1 /* 2 * Copyright (c) 1989 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms are permitted 6 * provided that the above copyright notice and this paragraph are 7 * duplicated in all such forms and that any documentation, 8 * advertising materials, and other materials related to such 9 * distribution and use acknowledge that the software was developed 10 * by the University of California, Berkeley. The name of the 11 * University may not be used to endorse or promote products derived 12 * from this software without specific prior written permission. 13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 */ 17 18 #ifndef lint 19 char copyright[] = 20 "@(#) Copyright (c) 1989 The Regents of the University of California.\n\ 21 All rights reserved.\n"; 22 #endif /* not lint */ 23 24 #ifndef lint 25 static char sccsid[] = "@(#)echo.c 5.1 (Berkeley) 05/28/89"; 26 #endif /* not lint */ 27 28 #include <stdio.h> 29 30 main(argc, argv) 31 int argc; 32 char **argv; 33 { 34 extern int optind; 35 int ch, nflag; 36 37 nflag = 0; 38 while ((ch = getopt(argc, argv, "n")) != EOF) 39 switch(ch) { 40 case 'n': 41 nflag = 1; 42 break; 43 case '?': 44 default: 45 (void)fprintf(stderr, "usage: echo [-n] [arg ...]\n"); 46 exit(1); 47 } 48 argv += optind; 49 50 while (*argv) { 51 (void)printf("%s", *argv); 52 if (*++argv) 53 putchar(' '); 54 } 55 if (!nflag) 56 putchar('\n'); 57 exit(0); 58 } 59