env.c revision 41568 
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#ifndef lint
41static const char sccsid[] = "@(#)env.c	8.3 (Berkeley) 4/2/94";
42#endif /* not lint */
43
44#include <err.h>
45#include <stdio.h>
46#include <string.h>
47#include <stdlib.h>
48#include <unistd.h>
49
50extern char **environ;
51
52static void usage __P((void));
53
54int
55main(argc, argv)
56	int argc;
57	char **argv;
58{
59	char **ep, *p;
60	char *cleanenv[1];
61	int ch;
62
63	while ((ch = getopt(argc, argv, "-")) != -1)
64		switch(ch) {
65		case '-':
66			environ = cleanenv;
67			cleanenv[0] = NULL;
68			break;
69		case '?':
70		default:
71			usage();
72		}
73	for (argv += optind; *argv && (p = strchr(*argv, '=')); ++argv)
74		(void)setenv(*argv, ++p, 1);
75	if (*argv) {
76		execvp(*argv, argv);
77		err(1, "%s", *argv);
78	}
79	for (ep = environ; *ep; ep++)
80		(void)printf("%s\n", *ep);
81	exit(0);
82}
83
84static void
85usage()
86{
87	(void)fprintf(stderr,
88	    "usage: env [-] [name=value ...] [command]\n");
89	exit(1);
90}
91