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35 .\" @(#)touch.1 8.3 (Berkeley) 4/28/95

36 .\" $FreeBSD: src/usr.bin/touch/touch.1,v 1.16 2007/04/10 07:24:47 grog Exp $

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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

52 The

53 .Nm

54 utility sets the modification and access times of files.

55 If any file does not exist, it is created with default permissions.

56 .Pp

57 By default,

58 .Nm

59 changes both modification and access times. The

60 .Fl a

61 and

62 .Fl m

63 flags may be used to select the access time or the modification time

64 individually.

65 Selecting both is equivalent to the default.

66 By default, the timestamps are set to the current time.

67 The

68 .Fl t

69 flag explicitly specifies a different time, and the

70 .Fl r

71 flag specifies to set the times those of the specified file.

72 The

73 .Fl A

74 flag adjusts the values by a specified amount.

75 .Pp

76 The following options are available:

77 .Bl -tag -width Ds

78 .It Fl A

79 Adjust the access and modification time stamps for the file by the

80 specified value.

81 This flag is intended for use in modifying files with incorrectly set

82 time stamps.

83 .Pp

84 The argument is of the form

85 .Dq [-][[hh]mm]SS

86 where each pair of letters represents the following:

87 .Pp

88 .Bl -tag -width Ds -compact -offset indent

89 .It Ar -

90 Make the adjustment negative: the new time stamp is set to be before

91 the old one.

92 .It Ar hh

93 The number of hours, from 00 to 99.

94 .It Ar mm

95 The number of minutes, from 00 to 59.

96 .It Ar SS

97 The number of seconds, from 00 to 59.

98 .El

99 .Pp

100 The

101 .Fl A

102 flag implies the

103 .Fl c

104 flag: if any file specified does not exist, it will be silently ignored.

105 .It Fl a

106 Change the access time of the file.

107 The modification time of the file is not changed unless the

108 .Fl m

109 flag is also specified.

110 .It Fl c

111 Do not create the file if it does not exist.

112 The

113 .Nm

114 utility does not treat this as an error.

115 No error messages are displayed and the exit value is not affected.

116 .It Fl f

117 Attempt to force the update, even if the file permissions do not

118 currently permit it.

119 .It Fl h

120 If the file is a symbolic link, change the times of the link

121 itself rather than the file that the link points to.

122 Note that

123 .Fl h

124 implies

125 .Fl c

126 and thus will not create any new files.

127 .It Fl m

128 Change the modification time of the file.

129 The access time of the file is not changed unless the

130 .Fl a

131 flag is also specified.

132 .It Fl r

133 Use the access and modifications times from the specified file

134 instead of the current time of day.

135 .It Fl t

136 Change the access and modification times to the specified time instead

137 of the current time of day.

138 The argument is of the form

139 .Dq [[CC]YY]MMDDhhmm[.SS]

140 where each pair of letters represents the following:

141 .Pp

142 .Bl -tag -width Ds -compact -offset indent

143 .It Ar CC

144 The first two digits of the year (the century).

145 .It Ar YY

146 The second two digits of the year.

147 If

148 .Dq YY

149 is specified, but

150 .Dq CC

151 is not, a value for

152 .Dq YY

153 between 69 and 99 results in a

154 .Dq CC

155 value of 19.

156 Otherwise, a

157 .Dq CC

158 value of 20 is used.

159 .It Ar MM

160 The month of the year, from 01 to 12.

161 .It Ar DD

162 the day of the month, from 01 to 31.

163 .It Ar hh

164 The hour of the day, from 00 to 23.

165 .It Ar mm

166 The minute of the hour, from 00 to 59.

167 .It Ar SS

168 The second of the minute, from 00 to 61.

169 .El

170 .Pp

171 If the

172 .Dq CC

173 and

174 .Dq YY

175 letter pairs are not specified, the values default to the current

176 year.

177 If the

178 .Dq SS

179 letter pair is not specified, the value defaults to 0.

180 .El

181 .Sh EXIT STATUS

182 .Ex -std

183 .Sh COMPATIBILITY

184 The obsolescent form of

185 .Nm ,

186 where a time format is specified as the first argument, is supported.

187 When no

188 .Fl r

189 or

190 .Fl t

191 option is specified, there are at least two arguments, and the first

192 argument is a string of digits either eight or ten characters in length,

193 the first argument is interpreted as a time specification of the form

194 .Dq MMDDhhmm[YY] .

195 .Pp

196 The

197 .Dq MM ,

198 .Dq DD ,

199 .Dq hh

200 and

201 .Dq mm

202 letter pairs are treated as their counterparts specified to the

203 .Fl t

204 option.

205 If the

206 .Dq YY

207 letter pair is in the range 39 to 99, the year is set to 1939 to 1999,

208 otherwise, the year is set in the 21st century.

209 .Sh SEE ALSO

210 .Xr utimes 2

211 .Sh STANDARDS

212 The

213 .Nm

214 utility is expected to be a superset of the

215 .St -p1003.2

216 specification.

217 .Sh HISTORY

218 A

219 .Nm

220 utility appeared in

221 .At v7 .