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 February 4, 2012 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 achm 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 h 113If the file is a symbolic link, change the times of the link 114itself rather than the file that the link points to. 115Note that 116.Fl h 117implies 118.Fl c 119and thus will not create any new files. 120.It Fl m 121Change the modification time of the file. 122The access time of the file is not changed unless the 123.Fl a 124flag is also specified. 125.It Fl r 126Use the access and modifications times from the specified file 127instead of the current time of day. 128.It Fl t 129Change the access and modification times to the specified time instead 130of the current time of day. 131The argument is of the form 132.Dq [[CC]YY]MMDDhhmm[.SS] 133where each pair of letters represents the following: 134.Pp 135.Bl -tag -width Ds -compact -offset indent 136.It Ar CC 137The first two digits of the year (the century). 138.It Ar YY 139The second two digits of the year. 140If 141.Dq YY 142is specified, but 143.Dq CC 144is not, a value for 145.Dq YY 146between 69 and 99 results in a 147.Dq CC 148value of 19. 149Otherwise, a 150.Dq CC 151value of 20 is used. 152.It Ar MM 153The month of the year, from 01 to 12. 154.It Ar DD 155the day of the month, from 01 to 31. 156.It Ar hh 157The hour of the day, from 00 to 23. 158.It Ar mm 159The minute of the hour, from 00 to 59. 160.It Ar SS 161The second of the minute, from 00 to 61. 162.El 163.Pp 164If the 165.Dq CC 166and 167.Dq YY 168letter pairs are not specified, the values default to the current 169year. 170If the 171.Dq SS 172letter pair is not specified, the value defaults to 0. 173.El 174.Sh EXIT STATUS 175.Ex -std 176.Sh COMPATIBILITY 177The obsolescent form of 178.Nm , 179where a time format is specified as the first argument, is supported. 180When no 181.Fl r 182or 183.Fl t 184option is specified, there are at least two arguments, and the first 185argument is a string of digits either eight or ten characters in length, 186the first argument is interpreted as a time specification of the form 187.Dq MMDDhhmm[YY] . 188.Pp 189The 190.Dq MM , 191.Dq DD , 192.Dq hh 193and 194.Dq mm 195letter pairs are treated as their counterparts specified to the 196.Fl t 197option. 198If the 199.Dq YY 200letter pair is in the range 39 to 99, the year is set to 1939 to 1999, 201otherwise, the year is set in the 21st century. 202.Sh SEE ALSO 203.Xr utimes 2 204.Sh STANDARDS 205The 206.Nm 207utility is expected to be a superset of the 208.St -p1003.2 209specification. 210.Sh HISTORY 211A 212.Nm 213utility appeared in 214.At v7 . 215