For those looking for learning resources, here are some I've found useful:

The Advanced Bash Scripting Guide[0]

Classic Shell Scripting[1]

Google Shell Style Guide[2]

Wicked Cool Shell Scripts[3]

GNU Bash Manual[4]

0. https://tldp.org/LDP/abs/html/

1. https://www.goodreads.com/book/show/299533.Classic_Shell_Scr...

2. https://google.github.io/styleguide/shellguide.html

3. https://nostarch.com/wcss2

4. https://www.gnu.org/software/bash/manual/