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[unix-history] / usr / src / usr.bin / env / env.c

/*
 * Copyright (c) 1988 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1988 The Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)env.c	5.1 (Berkeley) %G%";
#endif /* not lint */

#include <stdio.h>
#include <strings.h>

main(argc, argv)
	int argc;
	char **argv;
{
	extern char **environ;
	extern int errno, optind;
	register char **ep, *p;
	char *cleanenv[1];
	int ch;

	while ((ch = getopt(argc, argv, "-")) != EOF)
		switch((char)ch) {
		case '-':
			environ = cleanenv;
			cleanenv[0] = NULL;
			break;
		case '?':
		default:
			(void)fprintf(stderr,
			    "usage: env [-] [name=value ...] [command]\n");
			exit(1);
		}
	for (argv += optind; *argv && (p = index(*argv, '=')); ++argv)
		(void)setenv(*argv, ++p, 1);
	if (*argv) {
		execvp(*argv, argv);
		(void)fprintf(stderr, "env: %s: %s\n", *argv,
		    strerror(errno));
		exit(1);
	}
	for (ep = environ; *ep; ep++)
		(void)printf("%s\n", *ep);
	exit(0);
}