Re: New array_expand_once option

[Chet Ramey]

On 6/14/23 5:18 PM, alex xmb ratchev wrote:

>     [[ -v a["$subscript"] ]]
>
>     is already an arithmetic expansion error in bash-5.2, but not in bash-5.1.
>
>
> hello there ..
>
> i dont get much
> it d be an arith err if array wasnt -A
> .. ?

Yes, because only one expansion is performed, and so the subscript is the
command substitution, which is not a valid arithmetic expression.

> so i shopt -s array_expand_once
> and [[ -v foo["$var"] ]]
> .. is the right way ? ( for the change , the future )

It's not as important for compound commands like [[, but for builtins like
test/[, yes, this is the way to use it.

--
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    chet@case.edu    http://tiswww.cwru.edu/~chet/