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Re: [patch #10070] toggle invert flag when reading `!'


From: Alex fxmbsw7 Ratchev
Subject: Re: [patch #10070] toggle invert flag when reading `!'
Date: Thu, 27 May 2021 17:46:41 +0200

why doesnt it accept ! after |

On Thu, May 27, 2021, 17:38 Chet Ramey <chet.ramey@case.edu> wrote:

> On 5/27/21 11:20 AM, Andreas Schwab wrote:
> > On Mai 27 2021, Chet Ramey wrote:
> >
> >> On 5/26/21 9:55 PM, Dale R. Worley wrote:
> >>
> >>>>     $ ! ! [ 1 -eq 1 ]; echo $?
> >>>>     0
> >>> That last one isn't defined by the manual page.  I'm surprised you
> don't
> >>> get a syntax error.
> >>
> >> It's clearly valid.
> >
> > According to the POSIX grammar, a pipeline can only be a pipe_sequence
> > optionally preceded by a single Bang.  If you want another Bang the
> > pipe_sequnce needs to be either a subshell or a brace_group.
>
> True, but bash accepts it. (So do ksh and mksh; dash and yash do not.)
>
>
> --
> ``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/
>
>


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