Re: case $var in $list) issue

[#!microsuxx]

On Fri, Nov 1, 2024, 15:49 Chet Ramey <chet.ramey@case.edu> wrote:

> On 11/1/24 7:15 AM, Greg Wooledge wrote:
> > On Fri, Nov 01, 2024 at 06:00:49 +0100, #!microsuxx wrote:
> >> shopt -s extglob
> >> m='@(a|b)' ; case b in $m) echo ye ; esac
> >> ye
> >
> > Huh, interesting indeed.
>
> It's really not.
>
>
> > hobbit:~$ shopt -s extglob
> > hobbit:~$ m='a|b'
> > hobbit:~$ case b in $m) echo ye ; esac
> > hobbit:~$ m='@(a|b)'
> > hobbit:~$ case b in $m) echo ye ; esac
> > ye
> >
> > I can only speculate that it sometimes re-parses the contents of $m
> > based on the first character.
>
> The case statement has a pattern list with a single element, $m, which
> expands to a single unquoted extglob pattern, @(a|b).
>
> The case statement tries to match b against that pattern, and, since
> extglob is enabled, it matches.
>
very good !!

greets ..

>
> --
> ``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/
>