1 /* 2 * Copyright (c) 1988, 1993 Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 char copyright[] = 10 "@(#) Copyright (c) 1988, 1993 Regents of the University of California.\n\ 11 All rights reserved.\n"; 12 #endif /* not lint */ 13 14 #ifndef lint 15 static char sccsid[] = "@(#)hostname.c 5.5 (Berkeley) 04/29/93"; 16 #endif /* not lint */ 17 18 #include <sys/param.h> 19 20 #include <err.h> 21 #include <stdio.h> 22 #include <stdlib.h> 23 #include <string.h> 24 #include <unistd.h> 25 26 int 27 main(argc,argv) 28 int argc; 29 char *argv[]; 30 { 31 extern int optind; 32 int ch, sflag; 33 char *p, hostname[MAXHOSTNAMELEN]; 34 35 sflag = 0; 36 while ((ch = getopt(argc, argv, "s")) != EOF) 37 switch (ch) { 38 case 's': 39 sflag = 1; 40 break; 41 case '?': 42 default: 43 (void)fprintf(stderr, 44 "usage: hostname [-s] [hostname]\n"); 45 exit(1); 46 } 47 argc -= optind; 48 argv += optind; 49 50 if (*argv) { 51 if (sethostname(*argv, strlen(*argv))) 52 err(1, "sethostname"); 53 } else { 54 if (gethostname(hostname, sizeof(hostname))) 55 err(1, "gethostname"); 56 if (sflag && (p = strchr(hostname, '.'))) 57 *p = '\0'; 58 (void)printf("%s\n", hostname); 59 } 60 exit(0); 61 } 62