touch: Change file timestamps
touch changes the access and/or modification times of the
specified files. Synopsis:
touch [option]... file...
If the first file would be a valid argument to the `-t' option and no timestamp is given with any of the `-d', `-r', or `-t' options and the `--' argument is not given, that argument is interpreted as the time for the other files instead of as a file name.
Any file that does not exist is created empty.
If changing both the access and modification times to the current
touch can change the timestamps for files that the user
running it does not own but has write permission for. Otherwise, the
user must own the files.
The program accepts the following options. Also see section Common options.
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