this post was submitted on 02 Nov 2023
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Ash Vs Bash (lemmy.ca)
submitted 1 year ago by danielquinn@lemmy.ca to c/linux@lemmy.ml
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[For reference, I'm talking about Ash in Alpine Linux here, which is part of BusyBox.]

I thought I knew the big differences, but it turns out I've had false assumptions for years. Ash does support [[ double square brackets ]] and (as best I can tell) all of Bash's logical trickery inside them. It also supports ${VARIABLE_SUBSTRINGS:5:12}` which was another surprise.

At this stage, the only things I've found that Bash can do that Ash can't are:

  • Arrays, which Bash doesn't seem to do well anyway
  • Brace expansion, which is awesome but I can live without it.

What else is there? Did Ash used to be more limited? The double square bracket thing really surprised me.

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[–] suprjami@lemmy.sdf.org 11 points 1 year ago

If you run your scripts through https://shellcheck.net it'll pick up things like this. Also available as a Linux package for offline use.