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