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TAR(1)											   TAR(1)

NAME
       tar - tape archiver

SYNOPSIS
       tar [ key ] [ name ... ]

DESCRIPTION
       Tar  saves  and	restores multiple files on a single file (usually a magnetic tape, but it
       can be any file).  Tar's 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 tar are file or directory names specifying which	files  to
       dump  or  restore.   In	all cases, appearance of a directory 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
       desired.

       o	 On  output, tar normally places information specifying owner and modes of direc-
		 tories in the archive.  Former versions of tar, when encountering this  informa-
		 tion will give error message of the form
		      "<name>/: cannot create".
		 This modifier will suppress the directory information.

       p	 This  modifier  says  to  restore  files  to  their original modes, ignoring the
		 present umask(2).  Setuid and sticky information will also be	restored  to  the
		 super-user.

       0, ..., 9 This  modifier  selects  an  alternate  drive on which the tape is mounted.  The
		 default is drive 0 at 1600 bpi, which is normally /dev/rmt8.

       v	 Normally tar does its work silently.  The v (verbose) option makes tar print the
		 name  of  each file it treats preceded by the function letter.  With the t func-
		 tion, the verbose option gives more information about the tape entries than just
		 their names.

       w	 Tar prints the action to be taken followed by file name, then wait for user con-
		 firmation. If a word beginning with `y' is given, the action is done. Any  other
		 input means don't do it.

       f	 Tar  uses  the next argument as the name of the archive instead of /dev/rmt?. If
		 the name of the file is `-', tar writes to standard output or reads  from  stan-
		 dard  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	 Tar uses the next argument as the blocking factor for tape records. The  default
		 is  20 (the maximum). This option should only be used with raw magnetic tape ar-
		 chives (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 not to restore the modification times.  The modification time will  be
		 the time of extraction.

       h	 Force	tar to follow symbolic links as if they were normal files or directories.
		 Normally, tar does not follow symbolic links.

       B	 Forces input and output blocking to 20 blocks per record.  This option was added
		 so  that tar can work across a communications channel where the blocking may not
		 be maintained.

       C	 If a file name is preceded by -C, then tar will perform a chdir(2) to that  file
		 name.	 This allows multiple directories not related by a close common parent to
		 be archived using short relative path names.  For example, to archive files from
		 /usr/include and from /etc, one might use
		      tar c -C /usr include -C / etc

       Previous  restrictions  dealing	with  tar's inability to properly handle blocked archives
       have been lifted.

FILES
       /dev/rmt?
       /tmp/tar*

SEE ALSO
       tar(5)

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

BUGS
       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 current limit on file name length is 100 characters.
       There is no way selectively to follow symbolic links.
       When extracting tapes created with the r or u options, directory  modification  times  may
       not be set correctly.

7th Edition				   May 12, 1986 				   TAR(1)
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