How can I call system commands in fortran

From: Thomas Rudel (thomas.rudel_at_univie.ac.at)
Date: 03/18/05 

Date: Fri, 18 Mar 2005 19:38:32 +0100

I need a program routine in Fortran to:

1.) read in the contents (files) of a directory
2.) create a new directory
3.) copy files from one into another new directory

or, how can I call system commands in Fortran.

Many thanks

 tr