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31 .\" @(#)touch.1 8.3 (Berkeley) 4/28/95
39 .Nd change file access and modification times
42 .Op Fl A Ar [-][[hh]mm]SS
45 .Op Fl t Ar [[CC]YY]MMDDhhmm[.SS]
46 .Op Fl d Ar YYYY-MM-DDThh:mm:SS[.frac][tz]
51 utility sets the modification and access times of files.
52 If any file does not exist, it is created with default permissions.
56 changes both modification and access times.
61 flags may be used to select the access time or the modification time
63 Selecting both is equivalent to the default.
64 By default, the timestamps are set to the current time.
69 flags explicitly specify a different time, and the
71 flag specifies to set the times those of the specified file.
74 flag adjusts the values by a specified amount.
76 The following options are available:
79 Adjust the access and modification time stamps for the file by the
81 This flag is intended for use in modifying files with incorrectly set
84 The argument is of the form
86 where each pair of letters represents the following:
88 .Bl -tag -width Ds -compact -offset indent
90 Make the adjustment negative: the new time stamp is set to be before
93 The number of hours, from 00 to 99.
95 The number of minutes, from 00 to 59.
97 The number of seconds, from 00 to 59.
104 flag: if any file specified does not exist, it will be silently ignored.
106 Change the access time of the file.
107 The modification time of the file is not changed unless the
109 flag is also specified.
111 Do not create the file if it does not exist.
114 utility does not treat this as an error.
115 No error messages are displayed and the exit value is not affected.
117 Change the access and modification times to the specified date time instead
118 of the current time of day.
119 The argument is of the form
120 .Dq YYYY-MM-DDThh:mm:SS[.frac][tz]
121 where the letters represent the following:
122 .Bl -tag -width Ds -compact -offset indent
124 At least four decimal digits representing the year.
125 .It Ar MM , Ar DD , Ar hh , Ar mm , Ar SS
132 or a space is the time designator.
134 An optional fraction, consisting of a period or a comma followed by one or
136 The number of significant digits depends on the kernel configuration and the
137 filesystem, and may be zero.
141 indicating the time is in
143 Otherwise, the time is assumed to be in local time.
144 Local time is affected by the value of the
146 environment variable.
149 If the file is a symbolic link, change the times of the link
150 itself rather than the file that the link points to.
155 and thus will not create any new files.
157 Change the modification time of the file.
158 The access time of the file is not changed unless the
160 flag is also specified.
162 Use the access and modifications times from the specified file
163 instead of the current time of day.
165 Change the access and modification times to the specified time instead
166 of the current time of day.
167 The argument is of the form
168 .Dq [[CC]YY]MMDDhhmm[.SS]
169 where each pair of letters represents the following:
171 .Bl -tag -width Ds -compact -offset indent
173 The first two digits of the year (the century).
175 The second two digits of the year.
182 between 69 and 99 results in a
189 The month of the year, from 01 to 12.
191 the day of the month, from 01 to 31.
193 The hour of the day, from 00 to 23.
195 The minute of the hour, from 00 to 59.
197 The second of the minute, from 00 to 60.
204 letter pairs are not specified, the values default to the current
208 letter pair is not specified, the value defaults to 0.
213 The obsolescent form of
215 where a time format is specified as the first argument, is supported.
220 option is specified, there are at least two arguments, and the first
221 argument is a string of digits either eight or ten characters in length,
222 the first argument is interpreted as a time specification of the form
231 letter pairs are treated as their counterparts specified to the
236 letter pair is in the range 39 to 99, the year is set to 1939 to 1999,
237 otherwise, the year is set in the 21st century.
243 utility is expected to be a superset of the