bash
Use when: write or review robust shell scripts that fail fast and handle paths and input safely.
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- kimtth/agent-skill-100-lines-or-less
- Last source activity
- June 26, 2026 at 02:15
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- English
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- bash
- description
- Use when: write or review robust shell scripts that fail fast and handle paths and input safely.
Goal: shell scripts that are safe, portable, and fail loudly.
Use for:
- automation, CI steps, and glue scripts
- reviewing fragile or unsafe shell code
- hardening scripts against edge cases
Workflow:
1. Start with set -euo pipefail for strict failure.
2. Quote every variable expansion: "$var", "${arr[@]}".
3. Check for required commands and inputs up front.
4. Use functions and local variables for structure.
5. Prefer printf over echo for predictable output.
6. Verify with shellcheck and a dry run.
Idioms:
- "${var:-default}" for fallbacks
- [[ ... ]] over [ ... ] for tests
- trap for cleanup on exit
- mktemp for temporary files
Rules:
- always quote expansions to survive spaces and globs
- set -euo pipefail unless you have a reason not to
- validate inputs before destructive actions
- run shellcheck; treat its findings as real bugs
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