56 void usage(void);
59 usage(void)  in usage()  function
111 			usage();  in initattr()
118 		usage();  in initattr()
164 		usage();  in showattr()
203 		usage();  in main()
207 			usage();  in main()
216 			usage();  in main()
225 			usage();  in main()
239 			usage();  in main()
264 		usage();  in main()