this post was submitted on 27 Mar 2024
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Are you sure it doesn't work on zsh? It's valid POSIX shell code, and like bash, zsh is a superset of POSIX, at least if I remember correctly.
This is not to goad you into destroying your filesystem. Replace the
rm
with something relatively harmless likeecho "BANG! You're dead!"
if you decide to test it.Key here is the outer [] and interaction of $[], test doesn't have == by default in standard posix, so no this isn't posix shell or bourne compatible. Tis but another bashism. I could probably force zsh into a more bourne mode to try it but its definitely not portable bourne shell its bash.
== should be -eq for this to be posix/bourne portable, you could use = but -eq is for numeric comparisons so not quite right.