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bug#57604: [ef]grep usage -> POSIXLY_CORRECT?

From: Simon Josefsson
Subject: bug#57604: [ef]grep usage -> POSIXLY_CORRECT?
Date: Wed, 07 Sep 2022 10:02:04 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux)

Paul Eggert via Bug reports for GNU grep <bug-grep@gnu.org> writes:

> $ grep '\Q' /dev/null
> grep: warning: stray \ before Q
> $ grep '[:alpha:]' /dev/null
> grep: character class syntax is [[:space:]], not [:space:]

Is the use of diagnostic warnings like this supported by POSIX?
Personally, I'd rather have tools exit with an error code on invalid
uses rather than issuing warning messages.


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