Test If Your Shell Scripts Are POSIX Compliant with ShellCheck

You can do this with the --shell sh flag even if your shebang is set to bash.

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0:00 -- Intro
0:08 -- Two conditions, one is POSIX compliant and the other is not
0:38 -- We can use the --shell sh flag with ShellCheck
1:10 -- It's useful to ensure compatibility when you want it
2:18 -- The shorthand flag is -s sh