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35 .\" @(#)touch.1 8.3 (Berkeley) 4/28/95
42 .Nd change file access and modification times
47 .Op Fl t Ar [[CC]YY]MMDDhhmm[.SS]
52 utility sets the modification and access times of files to the
54 If the file doesn't exist, it is created with default permissions.
56 The following options are available:
59 Change the access time of the file.
60 The modification time of the file is not changed unless the
62 flag is also specified.
64 Do not create the file if it does not exist.
67 utility does not treat this as an error.
68 No error messages are displayed and the exit value is not affected.
70 Attempt to force the update, even if the file permissions do not
73 Change the modification time of the file.
74 The access time of the file is not changed unless the
76 flag is also specified.
78 Use the access and modifications times from the specified file
79 instead of the current time of day.
81 Change the access and modification times to the specified time.
82 The argument should be in the form
83 .Dq [[CC]YY]MMDDhhmm[.SS]
84 where each pair of letters represents the following:
86 .Bl -tag -width Ds -compact -offset indent
88 The first two digits of the year (the century).
90 The second two digits of the year.
97 between 69 and 99 results in a
104 The month of the year, from 1 to 12.
106 the day of the month, from 1 to 31.
108 The hour of the day, from 0 to 23.
110 The minute of the hour, from 0 to 59.
112 The second of the minute, from 0 to 61.
119 letter pairs are not specified, the values default to the current
123 letter pair is not specified, the value defaults to 0.
128 utility exits 0 on success, and >0 if an error occurs.
132 The obsolescent form of
134 where a time format is specified as the first argument, is supported.
139 option is specified, there are at least two arguments, and the first
140 argument is a string of digits either eight or ten characters in length,
141 the first argument is interpreted as a time specification of the form
150 letter pairs are treated as their counterparts specified to the
155 letter pair is in the range 39 to 99, the year is set to 1939 to 1999,
156 otherwise, the year is set in the 21st century.
165 utility is expected to be a superset of the