(tar.info.gz) multiple

Info Catalog (tar.info.gz) appending files (tar.info.gz) append
 
 4.2.2.2 Multiple Members with the Same Name
 ...........................................
 
 You can use '--append' ('-r') to add copies of files which have been
 updated since the archive was created.  (However, we do not recommend
 doing this since there is another 'tar' option called '--update'; 
 update, for more information.  We describe this use of '--append' here
 for the sake of completeness.)  When you extract the archive, the older
 version will be effectively lost.  This works because files are
 extracted from an archive in the order in which they were archived.
 Thus, when the archive is extracted, a file archived later in time will
 replace a file of the same name which was archived earlier, even though
 the older version of the file will remain in the archive unless you
 delete all versions of the file.
 
    Supposing you change the file 'blues' and then append the changed
 version to 'collection.tar'.  As you saw above, the original 'blues' is
 in the archive 'collection.tar'.  If you change the file and append the
 new version of the file to the archive, there will be two copies in the
 archive.  When you extract the archive, the older version of the file
 will be extracted first, and then replaced by the newer version when it
 is extracted.
 
    You can append the new, changed copy of the file 'blues' to the
 archive in this way:
 
      $ tar --append --verbose --file=collection.tar blues
      blues
 
 Because you specified the '--verbose' option, 'tar' has printed the name
 of the file being appended as it was acted on.  Now list the contents of
 the archive:
 
      $ tar --list --verbose --file=collection.tar
      -rw-r--r-- me/user          28 1996-10-18 16:31 jazz
      -rw-r--r-- me/user          21 1996-09-23 16:44 blues
      -rw-r--r-- me/user          20 1996-09-23 16:44 folk
      -rw-r--r-- me/user          20 1996-09-23 16:44 rock
      -rw-r--r-- me/user          58 1996-10-24 18:30 blues
 
 The newest version of 'blues' is now at the end of the archive (note the
 different creation dates and file sizes).  If you extract the archive,
 the older version of the file 'blues' will be replaced by the newer
 version.  You can confirm this by extracting the archive and running
 'ls' on the directory.
 
    If you wish to extract the first occurrence of the file 'blues' from
 the archive, use '--occurrence' option, as shown in the following
 example:
 
      $ tar --extract -vv --occurrence --file=collection.tar blues
      -rw-r--r-- me/user          21 1996-09-23 16:44 blues
 
     Writing, for more information on '--extract' and see 
 -occurrence Option Summary, for a description of '--occurrence' option.
 
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