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.\" 4. Neither the name of the University nor the names of its contributors 16.\" may be used to endorse or promote products derived from this software 17.\" without specific prior written permission. 18.\" 19.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29.\" SUCH DAMAGE. 30.\" 31.\" @(#)touch.1 8.3 (Berkeley) 4/28/95 32.\" $FreeBSD$ 33.\" 34.Dd April 28, 1995 35.Dt TOUCH 1 36.Os 37.Sh NAME 38.Nm touch 39.Nd change file access and modification times 40.Sh SYNOPSIS 41.Nm 42.Op Fl A Ar [-][[hh]mm]SS 43.Op Fl acfhm 44.Op Fl r Ar file 45.Op Fl t Ar [[CC]YY]MMDDhhmm[.SS] 46.Ar 47.Sh DESCRIPTION 48The 49.Nm 50utility sets the modification and access times of files. 51If any file does not exist, it is created with default permissions. 52.Pp 53By default, 54.Nm 55changes both modification and access times. The 56.Fl a 57and 58.Fl m 59flags may be used to select the access time or the modification time 60individually. 61Selecting both is equivalent to the default. 62By default, the timestamps are set to the current time. 63The 64.Fl t 65flag explicitly specifies a different time, and the 66.Fl r 67flag specifies to set the times those of the specified file. 68The 69.Fl A 70flag adjusts the values by a specified amount. 71.Pp 72The following options are available: 73.Bl -tag -width Ds 74.It Fl A 75Adjust the access and modification time stamps for the file by the 76specified value. 77This flag is intended for use in modifying files with incorrectly set 78time stamps. 79.Pp 80The argument is of the form 81.Dq [-][[hh]mm]SS 82where each pair of letters represents the following: 83.Pp 84.Bl -tag -width Ds -compact -offset indent 85.It Ar - 86Make the adjustment negative: the new time stamp is set to be before 87the old one. 88.It Ar hh 89The number of hours, from 00 to 99. 90.It Ar mm 91The number of minutes, from 00 to 59. 92.It Ar SS 93The number of seconds, from 00 to 59. 94.El 95.Pp 96The 97.Fl A 98flag implies the 99.Fl c 100flag: if any file specified does not exist, it will be silently ignored. 101.It Fl a 102Change the access time of the file. 103The modification time of the file is not changed unless the 104.Fl m 105flag is also specified. 106.It Fl c 107Do not create the file if it does not exist. 108The 109.Nm 110utility does not treat this as an error. 111No error messages are displayed and the exit value is not affected. 112.It Fl f 113Attempt to force the update, even if the file permissions do not 114currently permit it. 115.It Fl h 116If the file is a symbolic link, change the times of the link 117itself rather than the file that the link points to. 118Note that 119.Fl h 120implies 121.Fl c 122and thus will not create any new files. 123.It Fl m 124Change the modification time of the file. 125The access time of the file is not changed unless the 126.Fl a 127flag is also specified. 128.It Fl r 129Use the access and modifications times from the specified file 130instead of the current time of day. 131.It Fl t 132Change the access and modification times to the specified time instead 133of the current time of day. 134The argument is of the form 135.Dq [[CC]YY]MMDDhhmm[.SS] 136where each pair of letters represents the following: 137.Pp 138.Bl -tag -width Ds -compact -offset indent 139.It Ar CC 140The first two digits of the year (the century). 141.It Ar YY 142The second two digits of the year. 143If 144.Dq YY 145is specified, but 146.Dq CC 147is not, a value for 148.Dq YY 149between 69 and 99 results in a 150.Dq CC 151value of 19. 152Otherwise, a 153.Dq CC 154value of 20 is used. 155.It Ar MM 156The month of the year, from 01 to 12. 157.It Ar DD 158the day of the month, from 01 to 31. 159.It Ar hh 160The hour of the day, from 00 to 23. 161.It Ar mm 162The minute of the hour, from 00 to 59. 163.It Ar SS 164The second of the minute, from 00 to 61. 165.El 166.Pp 167If the 168.Dq CC 169and 170.Dq YY 171letter pairs are not specified, the values default to the current 172year. 173If the 174.Dq SS 175letter pair is not specified, the value defaults to 0. 176.El 177.Sh EXIT STATUS 178.Ex -std 179.Sh COMPATIBILITY 180The obsolescent form of 181.Nm , 182where a time format is specified as the first argument, is supported. 183When no 184.Fl r 185or 186.Fl t 187option is specified, there are at least two arguments, and the first 188argument is a string of digits either eight or ten characters in length, 189the first argument is interpreted as a time specification of the form 190.Dq MMDDhhmm[YY] . 191.Pp 192The 193.Dq MM , 194.Dq DD , 195.Dq hh 196and 197.Dq mm 198letter pairs are treated as their counterparts specified to the 199.Fl t 200option. 201If the 202.Dq YY 203letter pair is in the range 39 to 99, the year is set to 1939 to 1999, 204otherwise, the year is set in the 21st century. 205.Sh SEE ALSO 206.Xr utimes 2 207.Sh STANDARDS 208The 209.Nm 210utility is expected to be a superset of the 211.St -p1003.2 212specification. 213.Sh HISTORY 214A 215.Nm 216utility appeared in 217.At v7 . 218