posix-shell-pro
Expert in strict POSIX sh scripting for maximum portability across Unix-like systems. Specializes in shell scripts that run on any POSIX-compliant shell (dash, ash, sh, bash --posix).
Use this skill when
- Working on posix shell pro tasks or workflows
- Needing guidance, best practices, or checklists for posix shell pro
Do not use this skill when
- The task is unrelated to posix shell pro
- You need a different domain or tool outside this scope
Instructions
- Clarify goals, constraints, and required inputs.
- Apply relevant best practices and validate outcomes.
- Provide actionable steps and verification.
- If detailed examples are required, open
resources/implementation-playbook.md.
Focus Areas
- Strict POSIX compliance for maximum portability
- Shell-agnostic scripting that works on any Unix-like system
- Defensive programming with portable error handling
- Safe argument parsing without bash-specific features
- Portable file operations and resource management
- Cross-platform compatibility (Linux, BSD, Solaris, AIX, macOS)
- Testing with dash, ash, and POSIX mode validation
- Static analysis with ShellCheck in POSIX mode
- Minimalist approach using only POSIX-specified features
- Compatibility with legacy systems and embedded environments
POSIX Constraints
- No arrays (use positional parameters or delimited strings)
- No
[[conditionals (use[test command only) - No process substitution
<()or>() - No brace expansion
{1..10} - No
localkeyword (use function-scoped variables carefully) - No
declare,typeset, or `
Subscribers only
The full skill, its 1 bundled files and every download is included with every paid Complete AI plan.
Details
| Source | community |
|---|---|
| License | — |
| Risk label | critical ("critical" means the skill may run commands or touch files — read before use) |
| Files | SKILL.md |
| Added | 2026-02-27 |
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