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[Bug-tar] Re: tar -tvf myarchive.zip --gunzip does not work


From: Nathan Stratton Treadway
Subject: [Bug-tar] Re: tar -tvf myarchive.zip --gunzip does not work
Date: Fri, 12 Sep 2008 11:41:09 -0400
User-agent: Mutt/1.5.13 (2006-08-11)

On Fri, Sep 12, 2008 at 09:47:14 +0530, suman wrote:
> I created the myarchive.zip using a zip utility, directly zipped; no tar is
> used here.
> 
> Now I want to use tar to unzip it. When I run above command, it ends up with
> following error:
> -------------------
> gzip: stdin has more than one entry--rest ignored
> tar: Child returned status 2
> tar: Error exit delayed from previous errors
> --------------------
> is it not allowed to list/unzip files using tar when the compression is done
> by zip? Or I need to use some other options. The Manual says with -gunzip,
> tar browse the files with gunzip for any operations like -t, -x etc.
> Even commands like following fails:
> --------------------
> tar -tvf myarchive.zip -z --gunzip
> --------------------

When you use "--gunzip", that simply causes tar to pass the input file
to "gzip" before processing it.  (You can see that the first line of the
error messages you quote is coming from "gzip" and not from "tar".)

The gzip man includes the following explanation:

    Files created by zip can be uncompressed by gzip only if  they  have  a
    single  member  compressed with the 'deflation' method. This feature is
    only intended to help conversion of tar.zip files to the tar.gz format.
    To  extract  a zip file with a single member, use a command like gunzip
    <foo.zip or gunzip -S .zip foo.zip.  To extract zip files with  several
    members, use unzip instead of gunzip.


                                                Nathan

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