Base: Write man page for touch(1)

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+## Name
+
+touch - create a file or change its timestamps
+
+## Synopsis
+
+```**sh
+$ touch [-acm] [-r ref_file|-t time|-d date_time] <path...>
+```
+
+## Description
+
+`touch` updates the last access and last modification times of all files
+specified in `path` to the current time.
+
+Unless `-c` is specified, `touch` creates a regular empty file for a `path`
+that does not exist.
+
+## Options
+
+* `-a`: Change access time of file
+* `-c`: Do not create a file if it does not exist
+* `-m`: Change modification time of file
+* `-r`: Use time of file specified by reference path instead of current time
+* `-t`: Use specified time in format [[CC]YY]MMDDhhmm[.SS] instead of current
+time
+* `-d`: Use specified datetime in formats YYYY-MM-DDThh:mm:SS[.frac][tz] or
+YYYY-MM-DDThh:mm:SS[,frac][tz] instead of current time
+
+## Examples
+
+```sh
+# Create or update a file named 'file' with its last access and last
+# modification attributes set to the current time:
+$ touch file
+
+# Update a file called 'somefile' with last access and last modification
+# timestamps set to 14:49:30 on May 13, 2009:
+$ touch -c -d '2009-05-13 14:49:30' somefile
+
+# Create or update a file called 'anotherfile', where the resulting file has
+# both last modification and last access timestamps set to April 4, 1971 at
+# 09:17:00 local time:
+$ touch -t 197104180917 anotherfile
+
+# Create or update a file called 'thatfile'. It's last access time is set to
+# the last access time of the file named 'anotherfile' instead of the current
+# time, and the last modification time remains unchanged as long as the file
+# exists:
+$ touch -r anotherfile thatfile
+```
+
+## See also
+
+* [`futimens`(2)](help://man/3/futimens)
+* [`utimensat`(2)](help://man/3/utimensat)