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284 lines
11 KiB
HTML
284 lines
11 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2019 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Free Software" and "Free Software Needs
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Free Documentation", with the Front-Cover Texts being "A GNU Manual,"
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and with the Back-Cover Texts as in (a) below.
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(a) The FSF's Back-Cover Text is: "You are free to copy and modify
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this GNU Manual. Buying copies from GNU Press supports the FSF in
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developing GNU and promoting software freedom." -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Help (Debugging with GDB)</title>
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<meta name="description" content="Help (Debugging with GDB)">
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<meta name="keywords" content="Help (Debugging with GDB)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Commands.html#Commands" rel="up" title="Commands">
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<link href="Running.html#Running" rel="next" title="Running">
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<link href="Completion.html#Completion" rel="prev" title="Completion">
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<style type="text/css">
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a.summary-letter {text-decoration: none}
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blockquote.indentedblock {margin-right: 0em}
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blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
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blockquote.smallquotation {font-size: smaller}
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div.display {margin-left: 3.2em}
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div.example {margin-left: 3.2em}
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div.smalllisp {margin-left: 3.2em}
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kbd {font-style: oblique}
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pre.display {font-family: inherit}
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pre.format {font-family: inherit}
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pre.menu-comment {font-family: serif}
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pre.smalldisplay {font-family: inherit; font-size: smaller}
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pre.smallexample {font-size: smaller}
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pre.smallformat {font-family: inherit; font-size: smaller}
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pre.smalllisp {font-size: smaller}
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span.nolinebreak {white-space: nowrap}
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span.roman {font-family: initial; font-weight: normal}
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span.sansserif {font-family: sans-serif; font-weight: normal}
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en">
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<a name="Help"></a>
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<div class="header">
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<p>
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Previous: <a href="Completion.html#Completion" accesskey="p" rel="prev">Completion</a>, Up: <a href="Commands.html#Commands" accesskey="u" rel="up">Commands</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Getting-Help"></a>
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<h3 class="section">3.3 Getting Help</h3>
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<a name="index-online-documentation"></a>
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<a name="index-help"></a>
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<p>You can always ask <small>GDB</small> itself for information on its commands,
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using the command <code>help</code>.
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</p>
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<dl compact="compact">
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<dd><a name="index-h-_0028help_0029"></a>
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</dd>
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<dt><code>help</code></dt>
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<dt><code>h</code></dt>
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<dd><p>You can use <code>help</code> (abbreviated <code>h</code>) with no arguments to
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display a short list of named classes of commands:
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</p>
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<div class="smallexample">
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<pre class="smallexample">(gdb) help
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List of classes of commands:
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aliases -- Aliases of other commands
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breakpoints -- Making program stop at certain points
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data -- Examining data
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files -- Specifying and examining files
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internals -- Maintenance commands
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obscure -- Obscure features
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running -- Running the program
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stack -- Examining the stack
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status -- Status inquiries
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support -- Support facilities
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tracepoints -- Tracing of program execution without
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stopping the program
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user-defined -- User-defined commands
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Type "help" followed by a class name for a list of
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commands in that class.
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Type "help" followed by command name for full
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documentation.
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Command name abbreviations are allowed if unambiguous.
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(gdb)
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</pre></div>
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</dd>
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<dt><code>help <var>class</var></code></dt>
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<dd><p>Using one of the general help classes as an argument, you can get a
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list of the individual commands in that class. For example, here is the
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help display for the class <code>status</code>:
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</p>
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<div class="smallexample">
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<pre class="smallexample">(gdb) help status
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Status inquiries.
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List of commands:
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info -- Generic command for showing things
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about the program being debugged
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show -- Generic command for showing things
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about the debugger
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Type "help" followed by command name for full
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documentation.
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Command name abbreviations are allowed if unambiguous.
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(gdb)
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</pre></div>
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</dd>
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<dt><code>help <var>command</var></code></dt>
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<dd><p>With a command name as <code>help</code> argument, <small>GDB</small> displays a
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short paragraph on how to use that command.
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</p>
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<a name="index-apropos"></a>
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</dd>
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<dt><code>apropos <var>args</var></code></dt>
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<dd><p>The <code>apropos</code> command searches through all of the <small>GDB</small>
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commands, and their documentation, for the regular expression specified in
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<var>args</var>. It prints out all matches found. For example:
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</p>
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<div class="smallexample">
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<pre class="smallexample">apropos alias
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</pre></div>
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<p>results in:
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</p>
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<div class="smallexample">
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<pre class="smallexample">alias -- Define a new command that is an alias of an existing command
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aliases -- Aliases of other commands
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d -- Delete some breakpoints or auto-display expressions
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del -- Delete some breakpoints or auto-display expressions
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delete -- Delete some breakpoints or auto-display expressions
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</pre></div>
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<a name="index-complete"></a>
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</dd>
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<dt><code>complete <var>args</var></code></dt>
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<dd><p>The <code>complete <var>args</var></code> command lists all the possible completions
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for the beginning of a command. Use <var>args</var> to specify the beginning of the
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command you want completed. For example:
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</p>
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<div class="smallexample">
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<pre class="smallexample">complete i
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</pre></div>
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<p>results in:
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</p>
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<div class="smallexample">
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<pre class="smallexample">if
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ignore
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info
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inspect
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</pre></div>
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<p>This is intended for use by <small>GNU</small> Emacs.
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</p></dd>
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</dl>
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<p>In addition to <code>help</code>, you can use the <small>GDB</small> commands <code>info</code>
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and <code>show</code> to inquire about the state of your program, or the state
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of <small>GDB</small> itself. Each command supports many topics of inquiry; this
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manual introduces each of them in the appropriate context. The listings
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under <code>info</code> and under <code>show</code> in the Command, Variable, and
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Function Index point to all the sub-commands. See <a href="Command-and-Variable-Index.html#Command-and-Variable-Index">Command and Variable Index</a>.
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</p>
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<dl compact="compact">
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<dd><a name="index-info"></a>
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<a name="index-i-_0028info_0029"></a>
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</dd>
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<dt><code>info</code></dt>
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<dd><p>This command (abbreviated <code>i</code>) is for describing the state of your
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program. For example, you can show the arguments passed to a function
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with <code>info args</code>, list the registers currently in use with <code>info
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registers</code>, or list the breakpoints you have set with <code>info breakpoints</code>.
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You can get a complete list of the <code>info</code> sub-commands with
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<code>help info</code><!-- /@w -->.
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</p>
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<a name="index-set"></a>
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</dd>
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<dt><code>set</code></dt>
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<dd><p>You can assign the result of an expression to an environment variable with
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<code>set</code>. For example, you can set the <small>GDB</small> prompt to a $-sign with
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<code>set prompt $</code>.
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</p>
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<a name="index-show"></a>
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</dd>
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<dt><code>show</code></dt>
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<dd><p>In contrast to <code>info</code>, <code>show</code> is for describing the state of
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<small>GDB</small> itself.
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You can change most of the things you can <code>show</code>, by using the
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related command <code>set</code>; for example, you can control what number
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system is used for displays with <code>set radix</code>, or simply inquire
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which is currently in use with <code>show radix</code>.
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</p>
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<a name="index-info-set"></a>
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<p>To display all the settable parameters and their current
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values, you can use <code>show</code> with no arguments; you may also use
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<code>info set</code>. Both commands produce the same display.
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</p></dd>
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</dl>
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<p>Here are several miscellaneous <code>show</code> subcommands, all of which are
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exceptional in lacking corresponding <code>set</code> commands:
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</p>
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<dl compact="compact">
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<dd><a name="index-show-version"></a>
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<a name="index-GDB-version-number"></a>
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</dd>
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<dt><code>show version</code></dt>
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<dd><p>Show what version of <small>GDB</small> is running. You should include this
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information in <small>GDB</small> bug-reports. If multiple versions of
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<small>GDB</small> are in use at your site, you may need to determine which
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version of <small>GDB</small> you are running; as <small>GDB</small> evolves, new
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commands are introduced, and old ones may wither away. Also, many
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system vendors ship variant versions of <small>GDB</small>, and there are
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variant versions of <small>GDB</small> in <small>GNU</small>/Linux distributions as well.
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The version number is the same as the one announced when you start
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<small>GDB</small>.
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</p>
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<a name="index-show-copying"></a>
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<a name="index-info-copying"></a>
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<a name="index-display-GDB-copyright"></a>
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</dd>
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<dt><code>show copying</code></dt>
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<dt><code>info copying</code></dt>
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<dd><p>Display information about permission for copying <small>GDB</small>.
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</p>
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<a name="index-show-warranty"></a>
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<a name="index-info-warranty"></a>
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</dd>
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<dt><code>show warranty</code></dt>
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<dt><code>info warranty</code></dt>
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<dd><p>Display the <small>GNU</small> “NO WARRANTY” statement, or a warranty,
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if your version of <small>GDB</small> comes with one.
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</p>
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<a name="index-show-configuration"></a>
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</dd>
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<dt><code>show configuration</code></dt>
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<dd><p>Display detailed information about the way <small>GDB</small> was configured
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when it was built. This displays the optional arguments passed to the
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<samp>configure</samp> script and also configuration parameters detected
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automatically by <code>configure</code>. When reporting a <small>GDB</small>
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bug (see <a href="GDB-Bugs.html#GDB-Bugs">GDB Bugs</a>), it is important to include this information in
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your report.
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</p>
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</dd>
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</dl>
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<hr>
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<div class="header">
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<p>
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Previous: <a href="Completion.html#Completion" accesskey="p" rel="prev">Completion</a>, Up: <a href="Commands.html#Commands" accesskey="u" rel="up">Commands</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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</body>
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</html>
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