shellcheck
shellcheck
TLDR
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
