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Bash Anti Patterns

Category: Dev Tools  ·  Sub-category: dev-shells  ·  Last updated:
lang:pythontool:terraform
識別與避免 Claude Code agent 下 bash 指令的三層防線：(1) Anti-Pattern 1 過度複雜單行（多行 heredoc、巢狀引號、內嵌 Python -c / Node -e、複雜 if/elif、 for-loop-file-list），(2) Anti-Pattern 2 bash 字串內特殊 Unicode（em dash、 en dash、emoji），(3) Anti-Pattern 3 stateful cd（CWD 污染 / cd-before-git / cd + 2>/dev/null 路徑隱藏）。另含 Rule 14 shell 引號衛生（simple_expansion / 同型引號衝突 / grep BRE alternation / 反向巢狀 subshell / expansion false positive）與 Rule 15 不可逆操作邊界（alembic migrate / terraform apply / git push --force / rm -rf / kubectl apply）。觸發情境：parser 錯誤「Unhandled node type: string」「Contains simple_expansion」「Contains expansion」「Newline followed by # inside quoted argument」、「bash heredoc 失敗」、「cd 會污染 CWD」、 「stateful cd」、「不可逆操作要不要執行」、「terraform apply 確認」、「git push --force 安全嗎」、agent 自我反省「這段 bash 太複雜」「要不要寫成 script」 「cd 指令要不要改成 --directory」時。
Security BStatic scan: minor findingsHow grading works ›

From the source SKILL.md

This skill provides a systematic set of bash command conventions to prevent parser failures from disrupting your workflow, and to set autonomy boundaries for irreversible operations. The three rule files can be enabled independently.

What this skill does

Bash Anti Patterns is a community-contributed Claude Code skill in the dev-shells sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/bash-anti-patterns/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Bash Anti Patterns Claude Code skill is built for developers, power users, and teams automating repetitive workflows and improving developer experience. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 168,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/bash-anti-patterns
curl -L https://claudskills.com/skills/bash-anti-patterns/SKILL.md \
  -o ~/.claude/skills/bash-anti-patterns/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/bash-anti-patterns/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/bash-anti-patterns/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\bash-anti-patterns\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Telegram

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Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

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Frequently asked questions

How do I install the Bash Anti Patterns Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/bash-anti-patterns/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Bash Anti Patterns skill do?
識別與避免 Claude Code agent 下 bash 指令的三層防線：(1) Anti-Pattern 1 過度複雜單行（多行 heredoc、巢狀引號、內嵌 Python -c / Node -e、複雜 if/elif、 for-loop-file-list），(2) Anti-Pattern 2 bash 字串內特殊 Unicode（em dash、 en dash、emoji），(3) Anti-Pattern 3 stateful cd（CWD 污染 / cd-before-git / cd + 2>/dev/null 路徑隱藏）。另含 Rule 14 shell 引號衛生（simple_expansion / 同型引號衝突 / grep BRE alternation / 反向巢狀 subshell / expansion false positive）與 Rule 15 不可逆操作邊界（alembic migrate / terraform apply / git push --force / rm -rf / kubectl apply）。觸發情境：parser 錯誤「Unhandled node type: string」「Contains simple_expansion」「Contains expansion」「Newline followed by # inside quoted argument」、「bash heredoc 失敗」、「cd 會污染 CWD」、 「stateful cd」、「不可逆操作要不要執行」、「terraform apply 確認」、「git push --force 安全嗎」、agent 自我反省「這段 bash 太複雜」「要不要寫成 script」 「cd 指令要不要改成 --directory」時。
Is this skill free to install?
Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.
When should I use the Bash Anti Patterns skill?
Use Bash Anti Patterns when your Claude Code task falls under the Dev Tools category — specifically in the dev shells area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Bash Anti Patterns" or describe the task and let Claude pick). Browse related skills at /category/tools/.
What is a Claude Code skill and how does the Bash Anti Patterns skill fit in?
A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Bash Anti Patterns is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Dev Tools category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA
heyu-ai. (2026). Bash Anti Patterns [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/bash-anti-patterns/
BibTeX
@misc{bash-anti-patterns-2026,
  author    = {heyu-ai},
  title     = {Bash Anti Patterns [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/bash-anti-patterns/}
}

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Security scan

Grade B · scanned 2026-07-31 — free static scan against the OWASP Agentic Skills Top 10.

The scan flagged 1 of 10 categories (filesystem), including a high-severity pattern. Patterns shown inside code fences are weighted as examples rather than instructions — read the grading methodology for what this does and does not guarantee.

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