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touch -- change file access and modification times


     touch [-acfhm] [-r file] [-t [[CC]YY]MMDDhhmm[.SS]] file ...


     The touch utility sets the modification and access times of files to the
     current time of day.  If the file doesn't exist, it is created with
     default permissions.

     The following options are available:

     -a      Change the access time of the file.  The modification time of the
	     file is not changed unless the -m flag is also specified.

     -c      Do not create the file if it does not exist.  The touch utility
	     does not treat this as an error.  No error messages are displayed
	     and the exit value is not affected.

     -f      Attempt to force the update, even if the file permissions do not
	     currently permit it.

     -h      If the file is a symbolic link, change the times of the link
	     itself rather than the file that the link points to.  Note that
	     -h implies -c and thus will not create any new files.

     -m      Change the modification time of the file.	The access time of the
	     file is not changed unless the -a flag is also specified.

     -r      Use the access and modifications times from the specified file
	     instead of the current time of day.

     -t      Change the access and modification times to the specified time.
	     The argument should be in the form ``[[CC]YY]MMDDhhmm[.SS]''
	     where each pair of letters represents the following:

		   CC	   The first two digits of the year (the century).
		   YY	   The second two digits of the year.  If ``YY'' is
			   specified, but ``CC'' is not, a value for ``YY''
			   between 69 and 99 results in a ``CC'' value of 19.
			   Otherwise, a ``CC'' value of 20 is used.
		   MM	   The month of the year, from 1 to 12.
		   DD	   the day of the month, from 1 to 31.
		   hh	   The hour of the day, from 0 to 23.
		   mm	   The minute of the hour, from 0 to 59.
		   SS	   The second of the minute, from 0 to 61.

	     If the ``CC'' and ``YY'' letter pairs are not specified, the val-
	     ues default to the current year.  If the ``SS'' letter pair is
	     not specified, the value defaults to 0.


     The touch utility exits 0 on success, and >0 if an error occurs.


     The ``MM'', ``DD'', ``hh'' and ``mm'' letter pairs are treated as their
     counterparts specified to the -t option.  If the ``YY'' letter pair is in
     the range 39 to 99, the year is set to 1939 to 1999, otherwise, the year
     is set in the 21st century.


     A touch utility appeared in Version 7 AT&T UNIX.


     The touch utility is expected to be a superset of the IEEE Std 1003.2
     (``POSIX.2'') specification.

FreeBSD 5.4			April 28, 1995			   FreeBSD 5.4


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