- change file access and modification times
/usr/ucb/touch [-acfm] file...
touch sets the access and modification times of each file to the current time. file is created if it does not already exist.
Change the access time of file. Do not change the modification time unless -m is also specified.
Do not create file if it does not exist.
Attempt to force the touch in spite of read and write permissions on file.
Change the modification time of file. Do not change the access time unless -a is also specified.
See largefile(5) for the description of the behavior of touch when encountering files greater than or equal to 2 Gbyte ( 231 bytes).
The following exit values are returned:
touch executed successfully and all requested changes were made.
An error occurred. touch returns the number of files for which the times could not be successfully modified.
See attributes(5) for descriptions of the following attributes: