/usr.bin/touch/touch.1

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  31. .\" @(#)touch.1 8.3 (Berkeley) 4/28/95
  32. .\" $FreeBSD$
  33. .\"
  34. .Dd June 10, 2012
  35. .Dt TOUCH 1
  36. .Os
  37. .Sh NAME
  38. .Nm touch
  39. .Nd change file access and modification times
  40. .Sh SYNOPSIS
  41. .Nm
  42. .Op Fl A Ar [-][[hh]mm]SS
  43. .Op Fl achm
  44. .Op Fl r Ar file
  45. .Op Fl t Ar [[CC]YY]MMDDhhmm[.SS]
  46. .Op Fl d Ar YYYY-MM-DDThh:mm:SS[.frac][tz]
  47. .Ar
  48. .Sh DESCRIPTION
  49. The
  50. .Nm
  51. utility sets the modification and access times of files.
  52. If any file does not exist, it is created with default permissions.
  53. .Pp
  54. By default,
  55. .Nm
  56. changes both modification and access times. The
  57. .Fl a
  58. and
  59. .Fl m
  60. flags may be used to select the access time or the modification time
  61. individually.
  62. Selecting both is equivalent to the default.
  63. By default, the timestamps are set to the current time.
  64. The
  65. .Fl d
  66. and
  67. .Fl t
  68. flags explicitly specify a different time, and the
  69. .Fl r
  70. flag specifies to set the times those of the specified file.
  71. The
  72. .Fl A
  73. flag adjusts the values by a specified amount.
  74. .Pp
  75. The following options are available:
  76. .Bl -tag -width Ds
  77. .It Fl A
  78. Adjust the access and modification time stamps for the file by the
  79. specified value.
  80. This flag is intended for use in modifying files with incorrectly set
  81. time stamps.
  82. .Pp
  83. The argument is of the form
  84. .Dq [-][[hh]mm]SS
  85. where each pair of letters represents the following:
  86. .Pp
  87. .Bl -tag -width Ds -compact -offset indent
  88. .It Ar -
  89. Make the adjustment negative: the new time stamp is set to be before
  90. the old one.
  91. .It Ar hh
  92. The number of hours, from 00 to 99.
  93. .It Ar mm
  94. The number of minutes, from 00 to 59.
  95. .It Ar SS
  96. The number of seconds, from 00 to 59.
  97. .El
  98. .Pp
  99. The
  100. .Fl A
  101. flag implies the
  102. .Fl c
  103. flag: if any file specified does not exist, it will be silently ignored.
  104. .It Fl a
  105. Change the access time of the file.
  106. The modification time of the file is not changed unless the
  107. .Fl m
  108. flag is also specified.
  109. .It Fl c
  110. Do not create the file if it does not exist.
  111. The
  112. .Nm
  113. utility does not treat this as an error.
  114. No error messages are displayed and the exit value is not affected.
  115. .It Fl d
  116. Change the access and modification times to the specified time instead
  117. of the current time of day.
  118. The argument is of the form
  119. .Dq YYYY-MM-DDThh:mm:SS[.frac][tz]
  120. where the letters represent the following:
  121. .Bl -tag -width Ds -compact -offset indent
  122. .It Ar YYYY
  123. The year.
  124. .It Ar MM
  125. The month of the year, from 01 to 12.
  126. .It Ar DD
  127. The day of the month, from 01 to 31.
  128. .It Ar T
  129. The letter
  130. .Li T
  131. or a space.
  132. .It Ar hh
  133. The hour of the day, from 00 to 23.
  134. .It Ar mm
  135. The minute of the hour, from 00 to 59.
  136. .It Ar SS
  137. The second of the minute, from 00 to 61.
  138. .It Ar .frac
  139. An optional fraction,
  140. consisting of a period or a comma followed by one or more digits.
  141. The number of significant digits depends on the kernel configuration and
  142. the filesystem, and may be zero.
  143. .It Ar tz
  144. An optional letter
  145. .Li Z
  146. indicating the time is in
  147. .Tn UTC .
  148. Otherwise, the time is assumed to be in local time.
  149. .El
  150. .It Fl h
  151. If the file is a symbolic link, change the times of the link
  152. itself rather than the file that the link points to.
  153. Note that
  154. .Fl h
  155. implies
  156. .Fl c
  157. and thus will not create any new files.
  158. .It Fl m
  159. Change the modification time of the file.
  160. The access time of the file is not changed unless the
  161. .Fl a
  162. flag is also specified.
  163. .It Fl r
  164. Use the access and modifications times from the specified file
  165. instead of the current time of day.
  166. .It Fl t
  167. Change the access and modification times to the specified time instead
  168. of the current time of day.
  169. The argument is of the form
  170. .Dq [[CC]YY]MMDDhhmm[.SS]
  171. where each pair of letters represents the following:
  172. .Pp
  173. .Bl -tag -width Ds -compact -offset indent
  174. .It Ar CC
  175. The first two digits of the year (the century).
  176. .It Ar YY
  177. The second two digits of the year.
  178. If
  179. .Dq YY
  180. is specified, but
  181. .Dq CC
  182. is not, a value for
  183. .Dq YY
  184. between 69 and 99 results in a
  185. .Dq CC
  186. value of 19.
  187. Otherwise, a
  188. .Dq CC
  189. value of 20 is used.
  190. .It Ar MM
  191. The month of the year, from 01 to 12.
  192. .It Ar DD
  193. the day of the month, from 01 to 31.
  194. .It Ar hh
  195. The hour of the day, from 00 to 23.
  196. .It Ar mm
  197. The minute of the hour, from 00 to 59.
  198. .It Ar SS
  199. The second of the minute, from 00 to 61.
  200. .El
  201. .Pp
  202. If the
  203. .Dq CC
  204. and
  205. .Dq YY
  206. letter pairs are not specified, the values default to the current
  207. year.
  208. If the
  209. .Dq SS
  210. letter pair is not specified, the value defaults to 0.
  211. .El
  212. .Sh EXIT STATUS
  213. .Ex -std
  214. .Sh COMPATIBILITY
  215. The obsolescent form of
  216. .Nm ,
  217. where a time format is specified as the first argument, is supported.
  218. When no
  219. .Fl r
  220. or
  221. .Fl t
  222. option is specified, there are at least two arguments, and the first
  223. argument is a string of digits either eight or ten characters in length,
  224. the first argument is interpreted as a time specification of the form
  225. .Dq MMDDhhmm[YY] .
  226. .Pp
  227. The
  228. .Dq MM ,
  229. .Dq DD ,
  230. .Dq hh
  231. and
  232. .Dq mm
  233. letter pairs are treated as their counterparts specified to the
  234. .Fl t
  235. option.
  236. If the
  237. .Dq YY
  238. letter pair is in the range 39 to 99, the year is set to 1939 to 1999,
  239. otherwise, the year is set in the 21st century.
  240. .Sh SEE ALSO
  241. .Xr utimes 2
  242. .Sh STANDARDS
  243. The
  244. .Nm
  245. utility is expected to be a superset of the
  246. .St -p1003.2
  247. specification.
  248. .Sh HISTORY
  249. A
  250. .Nm
  251. utility appeared in
  252. .At v7 .