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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 --check-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