1 /* 2 * Copyright (c) 1987, 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 char copyright[] = 36 "@(#) Copyright (c) 1987, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 static char sccsid[] = "@(#)man.c 8.13 (Berkeley) 12/20/93"; 42 #endif /* not lint */ 43 44 #include <sys/param.h> 45 #include <sys/queue.h> 46 47 #include <ctype.h> 48 #include <err.h> 49 #include <errno.h> 50 #include <fcntl.h> 51 #include <fnmatch.h> 52 #include <glob.h> 53 #include <signal.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <string.h> 57 #include <unistd.h> 58 59 #include "config.h" 60 #include "pathnames.h" 61 62 int f_all, f_where; 63 64 static void build_page __P((char *, char **)); 65 static void cat __P((char *)); 66 static char *check_pager __P((char *)); 67 static int cleanup __P((void)); 68 static void how __P((char *)); 69 static void jump __P((char **, char *, char *)); 70 static int manual __P((char *, TAG *, glob_t *)); 71 static void onsig __P((int)); 72 static void usage __P((void)); 73 74 int 75 main(argc, argv) 76 int argc; 77 char *argv[]; 78 { 79 extern char *optarg; 80 extern int optind; 81 TAG *defp, *defnewp, *section, *sectnewp, *subp; 82 ENTRY *e_defp, *e_sectp, *e_subp, *ep; 83 glob_t pg; 84 size_t len; 85 int ch, f_cat, f_how, found; 86 char **ap, *cmd, *machine, *p, *p_add, *p_path, *pager, *slashp; 87 char *conffile, buf[MAXPATHLEN * 2]; 88 89 f_cat = f_how = 0; 90 conffile = p_add = p_path = NULL; 91 while ((ch = getopt(argc, argv, "-aC:cfhkM:m:P:w")) != EOF) 92 switch (ch) { 93 case 'a': 94 f_all = 1; 95 break; 96 case 'C': 97 conffile = optarg; 98 break; 99 case 'c': 100 case '-': /* Deprecated. */ 101 f_cat = 1; 102 break; 103 case 'h': 104 f_how = 1; 105 break; 106 case 'm': 107 p_add = optarg; 108 break; 109 case 'M': 110 case 'P': /* Backward compatibility. */ 111 p_path = optarg; 112 break; 113 /* 114 * The -f and -k options are backward compatible, 115 * undocumented ways of calling whatis(1) and apropos(1). 116 */ 117 case 'f': 118 jump(argv, "-f", "whatis"); 119 /* NOTREACHED */ 120 case 'k': 121 jump(argv, "-k", "apropos"); 122 /* NOTREACHED */ 123 case 'w': 124 f_all = f_where = 1; 125 break; 126 case '?': 127 default: 128 usage(); 129 } 130 argc -= optind; 131 argv += optind; 132 133 if (!*argv) 134 usage(); 135 136 if (!f_cat && !f_how && !f_where) 137 if (!isatty(1)) 138 f_cat = 1; 139 else if ((pager = getenv("PAGER")) != NULL) 140 pager = check_pager(pager); 141 else 142 pager = _PATH_PAGER; 143 144 /* Read the configuration file. */ 145 config(conffile); 146 147 /* Get the machine type. */ 148 if ((machine = getenv("MACHINE")) == NULL) 149 machine = MACHINE; 150 151 /* If there's no _default list, create an empty one. */ 152 if ((defp = getlist("_default")) == NULL) 153 defp = addlist("_default"); 154 155 /* 156 * 1: If the user specified a MANPATH variable, or set the -M 157 * option, we replace the _default list with the user's list, 158 * appending the entries in the _subdir list and the machine. 159 */ 160 if (p_path == NULL) 161 p_path = getenv("MANPATH"); 162 if (p_path != NULL) { 163 while ((e_defp = defp->list.tqh_first) != NULL) { 164 free(e_defp->s); 165 TAILQ_REMOVE(&defp->list, e_defp, q); 166 } 167 for (p = strtok(p_path, ":"); 168 p != NULL; p = strtok(NULL, ":")) { 169 slashp = p[strlen(p) - 1] == '/' ? "" : "/"; 170 e_subp = (subp = getlist("_subdir")) == NULL ? 171 NULL : subp->list.tqh_first; 172 for (; e_subp != NULL; e_subp = e_subp->q.tqe_next) { 173 (void)snprintf(buf, sizeof(buf), "%s%s%s{/%s,}", 174 p, slashp, e_subp->s, machine); 175 if ((ep = malloc(sizeof(ENTRY))) == NULL || 176 (ep->s = strdup(buf)) == NULL) 177 err(1, NULL); 178 TAILQ_INSERT_TAIL(&defp->list, ep, q); 179 } 180 } 181 } 182 183 /* 184 * 2: If the user did not specify MANPATH, -M or a section, rewrite 185 * the _default list to include the _subdir list and the machine. 186 */ 187 if (argv[1] == NULL) 188 section = NULL; 189 else if ((section = getlist(*argv)) != NULL) 190 ++argv; 191 if (p_path == NULL && section == NULL) { 192 defnewp = addlist("_default_new"); 193 e_defp = 194 defp->list.tqh_first == NULL ? NULL : defp->list.tqh_first; 195 for (; e_defp != NULL; e_defp = e_defp->q.tqe_next) { 196 slashp = 197 e_defp->s[strlen(e_defp->s) - 1] == '/' ? "" : "/"; 198 e_subp = (subp = getlist("_subdir")) == NULL ? 199 NULL : subp->list.tqh_first; 200 for (; e_subp != NULL; e_subp = e_subp->q.tqe_next) { 201 (void)snprintf(buf, sizeof(buf), "%s%s%s{/%s,}", 202 e_defp->s, slashp, e_subp->s, machine); 203 if ((ep = malloc(sizeof(ENTRY))) == NULL || 204 (ep->s = strdup(buf)) == NULL) 205 err(1, NULL); 206 TAILQ_INSERT_TAIL(&defnewp->list, ep, q); 207 } 208 } 209 defp = getlist("_default"); 210 while ((e_defp = defp->list.tqh_first) != NULL) { 211 free(e_defp->s); 212 TAILQ_REMOVE(&defp->list, e_defp, q); 213 } 214 free(defp->s); 215 TAILQ_REMOVE(&head, defp, q); 216 defnewp = getlist("_default_new"); 217 free(defnewp->s); 218 defnewp->s = "_default"; 219 defp = defnewp; 220 } 221 222 /* 223 * 3: If the user set the -m option, insert the user's list before 224 * whatever list we have, again appending the _subdir list and 225 * the machine. 226 */ 227 if (p_add != NULL) 228 for (p = strtok(p_add, ":"); p != NULL; p = strtok(NULL, ":")) { 229 slashp = p[strlen(p) - 1] == '/' ? "" : "/"; 230 e_subp = (subp = getlist("_subdir")) == NULL ? 231 NULL : subp->list.tqh_first; 232 for (; e_subp != NULL; e_subp = e_subp->q.tqe_next) { 233 (void)snprintf(buf, sizeof(buf), "%s%s%s{/%s,}", 234 p, slashp, e_subp->s, machine); 235 if ((ep = malloc(sizeof(ENTRY))) == NULL || 236 (ep->s = strdup(buf)) == NULL) 237 err(1, NULL); 238 TAILQ_INSERT_HEAD(&defp->list, ep, q); 239 } 240 } 241 242 /* 243 * 4: If none of MANPATH, -M, or -m were specified, and a section was, 244 * rewrite the section's paths (if they have a trailing slash) to 245 * append the _subdir list and the machine. This then becomes the 246 * _default list. 247 */ 248 if (p_path == NULL && p_add == NULL && section != NULL) { 249 sectnewp = addlist("_section_new"); 250 for (e_sectp = section->list.tqh_first; 251 e_sectp != NULL; e_sectp = e_sectp->q.tqe_next) { 252 if (e_sectp->s[strlen(e_sectp->s) - 1] != '/') { 253 (void)snprintf(buf, sizeof(buf), 254 "%s{/%s,}", e_sectp->s, machine); 255 if ((ep = malloc(sizeof(ENTRY))) == NULL || 256 (ep->s = strdup(buf)) == NULL) 257 err(1, NULL); 258 TAILQ_INSERT_TAIL(§newp->list, ep, q); 259 continue; 260 } 261 e_subp = (subp = getlist("_subdir")) == NULL ? 262 NULL : subp->list.tqh_first; 263 for (; e_subp != NULL; e_subp = e_subp->q.tqe_next) { 264 (void)snprintf(buf, sizeof(buf), "%s%s{/%s,}", 265 e_sectp->s, e_subp->s, machine); 266 if ((ep = malloc(sizeof(ENTRY))) == NULL || 267 (ep->s = strdup(buf)) == NULL) 268 err(1, NULL); 269 TAILQ_INSERT_TAIL(§newp->list, ep, q); 270 } 271 } 272 sectnewp->s = section->s; 273 defp = sectnewp; 274 TAILQ_REMOVE(&head, section, q); 275 } 276 277 /* 278 * 5: Search for the files. Set up an interrupt handler, so the 279 * temporary files go away. 280 */ 281 (void)signal(SIGINT, onsig); 282 (void)signal(SIGHUP, onsig); 283 284 memset(&pg, 0, sizeof(pg)); 285 for (found = 0; *argv; ++argv) 286 if (manual(*argv, defp, &pg)) 287 found = 1; 288 289 /* 6: If nothing found, we're done. */ 290 if (!found) { 291 (void)cleanup(); 292 exit (1); 293 } 294 295 /* 7: If it's simple, display it fast. */ 296 if (f_cat) { 297 for (ap = pg.gl_pathv; *ap != NULL; ++ap) { 298 if (**ap == '\0') 299 continue; 300 cat(*ap); 301 } 302 exit (cleanup()); 303 } 304 if (f_how) { 305 for (ap = pg.gl_pathv; *ap != NULL; ++ap) { 306 if (**ap == '\0') 307 continue; 308 how(*ap); 309 } 310 exit(cleanup()); 311 } 312 if (f_where) { 313 for (ap = pg.gl_pathv; *ap != NULL; ++ap) { 314 if (**ap == '\0') 315 continue; 316 (void)printf("%s\n", *ap); 317 } 318 exit(cleanup()); 319 } 320 321 /* 322 * 8: We display things in a single command; build a list of things 323 * to display. 324 */ 325 for (ap = pg.gl_pathv, len = strlen(pager) + 1; *ap != NULL; ++ap) { 326 if (**ap == '\0') 327 continue; 328 len += strlen(*ap) + 1; 329 } 330 if ((cmd = malloc(len)) == NULL) { 331 warn(NULL); 332 (void)cleanup(); 333 exit(1); 334 } 335 p = cmd; 336 len = strlen(pager); 337 memmove(p, pager, len); 338 p += len; 339 *p++ = ' '; 340 for (ap = pg.gl_pathv; *ap != NULL; ++ap) { 341 if (**ap == '\0') 342 continue; 343 len = strlen(*ap); 344 memmove(p, *ap, len); 345 p += len; 346 *p++ = ' '; 347 } 348 *p = '\0'; 349 350 /* Use system(3) in case someone's pager is "pager arg1 arg2". */ 351 (void)system(cmd); 352 353 exit(cleanup()); 354 } 355 356 /* 357 * manual -- 358 * Search the manuals for the pages. 359 */ 360 static int 361 manual(page, tag, pg) 362 char *page; 363 TAG *tag; 364 glob_t *pg; 365 { 366 ENTRY *ep, *e_sufp, *e_tag; 367 TAG *missp, *sufp; 368 int anyfound, cnt, found; 369 char *p, buf[128]; 370 371 anyfound = 0; 372 buf[0] = '*'; 373 374 /* For each element in the list... */ 375 e_tag = tag == NULL ? NULL : tag->list.tqh_first; 376 for (; e_tag != NULL; e_tag = e_tag->q.tqe_next) { 377 (void)snprintf(buf, sizeof(buf), "%s/%s.*", e_tag->s, page); 378 if (glob(buf, 379 GLOB_APPEND | GLOB_BRACE | GLOB_NOSORT | GLOB_QUOTE, 380 NULL, pg)) { 381 warn("globbing"); 382 (void)cleanup(); 383 exit(1); 384 } 385 if (pg->gl_matchc == 0) 386 continue; 387 388 /* Find out if it's really a man page. */ 389 for (cnt = pg->gl_pathc - pg->gl_matchc; 390 cnt < pg->gl_pathc; ++cnt) { 391 392 /* 393 * Try the _suffix key words first. 394 * 395 * XXX 396 * Older versions of man.conf didn't have the suffix 397 * key words, it was assumed that everything was a .0. 398 * We just test for .0 first, it's fast and probably 399 * going to hit. 400 */ 401 (void)snprintf(buf, sizeof(buf), "*/%s.0", page); 402 if (!fnmatch(buf, pg->gl_pathv[cnt], 0)) 403 goto next; 404 405 e_sufp = (sufp = getlist("_suffix")) == NULL ? 406 NULL : sufp->list.tqh_first; 407 for (found = 0; 408 e_sufp != NULL; e_sufp = e_sufp->q.tqe_next) { 409 (void)snprintf(buf, 410 sizeof(buf), "*/%s%s", page, e_sufp->s); 411 if (!fnmatch(buf, pg->gl_pathv[cnt], 0)) { 412 found = 1; 413 break; 414 } 415 } 416 if (found) 417 goto next; 418 419 /* Try the _build key words next. */ 420 e_sufp = (sufp = getlist("_build")) == NULL ? 421 NULL : sufp->list.tqh_first; 422 for (found = 0; 423 e_sufp != NULL; e_sufp = e_sufp->q.tqe_next) { 424 for (p = e_sufp->s; 425 *p != '\0' && !isspace(*p); ++p); 426 if (*p == '\0') 427 continue; 428 *p = '\0'; 429 (void)snprintf(buf, 430 sizeof(buf), "*/%s%s", page, e_sufp->s); 431 if (!fnmatch(buf, pg->gl_pathv[cnt], 0)) { 432 if (!f_where) 433 build_page(p + 1, 434 &pg->gl_pathv[cnt]); 435 *p = ' '; 436 found = 1; 437 break; 438 } 439 *p = ' '; 440 } 441 if (found) { 442 next: anyfound = 1; 443 if (!f_all) { 444 /* Delete any other matches. */ 445 while (++cnt< pg->gl_pathc) 446 pg->gl_pathv[cnt] = ""; 447 break; 448 } 449 continue; 450 } 451 452 /* It's not a man page, forget about it. */ 453 pg->gl_pathv[cnt] = ""; 454 } 455 456 if (anyfound && !f_all) 457 break; 458 } 459 460 /* If not found, enter onto the missing list. */ 461 if (!anyfound) { 462 if ((missp = getlist("_missing")) == NULL) 463 missp = addlist("_missing"); 464 if ((ep = malloc(sizeof(ENTRY))) == NULL || 465 (ep->s = strdup(page)) == NULL) { 466 warn(NULL); 467 (void)cleanup(); 468 exit(1); 469 } 470 TAILQ_INSERT_TAIL(&missp->list, ep, q); 471 } 472 return (anyfound); 473 } 474 475 /* 476 * build_page -- 477 * Build a man page for display. 478 */ 479 static void 480 build_page(fmt, pathp) 481 char *fmt, **pathp; 482 { 483 static int warned; 484 ENTRY *ep; 485 TAG *intmpp; 486 int fd, n; 487 char *p, *b; 488 char buf[MAXPATHLEN], cmd[MAXPATHLEN], tpath[sizeof(_PATH_TMP)]; 489 490 /* Let the user know this may take awhile. */ 491 if (!warned) { 492 warned = 1; 493 warnx("Formatting manual page..."); 494 } 495 496 /* 497 * Historically man chdir'd to the root of the man tree. 498 * This was used in man pages that contained relative ".so" 499 * directives (including other man pages for command aliases etc.) 500 * It even went one step farther, by examining the first line 501 * of the man page and parsing the .so filename so it would 502 * make hard(?) links to the cat'ted man pages for space savings. 503 * (We don't do that here, but we could). 504 */ 505 506 /* copy and find the end */ 507 for (b = buf, p = *pathp; (*b++ = *p++) != '\0';) 508 continue; 509 510 /* skip the last two path components, page name and man[n] */ 511 for (--b, n = 2; b != buf; b--) 512 if (*b == '/') 513 if (--n == 0) { 514 *b = '\0'; 515 (void) chdir(buf); 516 } 517 518 /* Add a remove-when-done list. */ 519 if ((intmpp = getlist("_intmp")) == NULL) 520 intmpp = addlist("_intmp"); 521 522 /* Move to the printf(3) format string. */ 523 for (; *fmt && isspace(*fmt); ++fmt) 524 continue; 525 526 /* 527 * Get a temporary file and build a version of the file 528 * to display. Replace the old file name with the new one. 529 */ 530 (void)strcpy(tpath, _PATH_TMP); 531 if ((fd = mkstemp(tpath)) == -1) { 532 warn("%s", tpath); 533 (void)cleanup(); 534 exit(1); 535 } 536 (void)snprintf(buf, sizeof(buf), "%s > %s", fmt, tpath); 537 (void)snprintf(cmd, sizeof(cmd), buf, *pathp); 538 (void)system(cmd); 539 (void)close(fd); 540 if ((*pathp = strdup(tpath)) == NULL) { 541 warn(NULL); 542 (void)cleanup(); 543 exit(1); 544 } 545 546 /* Link the built file into the remove-when-done list. */ 547 if ((ep = malloc(sizeof(ENTRY))) == NULL) { 548 warn(NULL); 549 (void)cleanup(); 550 exit(1); 551 } 552 ep->s = *pathp; 553 TAILQ_INSERT_TAIL(&intmpp->list, ep, q); 554 } 555 556 /* 557 * how -- 558 * display how information 559 */ 560 static void 561 how(fname) 562 char *fname; 563 { 564 FILE *fp; 565 566 int lcnt, print; 567 char *p, buf[256]; 568 569 if (!(fp = fopen(fname, "r"))) { 570 warn("%s", fname); 571 (void)cleanup(); 572 exit (1); 573 } 574 #define S1 "SYNOPSIS" 575 #define S2 "S\bSY\bYN\bNO\bOP\bPS\bSI\bIS\bS" 576 #define D1 "DESCRIPTION" 577 #define D2 "D\bDE\bES\bSC\bCR\bRI\bIP\bPT\bTI\bIO\bON\bN" 578 for (lcnt = print = 0; fgets(buf, sizeof(buf), fp);) { 579 if (!strncmp(buf, S1, sizeof(S1) - 1) || 580 !strncmp(buf, S2, sizeof(S2) - 1)) { 581 print = 1; 582 continue; 583 } else if (!strncmp(buf, D1, sizeof(D1) - 1) || 584 !strncmp(buf, D2, sizeof(D2) - 1)) 585 return; 586 if (!print) 587 continue; 588 if (*buf == '\n') 589 ++lcnt; 590 else { 591 for(; lcnt; --lcnt) 592 (void)putchar('\n'); 593 for (p = buf; isspace(*p); ++p); 594 (void)fputs(p, stdout); 595 } 596 } 597 (void)fclose(fp); 598 } 599 600 /* 601 * cat -- 602 * cat out the file 603 */ 604 static void 605 cat(fname) 606 char *fname; 607 { 608 int fd, n; 609 char buf[2048]; 610 611 if ((fd = open(fname, O_RDONLY, 0)) < 0) { 612 warn("%s", fname); 613 (void)cleanup(); 614 exit(1); 615 } 616 while ((n = read(fd, buf, sizeof(buf))) > 0) 617 if (write(STDOUT_FILENO, buf, n) != n) { 618 warn("write"); 619 (void)cleanup(); 620 exit (1); 621 } 622 if (n == -1) { 623 warn("read"); 624 (void)cleanup(); 625 exit(1); 626 } 627 (void)close(fd); 628 } 629 630 /* 631 * check_pager -- 632 * check the user supplied page information 633 */ 634 static char * 635 check_pager(name) 636 char *name; 637 { 638 char *p, *save; 639 640 /* 641 * if the user uses "more", we make it "more -s"; watch out for 642 * PAGER = "mypager /usr/ucb/more" 643 */ 644 for (p = name; *p && !isspace(*p); ++p); 645 for (; p > name && *p != '/'; --p); 646 if (p != name) 647 ++p; 648 649 /* make sure it's "more", not "morex" */ 650 if (!strncmp(p, "more", 4) && (!p[4] || isspace(p[4]))){ 651 save = name; 652 /* allocate space to add the "-s" */ 653 if (!(name = 654 malloc((u_int)(strlen(save) + sizeof("-s") + 1)))) 655 err(1, NULL); 656 (void)sprintf(name, "%s %s", save, "-s"); 657 } 658 return(name); 659 } 660 661 /* 662 * jump -- 663 * strip out flag argument and jump 664 */ 665 static void 666 jump(argv, flag, name) 667 char **argv, *flag, *name; 668 { 669 char **arg; 670 671 argv[0] = name; 672 for (arg = argv + 1; *arg; ++arg) 673 if (!strcmp(*arg, flag)) 674 break; 675 for (; *arg; ++arg) 676 arg[0] = arg[1]; 677 execvp(name, argv); 678 (void)fprintf(stderr, "%s: Command not found.\n", name); 679 exit(1); 680 } 681 682 /* 683 * onsig -- 684 * If signaled, delete the temporary files. 685 */ 686 static void 687 onsig(signo) 688 int signo; 689 { 690 (void)cleanup(); 691 692 (void)signal(signo, SIG_DFL); 693 (void)kill(getpid(), signo); 694 695 /* NOTREACHED */ 696 exit (1); 697 } 698 699 /* 700 * cleanup -- 701 * Clean up temporary files, show any error messages. 702 */ 703 static int 704 cleanup() 705 { 706 TAG *intmpp, *missp; 707 ENTRY *ep; 708 int rval; 709 710 rval = 0; 711 ep = (missp = getlist("_missing")) == NULL ? 712 NULL : missp->list.tqh_first; 713 if (ep != NULL) 714 for (; ep != NULL; ep = ep->q.tqe_next) { 715 warnx("no entry for %s in the manual.", ep->s); 716 rval = 1; 717 } 718 719 ep = (intmpp = getlist("_intmp")) == NULL ? 720 NULL : intmpp->list.tqh_first; 721 for (; ep != NULL; ep = ep->q.tqe_next) 722 (void)unlink(ep->s); 723 return (rval); 724 } 725 726 /* 727 * usage -- 728 * print usage message and die 729 */ 730 static void 731 usage() 732 { 733 (void)fprintf(stderr, 734 "usage: man [-ac] [-C file] [-M path] [-m path] [section] title ...\n"); 735 exit(1); 736 } 737