tldr/pages/common/shellcheck.md

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# shellcheck
> Shell script static analysis tool.
> Check shell scripts for errors, usage of deprecated/insecure features, and bad practices.
> More information: <https://www.shellcheck.net>.
- Check a shell script:
`shellcheck {{path/to/script.sh}}`
- Check a shell script interpreting it as the specified shell dialect (overrides the shebang at the top of the script):
`shellcheck --shell {{sh|bash|dash|ksh}} {{path/to/script.sh}}`
- Ignore one or more error types:
`shellcheck --exclude {{SC1009,SC1073}} {{path/to/script.sh}}`
- Also check any sourced shell scripts:
`shellcheck --checked-sourced {{path/to/script.sh}}`
- Display output in the specified format (defaults to `tty`):
`shellcheck --format {{tty|checkstyle|diff|gcc|json|json1|quiet}} {{path/to/script.sh}}`
- Enable one or more optional checks:
`shellcheck --enable={{add-default-case|avoid-nullary-conditions}}`
- List all available optional checks that are disabled by default:
`shellcheck --list-optional`