touch - set modification date of a file
       touch [ -c ] [ -t time ] file ...
       Touch  attempts  to  set the modification time of the files to time (by
       default, the current time).  If a file  does  not  exist,  it  will  be
       created unless option -c is present.
       /src/cmd/touch.c
       ls(1), stat(3), chmod(1)
       Touch will not touch directories.
                                                                      TOUCH(1)