1 /* 2 * Copyright (c) 1987 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 MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 */ 17 18 #ifndef lint 19 char copyright[] = 20 "@(#) Copyright (c) 1987 Regents of the University of California.\n\ 21 All rights reserved.\n"; 22 #endif /* not lint */ 23 24 #ifndef lint 25 static char sccsid[] = "@(#)printenv.c 5.3 (Berkeley) 06/29/88"; 26 #endif /* not lint */ 27 28 /* 29 * printenv 30 * 31 * Bill Joy, UCB 32 * February, 1979 33 */ 34 main(argc, argv) 35 int argc; 36 char **argv; 37 { 38 extern char **environ; 39 register char *cp, **ep; 40 register int len; 41 42 if (argc < 2) { 43 for (ep = environ; *ep; ep++) 44 puts(*ep); 45 exit(0); 46 } 47 len = strlen(*++argv); 48 for (ep = environ; *ep; ep++) 49 if (!strncmp(*ep, *argv, len)) { 50 cp = *ep + len; 51 if (!*cp || *cp == '=') { 52 puts(*cp ? cp + 1 : cp); 53 exit(0); 54 } 55 } 56 exit(1); 57 } 58