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touch(1)							      touch(1)

       touch - update access, modification, and/or change times of file

       ref_file time] file_name...

       time_str file_name...

       updates	the  access, modification, and last-change times of each argu‐
       ment.  The file name is created if it does not exist.  If  no  time  is
       specified (see date(1)) the current time is used.

       The and options are mutually exclusive.

       The following options are available:

	      Change the access time of
			     file_name to time, or to the current time if time
			     is not specified.	Do not change the modification
			     time unless is also specified.

	      Change the modification time of
			     file_name to time, or to the current time if time
			     is not specified.	Do not change the access  time
			     unless is also specified.

	      Silently prevent
			     from  creating  the file if it did not previously
			     exist.  Do not write any diagnostic messages con‐
			     cerning this condition.

	      Use the corresponding time of
			     ref_file instead of the current time.

	      Use the specified
			     time  instead  of	the  current time.  The option
			     argument is a decimal number of the form:


			     where each two digits represents the following:

			     CC	    The first two digits of the year.

			     YY	    The second two digits of the year.

			     MM	    The month of the year (01-12).

			     DD	    The day of the month (01-31).

			     hh	    The hour of the day (00-23).

			     mm	    The minute of the hour (00-59).

			     SS	    The second of the minute (00-61).

			     If neither CC nor YY is given, the	 current  year
			     is	 assumed.   If YY is specified, but CC is not,
			     CC is derived as follows: (taken into account the
			     local time factor)

			     If YY is:	 CC becomes:
			       69-99	     19
			       00-68	     20

			     If	 the  resulting	 time value precedes the Epoch
			     (00:00:00 January 1, 1970 Greenwich  Mean	Time),
			     exits immediately with an error status.

			     The  range for SS is 00 through 61 rather than 00
			     through 59 to accommodate leap seconds.  If SS is
			     60	 or 61, and the resulting time, as affected by
			     the environment variable, does  not  refer	 to  a
			     leap  second,  the	 resulting  time is one second
			     after a time where SS is 59.  If SS is not	 given
			     a value, it is assumed to be 0.

       The  syntax  shown  by  the  second line is recognized when neither the
       option, the option, nor the option  delimiter  is  specified,  and  the
       first  operand  consists of all decimal digits.	This operand is inter‐
       preted as the time argument instead of as a  file  name.	  However,  in
       this case, time_str is assumed to be of the form:


       This  is	 for  backward	compatibility.	The form given above is recom‐
       mended for future portability.  The option delimiter can be used before
       the  first  file_name if there is a possibility that file_name consists
       of all digits, in order to ensure that the first syntax is used.

       succeeds when invoked by the of the file if any of  the	following  are

	      ·	 A time is specified.

	      ·	 Only the access time of the file is being updated.

	      ·	 Only the modification time of the file is being updated.

       In  addition,  succeeds when invoked by a user with write permission on
       the file if of the following are true:

	      ·	 No time is specified.

	      ·	 the access time and modification time of the file  are	 being

   Environment Variables
       If the time is specified via the
	      option,  is  used	 to  interpret the time for the specified time

       determines the language in which messages are displayed.

       If is not specified in the environment or is set to the	empty  string,
       the  value  of is used as a default for each unspecified or empty vari‐
       able.  If is not specified or is set to the empty string, a default  of
       "C" (see lang(5)) is used instead of

       If  any	internationalization  variable	contains  an  invalid setting,
       behaves as if all internationalization variables are set to  "C".   See

   International Code Set Support
       Single- and multibyte character code sets are supported.

       returns the following values:

	      All    file_name arguments were successfully changed.

	      Prints out a diagnostic message
		     if	 an  invalid time or a time earlier than the Epoch was
		     specified with the option, or if  the  and	 options  were
		     both  specified, or if one or more of the file_name argu‐
		     ments could not be accessed.

       The following command sets the modification and	access	times  of  the
       file  named "bastille" to midnight, July 14, 1989, creating the file if
       it does not already exist.

       The following command does the same thing using the backward-compatible

       The following command sets the time of the two files named "0714000089"
       and "bastille" to the current time, creating them if they do not exist:

       To create a zero-length file, use any of the following:

       An attempt to touch a file owned by the superuser on  a	remote	server
       can fail, even if the invoking user has write permission on the file.

       date(1), utime(2).


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