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