commands interactively when  run, you must cause it, when started running for such interactive use  in the most ordinary way, to print or display an announcement  including an appropriate copyright notice and a notice that there is  no warranty (or else, saying that you provide a warranty) and that  users may redistribute the program under these conditions, and  telling the user how to view a copy of this License. (Exception: if  the Program itself is interactive but does not normally print such an  announc