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writing-shell

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# Shell Development

In GitHub Actions, this skill owns the shell inside `run:` blocks; operating-infra owns the workflow YAML around it (jobs, permissions, actions, secrets, caching). Mixed changes use both.

## Shell Choice

- Follow the existing shebang and tooling. New portable scripts: POSIX `sh` for simple logic; Bash when you need arrays, `pipefail`, `[[ ]]`, or regex.
- Zsh and Fish only for existing files, interactive config, or explicit requests.
- Never rely on the agent's own shell. Name the shell in the shebang, and invoke it explicitly in tests.
- Shell is glue. Move data modeling, business logic, or CPU-heavy work to the project's real language.

## Safety and Portability

- Bash: `set -euo pipefail`, knowing it does not fire inside conditionals or `&&`/`||` lists. POSIX sh: `set -eu` and explicit pipeline checks.
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