Some POSIX #ShellScripting resources I've had bookmarked since before the question #WhyTheFuckDoesAIHaveToRuinEverything needed to be asked:
Rich’s sh (POSIX shell) tricks: https://www.etalabs.net/sh_tricks.html
GitHub - dylanaraps/pure-sh-bible: 📖 A collection of pure POSIX sh alternatives to external processes. · GitHub: https://github.com/dylanaraps/pure-sh-bible
POSIX Shell Tutorial: https://www.grymoire.com/Unix/Sh.html
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