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

From: Andreas Schwab
Subject: Re: [patch #10070] toggle invert flag when reading `!'
Date: Thu, 27 May 2021 17:20:00 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.2 (gnu/linux)

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.


Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
"And now for something completely different."

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