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bug#32815: Corrective patch for GNU gzip

From: Paul Eggert
Subject: bug#32815: Corrective patch for GNU gzip
Date: Sun, 23 Sep 2018 18:42:22 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1

Manfred Morgner wrote:
Hello all,
the manual page of GNU gzip says:
Exit status is normally 0; if an error occurs, exit status is 1. If a warning 
occurs, exit status is 2.
This is not the case sind version >1.5 for the situation when the source file 
already ends with .gz
$ gzip 2018.gz
gzip: 2018.gz already has .gz suffix -- unchanged
$ echo $?

Why is this a bug? Arguably no error has occurred.

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