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 36.\" $FreeBSD$ 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 46.Op Fl A Ar [-][[hh]mm]SS 47.Op Fl acfhm 48.Op Fl r Ar file 49.Op Fl t Ar [[CC]YY]MMDDhhmm[.SS] 50.Ar 51.Sh DESCRIPTION 52The 53.Nm 54utility sets the modification and access times of files. 55If any file does not exist, it is created with default permissions. 56.Pp 57By default, 58.Nm 59changes both modification and access times. The 60.Fl a 61and 62.Fl m 63flags may be used to select the access time or the modification time 64individually. 65Selecting both is equivalent to the default. 66The base times for the modification are both set to the current time. 67The 68.Fl t 69flag explicitly specifies a single time for both values, and the 70.Fl r 71flag specifies to set the times from those of a different file. 72The 73.Fl A 74flag adjusts the values by a specified amount. 75This adjustment is done after first establishing the base times. 76.Pp 77The following options are available: 78.Bl -tag -width Ds 79.It Fl A 80Adjust the access and modification time stamps for the file by the 81specified value. 82This flag is intended for use in modifying files with a time stamp 83relative to an incorrect time zone. 84It always modifies both the access time and the modification time. 85.Pp 86The argument is of the form 87.Dq [-][[hh]mm]SS 88where each pair of letters represents the following: 89.Pp 90.Bl -tag -width Ds -compact -offset indent 91.It Ar - 92Make the adjustment negative: the new time stamp is set to be before 93the old one. 94.It Ar hh 95The hour of the day, from 00 to 23. 96.It Ar mm 97The minute of the hour, from 00 to 59. 98.It Ar SS 99The second of the minute, from 00 to 59. 100.El 101.Pp 102When used in conjunction with the 103.Fl a 104flag only, the modification time is adjusted by the time specified as 105argument to the 106.Fl A 107flag, while the access time is modified from the base time described 108above. 109Similarly, when used in conjunction with the 110.Fl m 111flag only, the access time is adjusted by the time specified as 112argument to the 113.Fl A 114flag, while the access time is modified from the base time described 115above. 116.Pp 117If the file does not exist, and creation is allowed, 118.Fl A 119does not change its time stamps. 120.It Fl a 121Change the access time of the file. 122The modification time of the file is not changed unless one of the 123.Fl A 124or 125.Fl m 126flags is also specified. 127.It Fl c 128Do not create the file if it does not exist. 129The 130.Nm 131utility does not treat this as an error. 132No error messages are displayed and the exit value is not affected. 133.It Fl f 134Attempt to force the update, even if the file permissions do not 135currently permit it. 136.It Fl h 137If the file is a symbolic link, change the times of the link 138itself rather than the file that the link points to. 139Note that 140.Fl h 141implies 142.Fl c 143and thus will not create any new files. 144.It Fl m 145Change the modification time of the file. 146The access time of the file is not changed unless one of the 147.Fl A 148or 149.Fl a 150flags is also specified. 151.It Fl r 152Use the access and modifications times from the specified file 153instead of the current time of day. 154.It Fl t 155Change the access and modification times to the specified time. 156The argument is of the form 157.Dq [[CC]YY]MMDDhhmm[.SS] 158where each pair of letters represents the following: 159.Pp 160.Bl -tag -width Ds -compact -offset indent 161.It Ar CC 162The first two digits of the year (the century). 163.It Ar YY 164The second two digits of the year. 165If 166.Dq YY 167is specified, but 168.Dq CC 169is not, a value for 170.Dq YY 171between 69 and 99 results in a 172.Dq CC 173value of 19. 174Otherwise, a 175.Dq CC 176value of 20 is used. 177.It Ar MM 178The month of the year, from 01 to 12. 179.It Ar DD 180the day of the month, from 01 to 31. 181.It Ar hh 182The hour of the day, from 00 to 23. 183.It Ar mm 184The minute of the hour, from 00 to 59. 185.It Ar SS 186The second of the minute, from 00 to 61. 187.El 188.Pp 189If the 190.Dq CC 191and 192.Dq YY 193letter pairs are not specified, the values default to the current 194year. 195If the 196.Dq SS 197letter pair is not specified, the value defaults to 0. 198.El 199.Sh EXIT STATUS 200.Ex -std 201.Sh COMPATIBILITY 202The obsolescent form of 203.Nm , 204where a time format is specified as the first argument, is supported. 205When no 206.Fl r 207or 208.Fl t 209option is specified, there are at least two arguments, and the first 210argument is a string of digits either eight or ten characters in length, 211the first argument is interpreted as a time specification of the form 212.Dq MMDDhhmm[YY] . 213.Pp 214The 215.Dq MM , 216.Dq DD , 217.Dq hh 218and 219.Dq mm 220letter pairs are treated as their counterparts specified to the 221.Fl t 222option. 223If the 224.Dq YY 225letter pair is in the range 39 to 99, the year is set to 1939 to 1999, 226otherwise, the year is set in the 21st century. 227.Sh SEE ALSO 228.Xr utimes 2 229.Sh STANDARDS 230The 231.Nm 232utility is expected to be a superset of the 233.St -p1003.2 234specification. 235.Sh HISTORY 236A 237.Nm 238utility appeared in 239.At v7 . 240