Re: why fail , [[ $sep$*$sep == $sep--$sep ]]

[Kerin Millar]

On Tue, 20 Feb 2024 10:34:43 -0500
Chet Ramey <chet.ramey@case.edu> wrote:

> On 2/17/24 10:07 AM, alex xmb sw ratchev wrote:
> > i was trying and epic failed
> > 
> > set aa bb cc -- dd ; f=$'\1' IFS=$f ; [[ $f$*$f == "$f--$f" ]] && echo ye
> > 
> > it says no ye
> 
> It looks like you've found a bug that manifests itself under a very
> specific set of circumstances: IFS=$'\1', word splitting not performed,
> and an unquoted word. Bash doesn't quote the ^A sufficiently, and since
> it uses ^A as an internal quote character, removes it. This causes the
> match to fail. There are other places this happens: case commands, shell
> pattern expansion, and array subscript expansion.
> 
> I pushed a fix for it this morning; there is another change in the
> pipeline.

Thanks.

-- 
Kerin Millar