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

/*
* Copyright (c) 1988, 1993
*      The Regents of the University of California.  All rights reserved.
*
* %sccs.include.redist.c%
*/

#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1988, 1993\n\
       The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)env.c       8.1 (Berkeley) %G%";
#endif /* not lint */

#include <stdio.h>
#include <string.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);
}