[apple/file_cmds.git] / touch / touch.1

.\" Copyright (c) 1991, 1993
.\"	The Regents of the University of California.  All rights reserved.
.\"
.\" This code is derived from software contributed to Berkeley by
.\" the Institute of Electrical and Electronics Engineers, Inc.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\" 3. All advertising materials mentioning features or use of this software
.\"    must display the following acknowledgement:
.\"	This product includes software developed by the University of
.\"	California, Berkeley and its contributors.
.\" 4. Neither the name of the University nor the names of its contributors
.\"    may be used to endorse or promote products derived from this software
.\"    without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\"     @(#)touch.1	8.3 (Berkeley) 4/28/95
.\" $FreeBSD: src/usr.bin/touch/touch.1,v 1.11 2001/09/24 17:42:37 obrien Exp $
.\"
.Dd April 28, 1995
.Dt TOUCH 1
.Os
.Sh NAME
.Nm touch
.Nd change file access and modification times
.Sh SYNOPSIS
.Nm
.Op Fl acfm
.Op Fl r Ar file
.Op Fl t Ar [[CC]YY]MMDDhhmm[.SS]
.Ar
.Sh DESCRIPTION
The
.Nm
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.
.Pp
The following options are available:
.Bl -tag -width Ds
.It Fl a
Change the access time of the file.
The modification time of the file is not changed unless the
.Fl m
flag is also specified.
.It Fl c
Do not create the file if it does not exist.
The
.Nm
utility does not treat this as an error.
No error messages are displayed and the exit value is not affected.
.It Fl f
Attempt to force the update, even if the file permissions do not
currently permit it.
.It Fl m
Change the modification time of the file.
The access time of the file is not changed unless the
.Fl a
flag is also specified.
.It Fl r
Use the access and modifications times from the specified file
instead of the current time of day.
.It Fl t
Change the access and modification times to the specified time.
The argument should be in the form
.Dq [[CC]YY]MMDDhhmm[.SS]
where each pair of letters represents the following:
.Pp
.Bl -tag -width Ds -compact -offset indent
.It Ar CC
The first two digits of the year (the century).
.It Ar YY
The second two digits of the year.
If
.Dq YY
is specified, but
.Dq CC
is not, a value for
.Dq YY
between 69 and 99 results in a
.Dq CC
value of 19.
Otherwise, a
.Dq CC
value of 20 is used.
.It Ar MM
The month of the year, from 1 to 12.
.It Ar DD
the day of the month, from 1 to 31.
.It Ar hh
The hour of the day, from 0 to 23.
.It Ar mm
The minute of the hour, from 0 to 59.
.It Ar SS
The second of the minute, from 0 to 61.
.El
.Pp
If the
.Dq CC
and
.Dq YY
letter pairs are not specified, the values default to the current
year.
If the
.Dq SS
letter pair is not specified, the value defaults to 0.
.El
.Sh DIAGNOSTICS
.Ex -std
.Sh SEE ALSO
.Xr utimes 2
.Sh COMPATIBILITY
The obsolescent form of
.Nm ,
where a time format is specified as the first argument, is supported.
When no
.Fl r
or
.Fl 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
.Dq MMDDhhmm[YY] .
.Pp
The
.Dq MM ,
.Dq DD ,
.Dq hh
and
.Dq mm
letter pairs are treated as their counterparts specified to the
.Fl t
option.
If the
.Dq 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.
.Sh HISTORY
A
.Nm
utility appeared in
.At v7 .
.Sh STANDARDS
The
.Nm
utility is expected to be a superset of the
.St -p1003.2
specification.
Commit	Line	Data
44a7a5ab A	1	.\" Copyright (c) 1991, 1993
	2	.\" The Regents of the University of California. All rights reserved.
	3	.\"
	4	.\" This code is derived from software contributed to Berkeley by
	5	.\" the Institute of Electrical and Electronics Engineers, Inc.
	6	.\"
	7	.\" Redistribution and use in source and binary forms, with or without
	8	.\" modification, are permitted provided that the following conditions
	9	.\" are met:
	10	.\" 1. Redistributions of source code must retain the above copyright
	11	.\" notice, this list of conditions and the following disclaimer.
	12	.\" 2. Redistributions in binary form must reproduce the above copyright
	13	.\" notice, this list of conditions and the following disclaimer in the
	14	.\" documentation and/or other materials provided with the distribution.
	15	.\" 3. All advertising materials mentioning features or use of this software
	16	.\" must display the following acknowledgement:
	17	.\" This product includes software developed by the University of
	18	.\" California, Berkeley and its contributors.
	19	.\" 4. Neither the name of the University nor the names of its contributors
	20	.\" may be used to endorse or promote products derived from this software
	21	.\" without specific prior written permission.
	22	.\"
	23	.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	24	.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	25	.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	26	.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	27	.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	28	.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	29	.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	30	.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	31	.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	32	.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	33	.\" SUCH DAMAGE.
	34	.\"
	35	.\" @(#)touch.1 8.3 (Berkeley) 4/28/95
6c780a1f	36	.\" $FreeBSD: src/usr.bin/touch/touch.1,v 1.11 2001/09/24 17:42:37 obrien Exp $
44a7a5ab A	37	.\"
	38	.Dd April 28, 1995
	39	.Dt TOUCH 1
	40	.Os
	41	.Sh NAME
	42	.Nm touch
	43	.Nd change file access and modification times
	44	.Sh SYNOPSIS
	45	.Nm
f383e97b	46	.Op Fl acfm
44a7a5ab A	47	.Op Fl r Ar file
44a7a5ab A	48	.Op Fl t Ar [[CC]YY]MMDDhhmm[.SS]
6c780a1f	49	.Ar
44a7a5ab A	50	.Sh DESCRIPTION
	51	The
	52	.Nm
	53	utility sets the modification and access times of files to the
	54	current time of day.
	55	If the file doesn't exist, it is created with default permissions.
	56	.Pp
	57	The following options are available:
	58	.Bl -tag -width Ds
	59	.It Fl a
	60	Change the access time of the file.
	61	The modification time of the file is not changed unless the
	62	.Fl m
	63	flag is also specified.
	64	.It Fl c
	65	Do not create the file if it does not exist.
	66	The
	67	.Nm
	68	utility does not treat this as an error.
	69	No error messages are displayed and the exit value is not affected.
	70	.It Fl f
	71	Attempt to force the update, even if the file permissions do not
	72	currently permit it.
44a7a5ab A	73	.It Fl m
	74	Change the modification time of the file.
	75	The access time of the file is not changed unless the
	76	.Fl a
	77	flag is also specified.
	78	.It Fl r
	79	Use the access and modifications times from the specified file
	80	instead of the current time of day.
	81	.It Fl t
	82	Change the access and modification times to the specified time.
	83	The argument should be in the form
	84	.Dq [[CC]YY]MMDDhhmm[.SS]
	85	where each pair of letters represents the following:
	86	.Pp
	87	.Bl -tag -width Ds -compact -offset indent
	88	.It Ar CC
	89	The first two digits of the year (the century).
	90	.It Ar YY
	91	The second two digits of the year.
	92	If
	93	.Dq YY
	94	is specified, but
	95	.Dq CC
	96	is not, a value for
	97	.Dq YY
	98	between 69 and 99 results in a
	99	.Dq CC
	100	value of 19.
	101	Otherwise, a
	102	.Dq CC
	103	value of 20 is used.
	104	.It Ar MM
	105	The month of the year, from 1 to 12.
	106	.It Ar DD
6c780a1f	107	the day of the month, from 1 to 31.
44a7a5ab A	108	.It Ar hh
	109	The hour of the day, from 0 to 23.
	110	.It Ar mm
	111	The minute of the hour, from 0 to 59.
	112	.It Ar SS
	113	The second of the minute, from 0 to 61.
	114	.El
	115	.Pp
	116	If the
	117	.Dq CC
	118	and
	119	.Dq YY
	120	letter pairs are not specified, the values default to the current
	121	year.
	122	If the
	123	.Dq SS
	124	letter pair is not specified, the value defaults to 0.
	125	.El
6c780a1f A	126	.Sh DIAGNOSTICS
6c780a1f A	127	.Ex -std
44a7a5ab A	128	.Sh SEE ALSO
	129	.Xr utimes 2
	130	.Sh COMPATIBILITY
	131	The obsolescent form of
6c780a1f	132	.Nm ,
44a7a5ab A	133	where a time format is specified as the first argument, is supported.
	134	When no
	135	.Fl r
	136	or
	137	.Fl t
	138	option is specified, there are at least two arguments, and the first
	139	argument is a string of digits either eight or ten characters in length,
	140	the first argument is interpreted as a time specification of the form
	141	.Dq MMDDhhmm[YY] .
	142	.Pp
	143	The
	144	.Dq MM ,
	145	.Dq DD ,
	146	.Dq hh
	147	and
	148	.Dq mm
	149	letter pairs are treated as their counterparts specified to the
	150	.Fl t
	151	option.
	152	If the
	153	.Dq YY
6c780a1f A	154	letter pair is in the range 39 to 99, the year is set to 1939 to 1999,
	155	otherwise, the year is set in the 21st century.
	156	.Sh HISTORY
	157	A
	158	.Nm
	159	utility appeared in
	160	.At v7 .
44a7a5ab A	161	.Sh STANDARDS
	162	The
	163	.Nm
	164	utility is expected to be a superset of the
	165	.St -p1003.2
	166	specification.