this post was submitted on 26 Aug 2023
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How do you shell expand your variables and why? (lemmy.world)
submitted 1 year ago by zephyr@lemmy.world to c/programming@programming.dev
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[–] gamma@programming.dev 1 points 1 year ago (2 children)

This has never stuck with me, and I hadn't thought about why until now. I have two reasons why I will always write ${x}_$y.z instead of ${x}_${y}.z:

  • Syntax highlighting and shellcheck have always caught the cases I need to add braces to prevent $x_ being expanded as ${x_}.
  • I write a lot of Zsh. In Zsh, braces are optional in way more cases. "$#array[3]" actually prints the length of the third item in array, rather than (Bash:) the number of positional parameters, then the string 'array[3]'.
[–] thingsiplay@kbin.social 3 points 1 year ago

@gamma I just use them out of consistency and principle, so I don't need to think in which case it is required or not.

[–] cyclohexane@lemmy.ml 0 points 1 year ago

I will always write ${x}_$y.z instead of ${x}_${y}.z:

The difference between the two seems different to what's in the OP. Is there a typo here?