_dupes <dir>`. Finds groups of regular files under <dir> (recursive) with identical content (compare by MD5). Prints one group per line: space-separated paths, sorted, only groups of 2+ files. Groups sorted by first path. Must work on macOS (BSD userland: no GNU find -printf, no md5sum — use md5 -r).
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — solution.sh: line 3: md5: command not found
function find_dupes() {
    local dir="$1"
    local md5s=$(md5 -r "$dir" | awk '{print $3, $1}')
    local groups=$(echo "$md5s" | sort -k1 | awk -F' ' '{n[$1]++} END {for (i in n) {if (n[i] > 1) print i}}')
    local paths=()
    for group in $groups; do
        paths+=($(find "$dir" -type f -md5 "$group" -print0 | xargs -0))
    done
    echo "${paths[@]}" | sort -z | tr ' ' '\0' | sort -z | tr '\0' ' '
}
trial 1 (temp 0.7) — fail — solution.sh: line 3: md5: command not found
function find_dupes() {
    local dir="$1"
    local md5s=$(md5 -r "$dir" | awk '{print $1, $2}')
    local groups=$(echo "$md5s" | sort -k2 | uniq -w32 -c -i | awk '!seen[$2]++ {groups[$1]=$2} END {for (i in groups) print groups[i], i}')
    local paths=$(echo "$groups" | awk '{print $2}' | xargs -I{} find "$dir" -type f -md5 {} | sort -k3 | awk '!seen[$0]++ {paths[$1]=$0} END {for (i in paths) print paths[i]}')
    echo "$paths"
}
trial 2 (temp 0.7) — fail — solution.sh: line 3: md5: command not found
function find_dupes() {
    local dir="$1"
    local md5s=$(md5 -r "$dir" | awk '{print $1, $2}')
    local groups=$(echo "$md5s" | sort -k2 | uniq -w32 -c -i | awk '!seen[$2]++ {groups[$1]=$2} END {for (i in groups) print groups[i], i}')
    local paths=$(echo "$groups" | awk '{print $2}' | xargs -I{} find "$dir" -type f -md5 {} | sort -k3 | awk '!seen[$0]++ {paths[$1]=$0} END {for (i in paths) print paths[i]}')
    echo "$paths"
}
top_errors — 0/3 passed
prompt sent to the model
Implement in bash: `top_errors <logfile> <n>`. Prints the n most frequent ERROR signatures in <logfile>. A signature is the text after 'ERROR: ' with every run of digits replaced by '#'. Output one per line as '<count> <signature>', sorted by count descending, then signature ascending. Print nothing if there are no ERROR lines.
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — test.sh: line 12: top_errors: command not found
function top_errors() {
    local file="$1"
    local n="$2"
    local err_counts=()
    local err_sigs=()

    if [[ ! -f "$file" ]]; then
        echo "File not found: $file"
        return 1
    fi

    while IFS= read -r line; do
        if [[ $line == ERROR:* ]]; then
            local sig="${line##*ERROR:}"
            sig="${sig//[0-9]/#}"
            err_counts+=("$sig")
        fi
    done < "$file"

    for sig in "${err_counts[@]}"; do
        err_sigs+=("$sig")
    done

    local sorted_indices=($(for i in "${!err_counts[@]}"; do echo -en "${err_counts[$i]}\t$i\n"; done) | sort -nr | cut -f2 -d\ )

    for i in "${sorted_indices[@]}"; do
        echo "${err_counts[$i]} ${err_sigs[$i]}"
    done | head -n "$n"
}
trial 1 (temp 0.7) — fail — test.sh: line 12: top_errors: command not found
function top_errors() {
    local file="$1"
    local n="$2"
    local err_counts=()
    local err_sigs=()

    if [[ ! -f "$file" ]]; then
        echo "File not found: $file"
        return 1
    fi

    while IFS= read -r line; do
        if [[ $line == ERROR:* ]]; then
            local sig="${line##*ERROR:}"
            sig="${sig//[0-9]/#}"
            err_counts+=("$sig")
        fi
    done < "$file"

    for sig in "${err_counts[@]}"; do
        err_sigs+=("$sig")
    done

    local sorted_indices=($(for i in "${!err_counts[@]}"; do echo -en "${err_counts[$i]}\t$i\n"; done) | sort -nr | cut -f2 -d\ )

    for i in "${sorted_indices[@]}"; do
        echo "${err_counts[$i]} ${err_sigs[$i]}"
    done | head -n "$n"
}
trial 2 (temp 0.7) — fail — test.sh: line 12: top_errors: command not found
function top_errors() {
    local file="$1"
    local n="$2"
    local err_counts=()
    local err_sigs=()

    if [[ ! -f "$file" ]]; then
        echo "File not found: $file"
        return 1
    fi

    while IFS= read -r line; do
        if [[ $line == ERROR:* ]]; then
            local sig="${line##*ERROR:}"
            sig="${sig//[0-9]/#}"
            err_counts+=("$sig")
        fi
    done < "$file"

    for sig in "${err_counts[@]}"; do
        err_sigs+=("$sig")
    done

    local sorted_indices=($(for i in "${!err_counts[@]}"; do echo -en "${err_counts[$i]}\t$i\n"; done) | sort -nr | cut -f2 -d\ )

    for i in "${sorted_indices[@]}"; do
        echo "${err_counts[$i]} ${err_sigs[$i]}"
    done | head -n "$n"
}
backup_rotate — 0/3 passed
prompt sent to the model
Implement in bash: `backup_rotate <dir> <keep>`. In <dir>, deletes all but the <keep> newest files matching backup-*.tar.gz (newest = lexicographically greatest names). Prints each deleted file's name (not path), one per line, oldest first. Deletes nothing if there are <= <keep> backups (prints nothing).
Reply with only a bash code block defining the function. No tests, no explanation.
trial 0 (temp 0) — fail — bk/backup-20260101-120000.tar.gz:2
function backup_rotate() {
    local dir="$1"
    local keep="$2"
    local files=("$dir"/backup-*.tar.gz)
    local -a to_delete=()
    local -a to_keep=()

    # sort files oldest to newest
    sorted_files=($(for file in "${files[@]}"; do echo "$file"; done | sort -r))

    # delete oldest files until we have 'keep' number of files left
    for file in "${sorted_files[@]:0:$((${#sorted_files[@]} - $keep))}"; do
        to_delete+=("$file")
    done

    # move remaining files to 'to_keep' array
    for file in "${sorted_files[@]:$((${#sorted_files[@]} - $keep))}:$keep"; do
        to_keep+=("$file")
    done

    # delete the files
    for file in "${to_delete[@]}"; do
        echo "$file"
        rm "$file"
    done

    # print the remaining files
    for file in "${to_keep[@]}"; do
        echo "$file"
    done
}
trial 1 (temp 0.7) — fail — bk/backup-20260101-120000.tar.gz:2
function backup_rotate() {
    local dir="$1"
    local keep="$2"
    local files=("$dir"/backup-*.tar.gz)
    local -a to_delete=()
    local -a to_keep=()

    # sort files oldest to newest
    IFS=$'\n' sorted_files=($(sort -r <<< "${files[*]}"))
    unset IFS

    # delete all but the newest <keep> files
    for file in "${sorted_files[@]:keep:1}"; do
        to_delete+=("$file")
    done

    # print deleted files oldest first
    for file in "${to_delete[@]}"; do
        echo "$file"
    done

    # delete files
    for file in "${to_delete[@]}"; do
        rm "$file"
    done
}
trial 2 (temp 0.7) — fail — bk/backup-20260101-120000.tar.gz:2
function backup_rotate() {
    local dir="$1"
    local keep="$2"
    local files=("$dir"/backup-*.tar.gz)
    local -a to_delete=()
    local -a to_keep=()

    # sort files oldest to newest
    IFS=$'\n' sorted_files=($(sort -r <<< "${files[*]}"))
    unset IFS

    # delete all but the newest <keep> files
    for file in "${sorted_files[@]:keep:1}"; do
        to_delete+=("$file")
    done

    # print deleted files oldest first
    for file in "${to_delete[@]}"; do
        echo "$file"
    done

    # delete files
    for file in "${to_delete[@]}"; do
        rm "$file"
    done
}