172 lines
7.7 KiB
HTML
172 lines
7.7 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
|
<html>
|
|
<!-- Copyright (C) 1988-2021 Free Software Foundation, Inc.
|
|
|
|
Permission is granted to copy, distribute and/or modify this document
|
|
under the terms of the GNU Free Documentation License, Version 1.3 or
|
|
any later version published by the Free Software Foundation; with the
|
|
Invariant Sections being "Free Software" and "Free Software Needs
|
|
Free Documentation", with the Front-Cover Texts being "A GNU Manual,"
|
|
and with the Back-Cover Texts as in (a) below.
|
|
|
|
(a) The FSF's Back-Cover Text is: "You are free to copy and modify
|
|
this GNU Manual. Buying copies from GNU Press supports the FSF in
|
|
developing GNU and promoting software freedom." -->
|
|
<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ -->
|
|
<head>
|
|
<title>Debugging with GDB: Command Settings</title>
|
|
|
|
<meta name="description" content="Debugging with GDB: Command Settings">
|
|
<meta name="keywords" content="Debugging with GDB: Command Settings">
|
|
<meta name="resource-type" content="document">
|
|
<meta name="distribution" content="global">
|
|
<meta name="Generator" content="makeinfo">
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
|
<link href="index.html#Top" rel="start" title="Top">
|
|
<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
|
|
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
|
|
<link href="Commands.html#Commands" rel="up" title="Commands">
|
|
<link href="Completion.html#Completion" rel="next" title="Completion">
|
|
<link href="Command-Syntax.html#Command-Syntax" rel="previous" title="Command Syntax">
|
|
<style type="text/css">
|
|
<!--
|
|
a.summary-letter {text-decoration: none}
|
|
blockquote.smallquotation {font-size: smaller}
|
|
div.display {margin-left: 3.2em}
|
|
div.example {margin-left: 3.2em}
|
|
div.indentedblock {margin-left: 3.2em}
|
|
div.lisp {margin-left: 3.2em}
|
|
div.smalldisplay {margin-left: 3.2em}
|
|
div.smallexample {margin-left: 3.2em}
|
|
div.smallindentedblock {margin-left: 3.2em; font-size: smaller}
|
|
div.smalllisp {margin-left: 3.2em}
|
|
kbd {font-style:oblique}
|
|
pre.display {font-family: inherit}
|
|
pre.format {font-family: inherit}
|
|
pre.menu-comment {font-family: serif}
|
|
pre.menu-preformatted {font-family: serif}
|
|
pre.smalldisplay {font-family: inherit; font-size: smaller}
|
|
pre.smallexample {font-size: smaller}
|
|
pre.smallformat {font-family: inherit; font-size: smaller}
|
|
pre.smalllisp {font-size: smaller}
|
|
span.nocodebreak {white-space:nowrap}
|
|
span.nolinebreak {white-space:nowrap}
|
|
span.roman {font-family:serif; font-weight:normal}
|
|
span.sansserif {font-family:sans-serif; font-weight:normal}
|
|
ul.no-bullet {list-style: none}
|
|
-->
|
|
</style>
|
|
|
|
|
|
</head>
|
|
|
|
<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
|
|
<a name="Command-Settings"></a>
|
|
<div class="header">
|
|
<p>
|
|
Next: <a href="Completion.html#Completion" accesskey="n" rel="next">Completion</a>, Previous: <a href="Command-Syntax.html#Command-Syntax" accesskey="p" rel="previous">Command Syntax</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>
|
|
</div>
|
|
<hr>
|
|
<a name="Command-Settings-1"></a>
|
|
<h3 class="section">3.2 Command Settings</h3>
|
|
<a name="index-default-behavior-of-commands_002c-changing"></a>
|
|
<a name="index-default-settings_002c-changing"></a>
|
|
|
|
<p>Many commands change their behavior according to command-specific
|
|
variables or settings. These settings can be changed with the
|
|
<code>set</code> subcommands. For example, the <code>print</code> command
|
|
(see <a href="Data.html#Data">Examining Data</a>) prints arrays differently depending on
|
|
settings changeable with the commands <code>set print elements
|
|
NUMBER-OF-ELEMENTS</code> and <code>set print array-indexes</code>, among others.
|
|
</p>
|
|
<p>You can change these settings to your preference in the gdbinit files
|
|
loaded at <small>GDB</small> startup. See <a href="Startup.html#Startup">Startup</a>.
|
|
</p>
|
|
<p>The settings can also be changed interactively during the debugging
|
|
session. For example, to change the limit of array elements to print,
|
|
you can do the following:
|
|
</p><div class="smallexample">
|
|
<pre class="smallexample">(GDB) set print elements 10
|
|
(GDB) print some_array
|
|
$1 = {0, 10, 20, 30, 40, 50, 60, 70, 80, 90...}
|
|
</pre></div>
|
|
|
|
<p>The above <code>set print elements 10</code> command changes the number of
|
|
elements to print from the default of 200 to 10. If you only intend
|
|
this limit of 10 to be used for printing <code>some_array</code>, then you
|
|
must restore the limit back to 200, with <code>set print elements
|
|
200</code>.
|
|
</p>
|
|
<p>Some commands allow overriding settings with command options. For
|
|
example, the <code>print</code> command supports a number of options that
|
|
allow overriding relevant global print settings as set by <code>set
|
|
print</code> subcommands. See <a href="Data.html#print-options">print options</a>. The example above could be
|
|
rewritten as:
|
|
</p><div class="smallexample">
|
|
<pre class="smallexample">(GDB) print -elements 10 -- some_array
|
|
$1 = {0, 10, 20, 30, 40, 50, 60, 70, 80, 90...}
|
|
</pre></div>
|
|
|
|
<p>Alternatively, you can use the <code>with</code> command to change a setting
|
|
temporarily, for the duration of a command invocation.
|
|
</p>
|
|
<dl compact="compact">
|
|
<dd><a name="index-with-command"></a>
|
|
<a name="index-w-_0028with_0029"></a>
|
|
<a name="index-settings"></a>
|
|
<a name="index-temporarily-change-settings"></a>
|
|
</dd>
|
|
<dt><code>with <var>setting</var> [<var>value</var>] [-- <var>command</var>]</code></dt>
|
|
<dt><code>w <var>setting</var> [<var>value</var>] [-- <var>command</var>]</code></dt>
|
|
<dd><p>Temporarily set <var>setting</var> to <var>value</var> for the duration of
|
|
<var>command</var>.
|
|
</p>
|
|
<p><var>setting</var> is any setting you can change with the <code>set</code>
|
|
subcommands. <var>value</var> is the value to assign to <code>setting</code>
|
|
while running <code>command</code>.
|
|
</p>
|
|
<p>If no <var>command</var> is provided, the last command executed is
|
|
repeated.
|
|
</p>
|
|
<p>If a <var>command</var> is provided, it must be preceded by a double dash
|
|
(<code>--</code>) separator. This is required because some settings accept
|
|
free-form arguments, such as expressions or filenames.
|
|
</p>
|
|
<p>For example, the command
|
|
</p><div class="smallexample">
|
|
<pre class="smallexample">(GDB) with print array on -- print some_array
|
|
</pre></div>
|
|
<p>is equivalent to the following 3 commands:
|
|
</p><div class="smallexample">
|
|
<pre class="smallexample">(GDB) set print array on
|
|
(GDB) print some_array
|
|
(GDB) set print array off
|
|
</pre></div>
|
|
|
|
<p>The <code>with</code> command is particularly useful when you want to
|
|
override a setting while running user-defined commands, or commands
|
|
defined in Python or Guile. See <a href="Extending-GDB.html#Extending-GDB">Extending GDB</a>.
|
|
</p>
|
|
<div class="smallexample">
|
|
<pre class="smallexample">(GDB) with print pretty on -- my_complex_command
|
|
</pre></div>
|
|
|
|
<p>To change several settings for the same command, you can nest
|
|
<code>with</code> commands. For example, <code>with language ada -- with
|
|
print elements 10</code> temporarily changes the language to Ada and sets a
|
|
limit of 10 elements to print for arrays and strings.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
<hr>
|
|
<div class="header">
|
|
<p>
|
|
Next: <a href="Completion.html#Completion" accesskey="n" rel="next">Completion</a>, Previous: <a href="Command-Syntax.html#Command-Syntax" accesskey="p" rel="previous">Command Syntax</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>
|
|
</div>
|
|
|
|
|
|
|
|
</body>
|
|
</html>
|