Shell Scripting

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submitted 1 week ago by MonkderVierte@lemmy.zip to c/shell@programming.dev

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I've seen : "${DB_HOST:=localhost}" because it assigns the variable if not set (: $… is just to run assignments standalone).

But that has the same effect like DB_HOST="${DB_HOST:-localhost} (use the string if not set), which is more readable.

While something like echo "${DB_HOST:=localhost}" smells from a mile, because it has output with side-effects.

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[–] onlinepersona@programming.dev 2 points 1 week ago

I'd you're concerned about this, it's up to you to change your bash script style.

Use "set -euo pipefail" and don't use ": =". You can't stop others from doing so though. It's their code, their choice.

I never use ": =" in bash though.