bash-defensive-patterns SKILL.md skillA

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bash-defensive-patterns from hermeticormus/libreuiux-claude-code is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

mdr add hermeticormus/libreuiux-claude-code/bash-defensive-patterns@git:20251120.288a379

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Audit grade

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Kind

SKILL.md skill

Repository

hermeticormus/libreuiux-claude-code

Path

plugins/shell-scripting/skills/bash-defensive-patterns/SKILL.md

Versions recorded

1

Latest version

git:20251120.288a379, committed Nov 20, 2025

Size

11,759 bytes

Repository stars

118

License

MIT

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.

Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.

What the file says

# 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

## Core Defensive Principles

### 1. Strict Mode
Enable bash strict mode at the start of every script to catch errors early.

```bash
#!/bin/bash
set -Eeuo pipefail  # Exit on error, unset variables, pipe failures
```

**Key flags:**
- `set -E`: Inherit ERR trap in functions
- `set -e`: Exit on any error (command returns non-zero)
- `set -u`: Exit on undefined variable reference
- `set -o pipefail`: Pipe fails if any command fails (not just last)

### 2. Error Trapping and Cleanup
Implement proper cleanup on script exit or error.

```bash
#!/bin/bash
…

Read the whole file at its exact version.

How to install

mdr add hermeticormus/libreuiux-claude-code/bash-defensive-patterns@sha256:2d999e911d499033

[![mdr](https://markdownregistry.com/badge/art_ylh4ujo6dzwxm6co.svg)](https://markdownregistry.com/a/art_ylh4ujo6dzwxm6co)

Versions

The registry has recorded 1 version of this file, committed on Nov 20, 2025.

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Source

API

GET https://markdownregistry.com/api/v1/artifacts/art_ylh4ujo6dzwxm6co
GET https://markdownregistry.com/api/v1/resolve?ref=hermeticormus/libreuiux-claude-code/bash-defensive-patterns
GET https://markdownregistry.com/api/v1/blob/2d999e911d49903368e7a25e0ca2acfb0f6ccb799113b32c6917cf4e13f8798a

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