xref: /netbsd/usr.bin/touch/touch.1 (revision bf9ec67e)
1.\"	$NetBSD: touch.1,v 1.14 2002/02/08 01:36:35 ross Exp $
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6.\" This code is derived from software contributed to Berkeley by
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37.\"     @(#)touch.1	8.3 (Berkeley) 4/28/95
38.\"
39.Dd April 28, 1995
40.Dt TOUCH 1
41.Os
42.Sh NAME
43.Nm touch
44.Nd change file access and modification times
45.Sh SYNOPSIS
46.Nm
47.Op Fl acfhm
48.Op Fl r Ar file
49.Op Fl t Ar [[CC]YY]MMDDhhmm[.SS]
50.Ar file ...
51.Sh DESCRIPTION
52The
53.Nm
54utility sets the modification and access times of files to the
55current time of day.
56If the file doesn't exist, it is created with default permissions.
57.Pp
58The following options are available:
59.Bl -tag -width Ds
60.It Fl a
61Change the access time of the file.
62The modification time of the file is not changed unless the
63.Fl m
64flag is also specified.
65.It Fl c
66Do not create the file if it does not exist.
67The
68.Nm
69utility does not treat this as an error.
70No error messages are displayed and the exit value is not affected.
71.It Fl f
72Attempt to force the update, even if the file permissions do not
73currently permit it.
74.It Fl h
75If
76.Ar file
77is a symbolic link, access and/or modification time of the link is changed.
78This option implies
79.Fl c .
80.It Fl m
81Change the modification time of the file.
82The access time of the file is not changed unless the
83.Fl a
84flag is also specified.
85.It Fl r
86Use the access and modifications times from the specified file
87instead of the current time of day.
88.It Fl t
89Change the access and modification times to the specified time.
90The argument should be in the form
91.Dq [[CC]YY]MMDDhhmm[.SS]
92where each pair of letters represents the following:
93.Pp
94.Bl -tag -width Ds -compact -offset indent
95.It Ar CC
96The first two digits of the year (the century).
97.It Ar YY
98The second two digits of the year.
99If
100.Dq YY
101is specified, but
102.Dq CC
103is not, a value for
104.Dq YY
105between 69 and 99 results in a
106.Dq CC
107value of 19.
108Otherwise, a
109.Dq CC
110value of 20 is used.
111.It Ar MM
112The month of the year, from 1 to 12.
113.It Ar DD
114The day of the month, from 1 to 31.
115.It Ar hh
116The hour of the day, from 0 to 23.
117.It Ar mm
118The minute of the hour, from 0 to 59.
119.It Ar SS
120The second of the minute, from 0 to 61.
121.El
122.Pp
123If the
124.Dq CC
125and
126.Dq YY
127letter pairs are not specified, the values default to the current
128year.
129If the
130.Dq SS
131letter pair is not specified, the value defaults to 0.
132.El
133.Pp
134The
135.Nm
136utility exits 0 on success, and \*[Gt]0 if an error occurs.
137.Sh SEE ALSO
138.Xr utimes 2
139.Sh COMPATIBILITY
140The obsolescent form of
141.Nm "" ,
142where a time format is specified as the first argument, is supported.
143When no
144.Fl r
145or
146.Fl t
147option is specified, there are at least two arguments, and the first
148argument is a string of digits either eight or ten characters in length,
149the first argument is interpreted as a time specification of the form
150.Dq MMDDhhmm[YY] .
151.Pp
152The
153.Dq MM ,
154.Dq DD ,
155.Dq hh
156and
157.Dq mm
158letter pairs are treated as their counterparts specified to the
159.Fl t
160option.
161If the
162.Dq YY
163letter pair is in the range 69 to 99, the year is set to 1969 to 1999,
164otherwise, the year is set in the 21st century.
165.Sh STANDARDS
166The
167.Nm
168utility is expected to be a superset of the
169.St -p1003.2
170specification.
171.Sh HISTORY
172A
173.Nm
174utility appeared in
175.At v7 .
176.Sh BUGS
177A symbolic link can't be a reference file of access and/or modification time.
178