Re: Difference of extglob between 5.0.0(1)-release and 4.4.23(1)-release

[Ilkka Virta]

On 13.1. 14:37, Andreas Schwab wrote:
> On Jan 13 2019, Robert Elz <kre@munnari.OZ.AU> wrote:
>
> > The pattern
> >         ./$null"$dir"/
> >
> > is expanded (parameter expansion) to
> >
> >         ./@()./
> >
> > which does not have a "." immediately after the / and
> > tus cannot match any filename (incoludeing ".") which
> > starts with a '.' character.
>
> For the same reason `*.' doesn't match `.'.  Making `@()' work differently
> from `*' would be surprising.

However,  ?(aa).foo  matches the file  .foo  in Bash 4.4 and 5.0 (and 
also in Ksh and Zsh), so extglob already breaks the above mentioned rule.

  $ touch .foo aa.foo; bash -O extglob -c 'echo ?(aa).foo'
  aa.foo .foo


The change in Bash 5.0 also makes  @(aa|)  different from  ?(aa) , even 
though the distinction between those two doesn't appear immediately 
obvious.


--
Ilkka Virta / itvirta@iki.fi