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ShellCheck made me confident enough to write more complex bash scripts. Highly recommend! Works great with emacs + flycheck.

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It is also a quite nice tool for checking the POSIX compatibility of shell scripts. I find it very useful when working on Solaris or some other UNIX that does not use Bash by default.

Same here, I basically learned how to write POSIX-compliant Shell with the help of ShellCheck. Shell is not a difficult language to learn but it definitely has its oddities and the different flavours (Bash etc.) only add to the confusion.

What people don't always expect is the immense portability that POSIX-compliant Shell offers you. This thing runs on pretty much everything.

Another tool for that is checkbashisms from the Debian devscripts package:

https://manpages.debian.org/checkbashisms

haskell forbidding people to leave fragile bash to learn babashka !

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