1 This file is help.def, from which is created help.c.
2 It implements the builtin "help" in Bash.
4 Copyright (C) 1987-2002 Free Software Foundation, Inc.
6 This file is part of GNU Bash, the Bourne Again SHell.
8 Bash is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 2, or (at your option) any later
13 Bash is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License along
19 with Bash; see the file COPYING. If not, write to the Free Software
20 Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA.
25 $FUNCTION help_builtin
26 $DEPENDS_ON HELP_BUILTIN
27 $SHORT_DOC help [-s] [pattern ...]
28 Display helpful information about builtin commands. If PATTERN is
29 specified, gives detailed help on all commands matching PATTERN,
30 otherwise a list of the builtins is printed. The -s option
31 restricts the output for each builtin command matching PATTERN to
32 a short usage synopsis.
37 #if defined (HELP_BUILTIN)
40 #if defined (HAVE_UNISTD_H)
42 # include <sys/types.h>
52 #include "../builtins.h"
53 #include "../pathexp.h"
55 #include "bashgetopt.h"
57 #include <glob/strmatch.h>
58 #include <glob/glob.h>
64 static void show_builtin_command_help __P((void));
65 static void show_longdoc __P((int));
67 /* Print out a list of the known functions in the shell, and what they do.
68 If LIST is supplied, print out the list which matches for each pattern
76 int plen, match_found, sflag;
79 reset_internal_getopt ();
80 while ((i = internal_getopt (list, "s")) != -1)
96 show_shell_version (0);
97 show_builtin_command_help ();
98 return (EXECUTION_SUCCESS);
101 /* We should consider making `help bash' do something. */
103 if (glob_pattern_p (list->word->word))
105 printf ("Shell commands matching keyword%s `", list->next ? "s" : "");
106 print_word_list (list, ", ");
110 for (match_found = 0, pattern = ""; list; list = list->next)
112 pattern = list->word->word;
113 plen = strlen (pattern);
115 for (i = 0; name = shell_builtins[i].name; i++)
118 if ((strncmp (pattern, name, plen) == 0) ||
119 (strmatch (pattern, name, FNMATCH_EXTFLAG) != FNM_NOMATCH))
121 printf ("%s: %s\n", name, shell_builtins[i].short_doc);
131 if (match_found == 0)
133 builtin_error ("no help topics match `%s'. Try `help help' or `man -k %s' or `info %s'.", pattern, pattern, pattern);
134 return (EXECUTION_FAILURE);
138 return (EXECUTION_SUCCESS);
141 /* By convention, enforced by mkbuiltins.c, if separate help files are being
142 used, the long_doc array contains one string -- the full pathname of the
143 help file for this builtin. */
152 doc = shell_builtins[i].long_doc;
154 if (doc && doc[0] && *doc[0] == '/' && doc[1] == (char *)NULL)
156 fd = open (doc[0], O_RDONLY);
159 builtin_error ("%s: cannot open: %s", doc[0], strerror (errno));
162 zcatfd (fd, 1, doc[0]);
166 for (j = 0; doc[j]; j++)
167 printf (" %s\n", doc[j]);
171 show_builtin_command_help ()
177 "These shell commands are defined internally. Type `help' to see this list.\n\
178 Type `help name' to find out more about the function `name'.\n\
179 Use `info bash' to find out more about the shell in general.\n\
180 Use `man -k' or `info' to find out more about commands not in this list.\n\
182 A star (*) next to a name means that the command is disabled.\n\
185 for (i = 0; i < num_shell_builtins; i++)
188 blurb[0] = (shell_builtins[i].flags & BUILTIN_ENABLED) ? ' ' : '*';
189 strncpy (blurb + 1, shell_builtins[i].short_doc, 34);
191 printf ("%s", blurb);
196 for (j = strlen (blurb); j < 35; j++)
202 #endif /* HELP_BUILTIN */