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 35 static 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 41 static 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 50 extern char **environ; 51 52 static void usage __P((void)); 53 54 int 55 main(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, "-i")) != -1) 64 switch(ch) { 65 case '-': 66 case 'i': 67 environ = cleanenv; 68 cleanenv[0] = NULL; 69 break; 70 case '?': 71 default: 72 usage(); 73 } 74 for (argv += optind; *argv && (p = strchr(*argv, '=')); ++argv) 75 (void)setenv(*argv, ++p, 1); 76 if (*argv) { 77 execvp(*argv, argv); 78 err(1, "%s", *argv); 79 } 80 for (ep = environ; *ep; ep++) 81 (void)printf("%s\n", *ep); 82 exit(0); 83 } 84 85 static void 86 usage() 87 { 88 (void)fprintf(stderr, 89 "usage: env [-] [-i] [name=value ...] [command]\n"); 90 exit(1); 91 } 92