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
3 comments fedilink hide all child comments
 

[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 0 points 1 year ago* (last edited 1 year ago) (2 children)

What have you found bad about bash arrays? I have some simple usage of those (in bash) and they work fine.

[–] danielquinn@lemmy.ca 0 points 1 year ago (1 children)

As far as I've seen, they don't provide any advantage over a string with spaces, which doesn't work well either when you've got values with spaces:

not_what_you_think=( "a b" "c" "d" )
for sneaky in ${not_what_you_think[@]}; do
  echo "This is sneaky: ${sneaky}"
done

This is sneaky: a
This is sneaky: b
This is sneaky: c
This is sneaky: d
[–] shmanio@lemmy.world 1 points 1 year ago* (last edited 7 months ago)

You should put some quotes where you use the array:

not_what_you_think=( "a b" "c" "d" )
for sneaky in "${not_what_you_think[@]}"; do
  echo "This is sneaky: ${sneaky}"
done

This is sneaky: a b
This is sneaky: c
This is sneaky: d