Re: $${a,b} brace expansion flaw.

[Lawrence Velázquez]

On Sat, Jan 20, 2024, at 2:43 AM, Kaz Kylheku wrote:
> Someone just posted this finding on Stackoverflow:
>
> https://stackoverflow.com/questions/77850130/bash-parse-of-x-y
>
> When brace expansion is adjacent to $$, it doesn't expand.
>
> Try
>
>    echo $${a,b}
>    echo $$-{a,b}
>
> Documented somewhere? Or bug?

The manual says:

        To avoid conflicts with parameter expansion, the string
        `${' is not considered eligible for brace expansion, and
        inhibits brace expansion until the closing `}'.

https://www.gnu.org/software/bash/manual/html_node/Brace-Expansion.html

-- 
vq