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TAR(1)											   TAR(1)

       tar  -  tape archiver

       tar [ key ] [ name ... ]

       Tar  saves and restores files on magtape.  Its actions are controlled by the key argument.
       The key is a string of characters containing at most one function letter and possibly  one
       or  more  function  modifiers.  Other arguments to the command are file or directory names
       specifying which files are to be dumped or restored.  In all cases, appearance of a direc-
       tory name refers to the files and (recursively) subdirectories of that directory.

       The function portion of the key is specified by one of the following letters:

       r       The named files are written on the end of the tape.  The c function implies this.

       x       The  named  files are extracted from the tape.  If the named file matches a direc-
	       tory whose contents had been written onto the  tape,  this  directory  is  (recur-
	       sively) extracted.  The owner, modification time, and mode are restored (if possi-
	       ble).  If no file argument is given, the entire content of the tape is  extracted.
	       Note  that  if multiple entries specifying the same file are on the tape, the last
	       one overwrites all earlier.

       t       The names of the specified files are listed each time they occur on the tape.   If
	       no file argument is given, all of the names on the tape are listed.

       u       The named files are added to the tape if either they are not already there or have
	       been modified since last put on the tape.

       c       Create a new tape; writing begins on the beginning of the tape  instead	of  after
	       the last file.  This command implies r.

       The  following characters may be used in addition to the letter which selects the function

       0,...,7	 This modifier selects the drive on which the tape is mounted.	The default is 1.

       v	 Normally tar does its work silently.  The v (verbose) option causes it  to  type
		 the  name  of	each  file it treats preceded by the function letter.  With the t
		 function, v gives more information about the tape entries than just the name.

       w	 causes tar to print the action to be taken followed by file name, then wait  for
		 user  confirmation.  If  a  word beginning with `y' is given, the action is per-
		 formed. Any other input means don't do it.

       f	 causes tar to use the next argument as  the  name  of	the  archive  instead  of
		 /dev/mt?.   If  the  name  of	the file is `-', tar writes to standard output or
		 reads from standard input, whichever is appropriate. Thus, tar can  be  used  as
		 the head or tail of a filter chain Tar can also be used to move hierarchies with
		 the command
				  cd fromdir; tar cf - . | (cd todir; tar xf -)

       b	 causes tar to use the next argument as the blocking factor for tape records. The
		 default  is  1, the maximum is 20. This option should only be used with raw mag-
		 netic tape archives (See f above).  The block size is	determined  automatically
		 when reading tapes (key letters `x' and `t').

       l	 tells tar to complain if it cannot resolve all of the links to the files dumped.
		 If this is not specified, no error messages are printed.

       m	 tells tar to not restore the modification times.  The mod time will be the  time
		 of extraction.


       Complaints about bad key characters and tape read/write errors.
       Complaints if enough memory is not available to hold the link tables.

       There is no way to ask for the n-th occurrence of a file.
       Tape errors are handled ungracefully.
       The u option can be slow.
       The  b  option  should not be used with archives that are going to be updated. The current
       magtape driver cannot backspace raw magtape.  If the archive is	on  a  disk  file  the	b
       option should not be used at all, as updating an archive stored in this manner can destroy
       The current limit on file name length is 100 characters.

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