1 /* 2 * Copyright (c) 1988, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#) Copyright (c) 1988, 1993, 1994 The Regents of the University of California. All rights reserved. 34 * @(#)env.c 8.3 (Berkeley) 4/2/94 35 * $FreeBSD: src/usr.bin/env/env.c,v 1.5.2.3 2002/06/26 08:23:36 tjr Exp $ 36 * $DragonFly: src/usr.bin/env/env.c,v 1.3 2003/10/04 20:36:43 hmp Exp $ 37 */ 38 39 #include <err.h> 40 #include <errno.h> 41 #include <stdio.h> 42 #include <string.h> 43 #include <stdlib.h> 44 #include <unistd.h> 45 46 extern char **environ; 47 48 static void usage(void); 49 50 int 51 main(int argc, char **argv) 52 { 53 char **ep, *p; 54 char *cleanenv[1]; 55 int ch; 56 57 while ((ch = getopt(argc, argv, "-i")) != -1) 58 switch(ch) { 59 case '-': 60 case 'i': 61 environ = cleanenv; 62 cleanenv[0] = NULL; 63 break; 64 case '?': 65 default: 66 usage(); 67 } 68 for (argv += optind; *argv && (p = strchr(*argv, '=')); ++argv) 69 (void)setenv(*argv, ++p, 1); 70 if (*argv) { 71 execvp(*argv, argv); 72 err(errno == ENOENT ? 127 : 126, "%s", *argv); 73 } 74 for (ep = environ; *ep; ep++) 75 (void)printf("%s\n", *ep); 76 exit(0); 77 } 78 79 static void 80 usage(void) 81 { 82 (void)fprintf(stderr, 83 "usage: env [-] [-i] [name=value ...] [utility [argument ...]]\n"); 84 exit(1); 85 } 86