193 lines
5.2 KiB
Groff
193 lines
5.2 KiB
Groff
.\" $NetBSD: touch.1,v 1.25 2012/10/24 02:46:25 pgoyette Exp $
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.\"
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.\" Copyright (c) 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" the Institute of Electrical and Electronics Engineers, Inc.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)touch.1 8.3 (Berkeley) 4/28/95
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.\"
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.Dd October 22, 2012
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.Dt TOUCH 1
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.Os
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.Sh NAME
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.Nm touch
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.Nd change file access and modification times
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.Sh SYNOPSIS
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.Nm
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.Op Fl acfhm
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.Op Fl d Ar human-datetime
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.Op Fl Fl date Ar human-datetime
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.Op Fl r Ar file
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.Op Fl Fl reference Ar file
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.Op Fl t Ar datetime
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.Ar file ...
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.Sh DESCRIPTION
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The
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.Nm
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utility changes the access and modification times of files to the
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current time of day.
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If the file doesn't exist, it is created with default permissions.
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.Pp
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The following options are available:
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.Bl -tag -width "-d human-datetime"
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.It Fl a
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Change the access time of the file.
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The modification time of the file is not changed unless the
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.Fl m
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flag is also specified.
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.It Fl c
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Do not create the file if it does not exist.
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The
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.Nm
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utility does not treat this as an error.
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No error messages are displayed and the exit value is not affected.
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.It Fl d Ar human-datetime
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.It Fl Fl date Ar human-datetime
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Parse
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.Ar human-datetime
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using the human datetime parser
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.Xr parsedate 3 .
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.It Fl f
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This flag has no effect; it is accepted for compatibility reasons.
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.It Fl h
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If
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.Ar file
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is a symbolic link, access and/or modification time of the link is changed.
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This option implies
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.Fl c .
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.It Fl m
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Change the modification time of the file.
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The access time of the file is not changed unless the
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.Fl a
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flag is also specified.
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.It Fl r Ar file
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.It Fl Fl reference Ar file
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Use the access and modifications times from
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.Ar file
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instead of the current time of day.
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.It Fl t Ar datetime
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Change the access and modification times to the specified time.
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The argument
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.Ar datetime
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should be in the form
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.Dq [[CC]YY]MMDDhhmm[.SS]
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where each pair of letters represents the following:
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.Pp
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.Bl -tag -width Ds -compact -offset indent
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.It Ar CC
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The first two digits of the year (the century).
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.It Ar YY
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The second two digits of the year.
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If
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.Dq YY
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is specified, but
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.Dq CC
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is not, a value for
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.Dq YY
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between 69 and 99 results in a
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.Dq CC
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value of 19.
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Otherwise, a
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.Dq CC
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value of 20 is used.
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.It Ar MM
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The month of the year, from 1 to 12.
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.It Ar DD
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The day of the month, from 1 to 31.
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.It Ar hh
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The hour of the day, from 0 to 23.
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.It Ar mm
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The minute of the hour, from 0 to 59.
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.It Ar SS
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The second of the minute, from 0 to 61.
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.El
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.Pp
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If the
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.Dq CC
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and
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.Dq YY
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letter pairs are not specified, the values default to the current
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year.
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If the
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.Dq SS
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letter pair is not specified, the value defaults to 0.
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.El
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.Pp
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The
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.Fl d ,
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.Fl r ,
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and
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.Fl t
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options are mutually exclusive.
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If more than one of these options is present, the last one is used.
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.Sh EXIT STATUS
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.Ex -std
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.Sh COMPATIBILITY
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The obsolescent form of
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.Nm ,
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where a time format is specified as the first argument, is supported.
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When no
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.Fl d ,
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.Fl r ,
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or
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.Fl t
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option is specified, there are at least two arguments, and the first
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argument is a string of digits either eight or ten characters in length,
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the first argument is interpreted as a time specification of the form
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.Dq MMDDhhmm[YY] .
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.Pp
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The
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.Dq MM ,
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.Dq DD ,
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.Dq hh
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and
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.Dq mm
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letter pairs are treated as their counterparts specified to the
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.Fl t
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option.
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If the
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.Dq YY
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letter pair is in the range 69 to 99, the year is set to 1969 to 1999,
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otherwise, the year is set in the 21st century.
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.Sh SEE ALSO
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.Xr utimes 2
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.Sh STANDARDS
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The
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.Nm
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utility is expected to be a superset of the
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.St -p1003.2
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specification.
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.Sh HISTORY
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A
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.Nm
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utility appeared in
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.At v7 .
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.Sh BUGS
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A symbolic link can't be a reference file of access and/or modification time.
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