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222 lines
9.8 KiB
HTML
222 lines
9.8 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>Command History (Debugging with GDB)</title>
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<meta name="description" content="Command History (Debugging with GDB)">
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<meta name="keywords" content="Command History (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="Controlling-GDB.html#Controlling-GDB" rel="up" title="Controlling GDB">
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<link href="Screen-Size.html#Screen-Size" rel="next" title="Screen Size">
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<link href="Editing.html#Editing" rel="prev" title="Editing">
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<style type="text/css">
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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="Command-History"></a>
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<div class="header">
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<p>
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Next: <a href="Screen-Size.html#Screen-Size" accesskey="n" rel="next">Screen Size</a>, Previous: <a href="Editing.html#Editing" accesskey="p" rel="prev">Editing</a>, Up: <a href="Controlling-GDB.html#Controlling-GDB" accesskey="u" rel="up">Controlling GDB</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-History-1"></a>
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<h3 class="section">22.3 Command History</h3>
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<a name="index-command-history"></a>
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<p><small>GDB</small> can keep track of the commands you type during your
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debugging sessions, so that you can be certain of precisely what
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happened. Use these commands to manage the <small>GDB</small> command
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history facility.
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</p>
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<p><small>GDB</small> uses the <small>GNU</small> History library, a part of the Readline
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package, to provide the history facility.
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See <a href="Using-History-Interactively.html#Using-History-Interactively">Using History Interactively</a>,
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for the detailed description of the History library.
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</p>
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<p>To issue a command to <small>GDB</small> without affecting certain aspects of
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the state which is seen by users, prefix it with ‘<samp>server </samp>’
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(see <a href="Server-Prefix.html#Server-Prefix">Server Prefix</a>). This
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means that this command will not affect the command history, nor will it
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affect <small>GDB</small>’s notion of which command to repeat if <tt class="key">RET</tt> is
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pressed on a line by itself.
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</p>
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<a name="index-server_002c-command-prefix"></a>
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<p>The server prefix does not affect the recording of values into the value
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history; to print a value without recording it into the value history,
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use the <code>output</code> command instead of the <code>print</code> command.
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</p>
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<p>Here is the description of <small>GDB</small> commands related to command
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history.
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</p>
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<dl compact="compact">
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<dd><a name="index-history-substitution"></a>
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<a name="index-history-file"></a>
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<a name="index-set-history-filename"></a>
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<a name="index-GDBHISTFILE_002c-environment-variable"></a>
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</dd>
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<dt><code>set history filename <var>fname</var></code></dt>
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<dd><p>Set the name of the <small>GDB</small> command history file to <var>fname</var>.
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This is the file where <small>GDB</small> reads an initial command history
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list, and where it writes the command history from this session when it
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exits. You can access this list through history expansion or through
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the history command editing characters listed below. This file defaults
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to the value of the environment variable <code>GDBHISTFILE</code>, or to
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<samp>./.gdb_history</samp> (<samp>./_gdb_history</samp> on MS-DOS) if this variable
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is not set.
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</p>
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<a name="index-save-command-history"></a>
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<a name="index-set-history-save"></a>
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</dd>
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<dt><code>set history save</code></dt>
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<dt><code>set history save on</code></dt>
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<dd><p>Record command history in a file, whose name may be specified with the
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<code>set history filename</code> command. By default, this option is disabled.
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</p>
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</dd>
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<dt><code>set history save off</code></dt>
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<dd><p>Stop recording command history in a file.
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</p>
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<a name="index-history-size"></a>
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<a name="index-set-history-size"></a>
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<a name="index-GDBHISTSIZE_002c-environment-variable"></a>
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</dd>
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<dt><code>set history size <var>size</var></code></dt>
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<dt><code>set history size unlimited</code></dt>
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<dd><p>Set the number of commands which <small>GDB</small> keeps in its history list.
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This defaults to the value of the environment variable <code>GDBHISTSIZE</code>, or
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to 256 if this variable is not set. Non-numeric values of <code>GDBHISTSIZE</code>
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are ignored. If <var>size</var> is <code>unlimited</code> or if <code>GDBHISTSIZE</code> is
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either a negative number or the empty string, then the number of commands
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<small>GDB</small> keeps in the history list is unlimited.
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</p>
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<a name="index-remove-duplicate-history"></a>
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<a name="index-set-history-remove_002dduplicates"></a>
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</dd>
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<dt><code>set history remove-duplicates <var>count</var></code></dt>
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<dt><code>set history remove-duplicates unlimited</code></dt>
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<dd><p>Control the removal of duplicate history entries in the command history list.
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If <var>count</var> is non-zero, <small>GDB</small> will look back at the last <var>count</var>
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history entries and remove the first entry that is a duplicate of the current
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entry being added to the command history list. If <var>count</var> is
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<code>unlimited</code> then this lookbehind is unbounded. If <var>count</var> is 0, then
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removal of duplicate history entries is disabled.
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</p>
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<p>Only history entries added during the current session are considered for
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removal. This option is set to 0 by default.
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</p>
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</dd>
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</dl>
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<p>History expansion assigns special meaning to the character <kbd>!</kbd>.
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See <a href="Event-Designators.html#Event-Designators">Event Designators</a>,
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for more details.
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</p>
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<a name="index-history-expansion_002c-turn-on_002foff"></a>
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<p>Since <kbd>!</kbd> is also the logical not operator in C, history expansion
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is off by default. If you decide to enable history expansion with the
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<code>set history expansion on</code> command, you may sometimes need to
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follow <kbd>!</kbd> (when it is used as logical not, in an expression) with
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a space or a tab to prevent it from being expanded. The readline
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history facilities do not attempt substitution on the strings
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<kbd>!=</kbd> and <kbd>!(</kbd>, even when history expansion is enabled.
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</p>
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<p>The commands to control history expansion are:
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</p>
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<dl compact="compact">
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<dt><code>set history expansion on</code></dt>
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<dt><code>set history expansion</code></dt>
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<dd><a name="index-set-history-expansion"></a>
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<p>Enable history expansion. History expansion is off by default.
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</p>
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</dd>
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<dt><code>set history expansion off</code></dt>
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<dd><p>Disable history expansion.
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</p>
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<a name="index-show-history"></a>
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</dd>
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<dt><code>show history</code></dt>
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<dt><code>show history filename</code></dt>
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<dt><code>show history save</code></dt>
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<dt><code>show history size</code></dt>
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<dt><code>show history expansion</code></dt>
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<dd><p>These commands display the state of the <small>GDB</small> history parameters.
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<code>show history</code> by itself displays all four states.
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</p></dd>
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</dl>
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<dl compact="compact">
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<dd><a name="index-show-commands"></a>
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<a name="index-show-last-commands"></a>
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<a name="index-display-command-history"></a>
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</dd>
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<dt><code>show commands</code></dt>
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<dd><p>Display the last ten commands in the command history.
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</p>
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</dd>
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<dt><code>show commands <var>n</var></code></dt>
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<dd><p>Print ten commands centered on command number <var>n</var>.
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</p>
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</dd>
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<dt><code>show commands +</code></dt>
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<dd><p>Print ten commands just after the commands last printed.
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</p></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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Next: <a href="Screen-Size.html#Screen-Size" accesskey="n" rel="next">Screen Size</a>, Previous: <a href="Editing.html#Editing" accesskey="p" rel="prev">Editing</a>, Up: <a href="Controlling-GDB.html#Controlling-GDB" accesskey="u" rel="up">Controlling GDB</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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