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

From: Gary Johnson
Subject: bug#57604: [ef]grep usage -> POSIXLY_CORRECT?
Date: Wed, 7 Sep 2022 05:36:10 -0700
User-agent: Mutt/1.5.20 (2009-06-14)

On 2022-09-07, Simon Josefsson via Bug reports for GNU grep wrote:

> Personally, I'd rather have tools exit with an error code on invalid
> uses rather than issuing warning messages.

The warning messages are merely annoying.  Returning a non-zero exit
status would break scripts, and in many cases, silently.


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