env.c revision 102944
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 34#ifndef lint 35static const char copyright[] = 36"@(#) Copyright (c) 1988, 1993, 1994\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38#endif /* not lint */ 39 40#if 0 41#ifndef lint 42static char sccsid[] = "@(#)env.c 8.3 (Berkeley) 4/2/94"; 43#endif /* not lint */ 44#endif 45 46#include <sys/cdefs.h> 47__FBSDID("$FreeBSD: head/usr.bin/env/env.c 102944 2002-09-04 23:29:10Z dwmalone $"); 48 49#include <err.h> 50#include <errno.h> 51#include <stdio.h> 52#include <string.h> 53#include <stdlib.h> 54#include <unistd.h> 55 56extern char **environ; 57 58static void usage(void); 59 60int 61main(int argc, char **argv) 62{ 63 char **ep, *p; 64 char *cleanenv[1]; 65 int ch; 66 67 while ((ch = getopt(argc, argv, "-i")) != -1) 68 switch(ch) { 69 case '-': 70 case 'i': 71 environ = cleanenv; 72 cleanenv[0] = NULL; 73 break; 74 case '?': 75 default: 76 usage(); 77 } 78 for (argv += optind; *argv && (p = strchr(*argv, '=')); ++argv) 79 (void)setenv(*argv, ++p, 1); 80 if (*argv) { 81 execvp(*argv, argv); 82 err(errno == ENOENT ? 127 : 126, "%s", *argv); 83 } 84 for (ep = environ; *ep; ep++) 85 (void)printf("%s\n", *ep); 86 exit(0); 87} 88 89static void 90usage(void) 91{ 92 (void)fprintf(stderr, 93 "usage: env [-i] [name=value ...] [utility [argument ...]]\n"); 94 exit(1); 95} 96