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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: [found the culprit]
Date: Wed, 14 Nov 2018 18:09:09 +0200
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In-reply-to: <8736s3pslm.fsf@mat.ucm.es> (message from Uwe Brauer on Wed, 14
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> From: Uwe Brauer <oub@mat.ucm.es>
> Date: Wed, 14 Nov 2018 16:49:09 +0100
> 
>    > I do think that Z on a compressed Tar archive, be it a .tar.gz or
>    > .tgz file, should not by default unpack the archive. We could have
>    > a special prefix arg to request that, and by default we should just
>    > uncompress the file. But that's a different issue.
> 
> So I am confused now. What is you personal preference?
> 
>   Z: tgz (tar.gz)--> tar
> 
> Or 
> 
>  Z: tgz (tar.gz)--> unpack

The former by default, the latter optionally.