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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]
50 utility sets the modification and access times of files.
51 If any file does not exist, it is created with default permissions.
55 changes both modification and access times. The
59 flags may be used to select the access time or the modification time
61 Selecting both is equivalent to the default.
62 By default, the timestamps are set to the current time.
65 flag explicitly specifies a different time, and the
67 flag specifies to set the times those of the specified file.
70 flag adjusts the values by a specified amount.
72 The following options are available:
75 Adjust the access and modification time stamps for the file by the
77 This flag is intended for use in modifying files with incorrectly set
80 The argument is of the form
82 where each pair of letters represents the following:
84 .Bl -tag -width Ds -compact -offset indent
86 Make the adjustment negative: the new time stamp is set to be before
89 The number of hours, from 00 to 99.
91 The number of minutes, from 00 to 59.
93 The number of seconds, from 00 to 59.
100 flag: if any file specified does not exist, it will be silently ignored.
102 Change the access time of the file.
103 The modification time of the file is not changed unless the
105 flag is also specified.
107 Do not create the file if it does not exist.
110 utility does not treat this as an error.
111 No error messages are displayed and the exit value is not affected.
113 Attempt to force the update, even if the file permissions do not
116 If the file is a symbolic link, change the times of the link
117 itself rather than the file that the link points to.
122 and thus will not create any new files.
124 Change the modification time of the file.
125 The access time of the file is not changed unless the
127 flag is also specified.
129 Use the access and modifications times from the specified file
130 instead of the current time of day.
132 Change the access and modification times to the specified time instead
133 of the current time of day.
134 The argument is of the form
135 .Dq [[CC]YY]MMDDhhmm[.SS]
136 where each pair of letters represents the following:
138 .Bl -tag -width Ds -compact -offset indent
140 The first two digits of the year (the century).
142 The second two digits of the year.
149 between 69 and 99 results in a
156 The month of the year, from 01 to 12.
158 the day of the month, from 01 to 31.
160 The hour of the day, from 00 to 23.
162 The minute of the hour, from 00 to 59.
164 The second of the minute, from 00 to 61.
171 letter pairs are not specified, the values default to the current
175 letter pair is not specified, the value defaults to 0.
180 The obsolescent form of
182 where a time format is specified as the first argument, is supported.
187 option is specified, there are at least two arguments, and the first
188 argument is a string of digits either eight or ten characters in length,
189 the first argument is interpreted as a time specification of the form
198 letter pairs are treated as their counterparts specified to the
203 letter pair is in the range 39 to 99, the year is set to 1939 to 1999,
204 otherwise, the year is set in the 21st century.
210 utility is expected to be a superset of the