TAR(1)							      General Commands Manual							    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 directory whose contents had been written onto the  tape,
	       this directory is (recursively) extracted.  The owner, modification time, and mode are restored (if possible).  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 directories in the archive.	Former	versions  of  tar,
		 when encountering this information 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 function, 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 confirmation. 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 stan-
		 dard 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	 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 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 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)