1 /* 2 * Copyright (c) 1988 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 MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 */ 17 18 #ifndef lint 19 char copyright[] = 20 "@(#) Copyright (c) 1988 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[] = "@(#)env.c 5.1 (Berkeley) 09/27/88"; 26 #endif /* not lint */ 27 28 #include <stdio.h> 29 #include <strings.h> 30 31 main(argc, argv) 32 int argc; 33 char **argv; 34 { 35 extern char **environ; 36 extern int errno, optind; 37 register char **ep, *p; 38 char *cleanenv[1]; 39 int ch; 40 41 while ((ch = getopt(argc, argv, "-")) != EOF) 42 switch((char)ch) { 43 case '-': 44 environ = cleanenv; 45 cleanenv[0] = NULL; 46 break; 47 case '?': 48 default: 49 (void)fprintf(stderr, 50 "usage: env [-] [name=value ...] [command]\n"); 51 exit(1); 52 } 53 for (argv += optind; *argv && (p = index(*argv, '=')); ++argv) 54 (void)setenv(*argv, ++p, 1); 55 if (*argv) { 56 execvp(*argv, argv); 57 (void)fprintf(stderr, "env: %s: %s\n", *argv, 58 strerror(errno)); 59 exit(1); 60 } 61 for (ep = environ; *ep; ep++) 62 (void)printf("%s\n", *ep); 63 exit(0); 64 } 65