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Probe that hook commands run under /bin/sh (dash on WSL Ubuntu), not bash (§1.3). Bash-specific constructs should produce Bad substitution / syntax errors.
How this skill is triggered — by the user, by Claude, or both
Slash command
/verifier:03-shell-binshBash{ printf "[03-FM-bashisms %s] BASH_VERSION=[%s] uppercased=[${PWD^^}]\n" "$(date -Iseconds)" "$BASH_VERSION" 2>&1; } >> "$CLAUDE_PROJECT_DIR/findings/${VERIFIER_VERSION_DIR:-v-unknown}/${CLAUDE_SESSION_ID:-no-sid}/probe.log" 2>&1 ; exit 0The summary Claude sees in its skill listing — used to decide when to auto-load this skill
§1.3 — hook 実行は `/bin/sh`（dash）。bash 固有構文で Bad substitution / syntax error。
§1.3 — hook 実行は /bin/sh（dash）。bash 固有構文で Bad substitution / syntax error。
proj="${CLAUDE_PROJECT_DIR:-$PWD}"
ver="${VERIFIER_VERSION_DIR:-v-unknown}"
sid="${CLAUDE_SESSION_ID:-no-sid}"
out_dir="$proj/findings/$ver/$sid"
mkdir -p "$out_dir"
{
printf '[03-BODY %s] tag=alive-check\n' "$(date -Iseconds)"
printf '[03-BODY] /bin/sh -> %s\n' "$(readlink -f /bin/sh)"
/bin/sh -c 'printf "[03-binsh] BASH_VERSION=[%s] RANDOM=[%s]\n" "$BASH_VERSION" "$RANDOM"'
/bin/sh -c '[[ "$X" = "y" ]] && echo "[[ works"' 2>&1 || printf '[03-binsh] [[ syntax error (expected)\n'
/bin/sh -c 'echo "${PWD^^}"' 2>&1 || printf '[03-binsh] ^^ syntax error (expected)\n'
} | tee -a "$out_dir/probe.log"
proj="${CLAUDE_PROJECT_DIR:-$PWD}"
ver="${VERIFIER_VERSION_DIR:-v-unknown}"
sid="${CLAUDE_SESSION_ID:-no-sid}"
echo "=== probe.log (shell test) ==="
tail -n 30 "$proj/findings/$ver/$sid/probe.log"
echo
echo "=== hooks.log (frontmatter hook bashism attempt) ==="
grep -A2 '03-FM-bashisms' "$proj/findings/$ver/$sid/hooks.log" 2>&1 || echo "(no match)"
完了して exit、./scripts/assert.sh 03。
npx claudepluginhub kazukinagata/analyzing-claude-plugin --plugin verifierProvides UI/UX resources: 50+ styles, color palettes, font pairings, guidelines, charts for web/mobile across React, Next.js, Vue, Svelte, Tailwind, React Native, Flutter. Aids planning, building, reviewing interfaces.
Searches MemPalace before answering questions about past work, people, projects, or prior decisions. Returns verbatim stored content instead of guessing from model memory.