I guess that I need to state that the most of this stuff is intended for the bash shell. I don't know many people that use csh/tcsh anyway :/
That wasn't clear, especially after the first part which recommended to use #!/bin/sh...
Gonna address that later, thanks for the advice! I've never used BSD nor csh before, so I'm not that familiar with differences between distros and shells, as I'm almost exclusively using bash/zsh for my job.
This table might help. The ksh (AIX/OpenBSD default shell) does not differ that much from POSIX, the csh does.
zsh: massive extensions on top of sh but different ones to bash
csh: a completely different shell to sh, contemporary in origin, mostly different syntax
tcsh: extensions on top of csh
fish: a completely different shell again, cut-down syntax and features mostly targeted at interactive users
So, yeah, it's important to specify which shell you're targeting.
Thanks for the info. I've updated the posts with shell reqs. 😊
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