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TOUCH(1)		  BSD General Commands Manual		      TOUCH(1)

     touch -- change file access and modification times

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

     The touch utility sets the	modification and access	times of files.	 If
     any file does not exist, it is created with default permissions.

     By	default, touch changes both modification and access times.  The	-a and
     -m	flags may be used to select the	access time or the modification	time
     individually.  Selecting both is equivalent to the	default.  By default,
     the timestamps are	set to the current time.  The -t flag explicitly spec-
     ifies a different time, and the -r	flag specifies to set the times	those
     of	the specified file.  The -A flag adjusts the values by a specified

     The following options are available:

     -A	     Adjust the	access and modification	time stamps for	the file by
	     the specified value.  This	flag is	intended for use in modifying
	     files with	incorrectly set	time stamps.

	     The argument is of	the form "[-][[hh]mm]SS" where each pair of
	     letters represents	the following:

		   -	   Make	the adjustment negative: the new time stamp is
			   set to be before the	old one.
		   hh	   The number of hours,	from 00	to 99.
		   mm	   The number of minutes, from 00 to 59.
		   SS	   The number of seconds, from 00 to 59.

	     The -A flag implies the -c	flag: if any file specified does not
	     exist, it will be silently	ignored.

     -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 it-
	     self 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
	     instead of	the current time of day.  The argument is of the form
	     "[[CC]YY]MMDDhhmm[.SS]" where each	pair of	letters	represents the

		   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"	be-
			   tween 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 01 to 12.
		   DD	   the day of the month, from 01 to 31.
		   hh	   The hour of the day,	from 00	to 23.
		   mm	   The minute of the hour, from	00 to 59.
		   SS	   The second of the minute, from 00 to	61.

	     If	the "CC" and "YY" letter pairs are not specified, the values
	     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 obsolescent form of touch, where a time format	is specified as	the
     first argument, is	supported.  When no -r or -t option is specified,
     there are at least	two arguments, and the first argument is a string of
     digits either eight or ten	characters in length, the first	argument is
     interpreted as a time specification of the	form "MMDDhhmm[YY]".

     The "MM", "DD", "hh" and "mm" letter pairs	are treated as their counter-
     parts 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.


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

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

BSD				April 28, 1995				   BSD


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