Apple's own documentation seems decent: https://support.apple.com/guide/terminal/toc https://support.apple.com/guide/terminal/toc and their "Shell Scripting Pr

Apple's own documentation seems decent: https://support.apple.com/guide/terminal/toc https://support.apple.com/guide/terminal/toc and their "Shell Scripting Primer" looks fairly comprehensive: https://developer.apple.com/library/archive/documentation/OpenSource/Conceptual/ShellScripting/Introduction/Introduction.html#//apple_ref/doc/uid/TP40004268-TP40003516-SW1 https://developer.apple.com/library/archive/documentation/Op...