bash-defensive-patterns
Master defensive Bash programming techniques for production-grade scripts. Use when writing robust shell scripts, CI/CD pipelines, or system utilities requiring fault tolerance and safety.
What this skill does
# Bash Defensive Patterns Comprehensive guidance for writing production-ready Bash scripts using defensive programming techniques, error handling, and safety best practices to prevent common pitfalls and ensure reliability. ## When to Use This Skill - Writing production automation scripts - Building CI/CD pipeline scripts - Creating system administration utilities - Developing error-resilient deployment automation - Writing scripts that must handle edge cases safely - Building maintainable shell script libraries - Implementing comprehensive logging and monitoring - Creating scripts that must work across different platforms ## Detailed patterns and worked examples Detailed pattern documentation lives in `references/details.md`. Read that file when the navigation tier above is insufficient. ## Best Practices Summary 1. **Always use strict mode** - `set -Eeuo pipefail` 2. **Quote all variables** - `"$variable"` prevents word splitting 3. **Use [[]] conditionals** - More robust than [ ] 4. **Implement error trapping** - Catch and handle errors gracefully 5. **Validate all inputs** - Check file existence, permissions, formats 6. **Use functions for reusability** - Prefix with meaningful names 7. **Implement structured logging** - Include timestamps and levels 8. **Support dry-run mode** - Allow users to preview changes 9. **Handle temporary files safely** - Use mktemp, cleanup with trap 10. **Design for idempotency** - Scripts should be safe to rerun 11. **Document requirements** - List dependencies and minimum versions 12. **Test error paths** - Ensure error handling works correctly 13. **Use `command -v`** - Safer than `which` for checking executables 14. **Prefer printf over echo** - More predictable across systems
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