env.c revision 92920 
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 92920 2002-03-22 01:22:50Z imp $");
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(argc, argv)
62	int argc;
63	char **argv;
64{
65	char **ep, *p;
66	char *cleanenv[1];
67	int ch;
68
69	while ((ch = getopt(argc, argv, "-i")) != -1)
70		switch(ch) {
71		case '-':
72		case 'i':
73			environ = cleanenv;
74			cleanenv[0] = NULL;
75			break;
76		case '?':
77		default:
78			usage();
79		}
80	for (argv += optind; *argv && (p = strchr(*argv, '=')); ++argv)
81		(void)setenv(*argv, ++p, 1);
82	if (*argv) {
83		execvp(*argv, argv);
84		err(errno == ENOENT ? 127 : 126, "%s", *argv);
85	}
86	for (ep = environ; *ep; ep++)
87		(void)printf("%s\n", *ep);
88	exit(0);
89}
90
91static void
92usage()
93{
94	(void)fprintf(stderr,
95	    "usage: env [-] [-i] [name=value ...] [command]\n");
96	exit(1);
97}
98