env.c revision 1.1 
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, 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
35char copyright[] =
36"@(#) Copyright (c) 1988 The Regents of the University of California.\n\
37 All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41static char sccsid[] = "@(#)env.c	5.3 (Berkeley) 6/1/90";
42#endif /* not lint */
43
44#include <stdio.h>
45#include <string.h>
46
47main(argc, argv)
48	int argc;
49	char **argv;
50{
51	extern char **environ;
52	extern int errno, optind;
53	register char **ep, *p;
54	char *cleanenv[1];
55	int ch;
56
57	while ((ch = getopt(argc, argv, "-")) != EOF)
58		switch((char)ch) {
59		case '-':
60			environ = cleanenv;
61			cleanenv[0] = NULL;
62			break;
63		case '?':
64		default:
65			(void)fprintf(stderr,
66			    "usage: env [-] [name=value ...] [command]\n");
67			exit(1);
68		}
69	for (argv += optind; *argv && (p = index(*argv, '=')); ++argv)
70		(void)setenv(*argv, ++p, 1);
71	if (*argv) {
72		execvp(*argv, argv);
73		(void)fprintf(stderr, "env: %s: %s\n", *argv,
74		    strerror(errno));
75		exit(1);
76	}
77	for (ep = environ; *ep; ep++)
78		(void)printf("%s\n", *ep);
79	exit(0);
80}
81