(tar.info.gz) appending files

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 4.2.2.1 Appending Files to an Archive
 .....................................
 
 The simplest way to add a file to an already existing archive is the
 '--append' ('-r') operation, which writes specified files into the
 archive whether or not they are already among the archived files.
 
    When you use '--append', you _must_ specify file name arguments, as
 there is no default.  If you specify a file that already exists in the
 archive, another copy of the file will be added to the end of the
 archive.  As with other operations, the member names of the newly added
 files will be exactly the same as their names given on the command line.
 The '--verbose' ('-v') option will print out the names of the files as
 they are written into the archive.
 
    '--append' cannot be performed on some tape drives, unfortunately,
 due to deficiencies in the formats those tape drives use.  The archive
 must be a valid 'tar' archive, or else the results of using this
 operation will be unpredictable.   Media.
 
    To demonstrate using '--append' to add a file to an archive, create a
 file called 'rock' in the 'practice' directory.  Make sure you are in
 the 'practice' directory.  Then, run the following 'tar' command to add
 'rock' to 'collection.tar':
 
      $ tar --append --file=collection.tar rock
 
 If you now use the '--list' ('-t') operation, you will see that 'rock'
 has been added to the archive:
 
      $ tar --list --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
 
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