bug#32815: Corrective patch for GNU gzip

[Paul Eggert]

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
> Test:
> $ gzip 2018.gz
> gzip: 2018.gz already has .gz suffix -- unchanged
> $ echo $?
> 0

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