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 35 char 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 41 static char sccsid[] = "@(#)env.c 5.3 (Berkeley) 6/1/90"; 42 #endif /* not lint */ 43 44 #include <stdio.h> 45 #include <string.h> 46 47 main(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