[aequitas]

This is also my number one thing I wish I'd known about Bash. It saves on so many trivial bugs.

The documentation is especially great, for ever problem it detects you get an unique reference which you can lookup on the wiki eg: https://github.com/koalaman/shellcheck/wiki/SC2086 It then not only describes the problem but also shows different ways of solving it with some great examples and reasoning. I think I learned more Bash from Shellcheck than anywhere else.