touch
Unix-like operating system command
In computing, touch is a command used to update the access date and/or modification date of a computer file or directory. It is included in Unix and Unix-like operating systems, TSC's FLEX, Digital Research/Novell DR DOS, the AROS shell, the... Wikipedia
Function: Update the last-modified date on the given FILEs
Initial release date: January 1979
Syntax: touch -c -d DATE FILE FILE...
Original author(s): AT&T Bell Laboratories