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Zsh Compat

Category: Dev Tools  ·  Sub-category: dev-shells  ·  Last updated:
Use when generating Bash commands on macOS, when ZSH-001 hook denies a command, when "read-only variable", "no matches found", or "command not found: !" errors appear in shell output, when writing for loops over glob patterns, or when "bad math expression" errors appear from date commands. Covers read-only variables (status, pipestatus, ERRNO), glob NOMATCH protection, history expansion of the "!" operator before "[[", word splitting, array indexing, and BSD date missing `%N` nanoseconds (macOS). Keywords: zsh, NOMATCH, status variable, read-only, nullglob, glob, ZSH-001, history expansion, command not found, date, %N, nanosecond, millisecond, gdate, bad math expression.

From the source SKILL.md

Claude Code's Bash tool inherits the user's shell. On macOS (default since Catalina), that shell is zsh. Many common bash patterns silently break in zsh. This reference covers the most dangerous differences.

What this skill does

Zsh Compat 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/zsh-compat/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when generating Bash commands on macOS, when ZSH-001 hook denies a command, when "read-only variable", "no matches found", or "command not found: !" errors appear in shell output, when writing for loops over glob patterns, or when "bad math expression" errors appear from date commands. Covers read-only variables (status, pipestatus, ERRNO), glob NOMATCH protection, history expansion of the "!" operator before "[[", word splitting, array indexing, and BSD date missing `%N` nanoseconds (macOS).

Who uses this skill

The Zsh Compat 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 70,000+ 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/zsh-compat
curl -L https://claudskills.com/skills/zsh-compat/SKILL.md \
  -o ~/.claude/skills/zsh-compat/SKILL.md

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

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

Pro

One-click install via the desktop app

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Cite this skill

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

APA
ClaudSkills. (2026). Zsh Compat [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/zsh-compat/
BibTeX
@misc{zsh-compat-2026,
  author    = {ClaudSkills},
  title     = {Zsh Compat [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/zsh-compat/}
}

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