this post was submitted on 27 Mar 2024
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    submitted 8 months ago by Pantherina@feddit.de to c/linuxmemes@lemmy.world
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    [–] palordrolap@kbin.social 4 points 8 months ago (1 children)

    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 like echo "BANG! You're dead!" if you decide to test it.

    [–] mitchty@lemmy.sdf.org 1 points 8 months ago* (last edited 8 months ago)

    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.

    $ [ $[ $RANDOM % 6 ] == 0 ] && echo rm || echo ok
zsh: = not found
$ zsh --version
zsh 5.9 (x86_64-pc-linux-gnu)

    == should be -eq for this to be posix/bourne portable, you could use = but -eq is for numeric comparisons so not quite right.