[Slackbuilds-users] Using something other than bash for rc scripts?

[Didier Spaier]

More generally, as specified by POSIX:

https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_06_04

Thus most of the operations listed in
https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap01.html#tag_17_01_02_01
are available in any POSIX-compliant shell.

Also, taking the risk of beating a dead horse, I suggest using only the
features specified by POSIX, and not bash specific ones, for the sake of
portability.

Cheers,
Didier

Le 11/05/2024 à 10:04, KB_SBo a écrit :
> On 5/9/24 13:00, Charadon via SlackBuilds-users wrote:
> 
> re: bash
>> lack of simple arithmetic
> 
> 
> For integer arithmetic:
> 
> $ declare -i a=2+2
> $ echo $a
> 4
> $ let b=9+6 ; echo $b
> 15
> $ echo $((2*5+1))
> 11
> 
> or maybe use
> 
> $ expr 2 + 3
> 5
> 
> and if you want to get really fancy, use the bc command for floating 
> point, functions, loops, and algebra:
> 
> $ echo "for(i=1; i<=10; i++) {scale=4;sqrt(i);}" | bc
> 1
> 1.4142
> 1.7320
> 2.0000
> 2.2360
> 2.4494
> 2.6457
> 2.8284
> 3.0000
> 3.1622
> 
> bash shell can indeed do a bit of arithmetic, and more.
> 
> -KB
> 
> 
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