None of these work without the proper # of arguments so print usage

mv.c

@@ -25,6 +25,9 @@ main(int argc, char *argv[])
 		usage();
 	} ARGEND;
 
+	if (argc < 2)
+		usage();
+
 	if(argc > 3 && !(stat(argv[argc-1], &st) == 0 && S_ISDIR(st.st_mode)))
 		eprintf("%s: not a directory\n", argv[argc-1]);
 	enmasse(argc, &argv[0], mv);