Posix Shell Pro
When you need shell scripts that run anywhere,Alpine containers, ancient Solaris boxes, embedded systems, wherever,this is your go-to. It enforces strict POSIX sh compliance, so no arrays, no bash-isms, no `[[` conditionals. You get patterns for working around those limitations: positional parameters instead of arrays, `case` for pattern matching, `printf` instead of echo. It's opinionated about safety too: quote everything, use traps for cleanup, validate with explicit checks. The real value is in the constraints section and workarounds, which save you from debugging why your script breaks on dash or BusyBox ash. Worth it if portability actually matters for your use case.
- skills.sh installs
- 250
- GitHub stars
- 39.4K
- last updated
- Jun 3, 2026
Install
$ npx -y skills add sickn33/antigravity-awesome-skills --skill posix-shell-pro --agent claude-codeInstalls into .claude/skills of the current project.
Files
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.
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
Sponsors
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- Repository
- github.com/sickn33/antigravity-awesome-skills
- Category
- CLI & Terminal
- First seen
- Jun 3, 2026
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