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 #include <errno.h> 47 48 static void usage(); 49 50 main(argc, argv) 51 int argc; 52 char **argv; 53 { 54 extern char **environ; 55 extern int errno, optind; 56 register char **ep, *p; 57 char *cleanenv[1]; 58 int ch; 59 60 while ((ch = getopt(argc, argv, "-i")) != EOF) 61 switch((char)ch) { 62 case '-': /* obsolete */ 63 case 'i': 64 environ = cleanenv; 65 cleanenv[0] = NULL; 66 break; 67 case '?': 68 default: 69 usage(); 70 } 71 72 for (argv += optind; *argv && (p = index(*argv, '=')); ++argv) 73 (void)setenv(*argv, ++p, 1); 74 75 if (*argv) { 76 /* return 127 if the command to be run could not be found; 126 77 if the command was was found but could not be invoked */ 78 int status; 79 80 execvp(*argv, argv); 81 status = (errno == ENOENT) ? 127 : 126; 82 (void)fprintf(stderr, "env: %s: %s\n", *argv, strerror(errno)); 83 exit(status); 84 } 85 86 for (ep = environ; *ep; ep++) 87 (void)printf("%s\n", *ep); 88 89 exit(0); 90 } 91 92 static void 93 usage () 94 { 95 (void) fprintf(stderr, "usage: env [-i] [name=value ...] [command]\n"); 96 exit (1); 97 } 98