Shell Script Hardening Toolkit

Every developer writes shell scripts. Most are fragile — they break on spaces in filenames, fail silently, leave temp files everywhere, and leak secrets in logs. This 13KB skill gives your agent the complete playbook for writing bulletproof bash scripts.

Includes: hardened preamble (set -euo pipefail + logging), cleanup traps, robust argument parsing, variable quoting rules, cross-platform portability (Linux/macOS/Docker), retry with exponential backoff, file locking for cron safety, security patterns (secret handling, input sanitization, privilege management), debug/dry-run modes, a full audit checklist, 9 common antipatterns with fixes, and a complete production-ready template.

Zero dependencies. Works with bash, sh, and zsh. Covers CI/CD scripts, cron jobs, deploy automation, and any shell-based tooling. Every pattern is copy-paste ready with clear explanations of why it matters.