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Like programming in bash (lemmy.ml)

submitted 1 month ago by yogthos@lemmy.ml to c/programmerhumor@lemmy.ml

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[-] fallingcats@discuss.tchncs.de 7 points 1 month ago

But, but like ... hear me out.

echo $((1+1))

[-] Dirk@lemmy.ml 1 points 4 weeks ago

That is a posixly correct method to do arithmetic expressions.

[-] fallingcats@discuss.tchncs.de 1 points 4 weeks ago

Huh, seems you're right. I was under the impression this wouldn't work in dash but apparently that's wrong.

[-] Dirk@lemmy.ml 1 points 4 weeks ago

Yep! The functionality for performing arithmetic expressions this way is called “arithmetic expansion”.

2.6.4 Arithmetic Expansion

Arithmetic expansion provides a mechanism for evaluating an arithmetic expression and substituting its value. The format for arithmetic expansion shall be as follows:

$((expression))

The expression shall be treated as if it were in double-quotes, except that a double-quote inside the expression is not treated specially. The shell shall expand all tokens in the expression for parameter expansion, command substitution, and quote removal.

Next, the shell shall treat this as an arithmetic expression and substitute the value of the expression. […]

https://pubs.opengroup.org/onlinepubs/9799919799/utilities/V3_chap02.html#tag_19_06_04

this post was submitted on 05 Mar 2025

195 points (99.5% liked)

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