shellcheck finds problems with your shell scripts

$ shellcheck my-script.sh shellcheck: oops, you can’t use in an if [ ... ]!

it checks for hundreds of common shell scripting errors

shellcheck: hey, that’s a bash- only feature but your script starts with #!/bin/sh

every shellcheck error has a number (like “SC2013”)

and the shellcheck wiki has a page for every error with examples! I’ve learned a lot from the wiki.

it even tells you about misused commands

shellcheck: hey, it looks like you’re not using grep correctly here
person: wow I’m not! thanks!

your text editor probably has a shellcheck plugin

shellcheck: I can check your shell scripts every time you save!

basically, you should probably use it

bash has too many weird edge cases for me to remember, I love that shellcheck can help me out!