developing-simple-posix-shell-scripts skill

This skill defines guidelines for writing simple POSIX shell scripts: ad-hoc tasks, short wrappers, linear logic, or init-style scripts that do not need full CLI scaffolding.

Prioritise correctness, brevity, and portability. Do NOT pad simple scripts with template boilerplate.

If a script grows beyond ~50 lines, needs 3+ flags, or involves complex control flow, switch to the developing-complex-posix-shell-scripts skill instead.

When to Use This Skill

• Ad-hoc or one-off automation tasks targeting /bin/sh
• Portable wrappers intended to run on Alpine, BusyBox, or other minimal environments
• Basic init scripts or simple file operations
• Scripts expected to stay under ~50 lines
• No need for --help, structured logging, or multiple named flags

Core Requirements

Shebang & Safety Modes