<!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 Options</title>
|
|
<meta name="description" content="Debugging with GDB: Command Options">
|
<meta name="keywords" content="Debugging with GDB: Command Options">
|
<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="Command-aliases-default-args.html#Command-aliases-default-args" rel="next" title="Command aliases default args">
|
<link href="Completion.html#Completion" rel="previous" title="Completion">
|
<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-Options"></a>
|
<div class="header">
|
<p>
|
Next: <a href="Command-aliases-default-args.html#Command-aliases-default-args" accesskey="n" rel="next">Command aliases default args</a>, Previous: <a href="Completion.html#Completion" accesskey="p" rel="previous">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>
|
</div>
|
<hr>
|
<a name="Command-Options-1"></a>
|
<h3 class="section">3.4 Command Options</h3>
|
|
<a name="index-command-options"></a>
|
<p>Some commands accept options starting with a leading dash. For
|
example, <code>print -pretty</code>. Similarly to command names, you can
|
abbreviate a <small>GDB</small> option to the first few letters of the
|
option name, if that abbreviation is unambiguous, and you can also use
|
the <tt class="key">TAB</tt> key to get <small>GDB</small> to fill out the rest of a word
|
in an option (or to show you the alternatives available, if there is
|
more than one possibility).
|
</p>
|
<a name="index-command-options_002c-raw-input"></a>
|
<p>Some commands take raw input as argument. For example, the print
|
command processes arbitrary expressions in any of the languages
|
supported by <small>GDB</small>. With such commands, because raw input may
|
start with a leading dash that would be confused with an option or any
|
of its abbreviations, e.g. <code>print -p</code> (short for <code>print
|
-pretty</code> or printing negative <code>p</code>?), if you specify any command
|
option, then you must use a double-dash (<code>--</code>) delimiter to
|
indicate the end of options.
|
</p>
|
<a name="index-command-options_002c-boolean"></a>
|
|
<p>Some options are described as accepting an argument which can be
|
either <code>on</code> or <code>off</code>. These are known as <em>boolean
|
options</em>. Similarly to boolean settings commands—<code>on</code> and
|
<code>off</code> are the typical values, but any of <code>1</code>, <code>yes</code> and
|
<code>enable</code> can also be used as “true” value, and any of <code>0</code>,
|
<code>no</code> and <code>disable</code> can also be used as “false” value. You
|
can also omit a “true” value, as it is implied by default.
|
</p>
|
<p>For example, these are equivalent:
|
</p>
|
<div class="smallexample">
|
<pre class="smallexample">(gdb) print -object on -pretty off -element unlimited -- *myptr
|
(gdb) p -o -p 0 -e u -- *myptr
|
</pre></div>
|
|
<p>You can discover the set of options some command accepts by completing
|
on <code>-</code> after the command name. For example:
|
</p>
|
<div class="smallexample">
|
<pre class="smallexample">(gdb) print -<span class="key">TAB</span><span class="key">TAB</span>
|
-address -max-depth -raw-values -union
|
-array -null-stop -repeats -vtbl
|
-array-indexes -object -static-members
|
-elements -pretty -symbol
|
</pre></div>
|
|
<p>Completion will in some cases guide you with a suggestion of what kind
|
of argument an option expects. For example:
|
</p>
|
<div class="smallexample">
|
<pre class="smallexample">(gdb) print -elements <span class="key">TAB</span><span class="key">TAB</span>
|
NUMBER unlimited
|
</pre></div>
|
|
<p>Here, the option expects a number (e.g., <code>100</code>), not literal
|
<code>NUMBER</code>. Such metasyntactical arguments are always presented in
|
uppercase.
|
</p>
|
<p>(For more on using the <code>print</code> command, see <a href="Data.html#Data">Examining
|
Data</a>.)
|
</p>
|
<hr>
|
<div class="header">
|
<p>
|
Next: <a href="Command-aliases-default-args.html#Command-aliases-default-args" accesskey="n" rel="next">Command aliases default args</a>, Previous: <a href="Completion.html#Completion" accesskey="p" rel="previous">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>
|
</div>
|
|
|
|
</body>
|
</html>
|
