152 lines
8.5 KiB
HTML
152 lines
8.5 KiB
HTML
<html lang="en">
|
|
<head>
|
|
<title>Command History - Debugging with GDB</title>
|
|
<meta http-equiv="Content-Type" content="text/html">
|
|
<meta name="description" content="Debugging with GDB">
|
|
<meta name="generator" content="makeinfo 4.13">
|
|
<link title="Top" rel="start" href="index.html#Top">
|
|
<link rel="up" href="Controlling-GDB.html#Controlling-GDB" title="Controlling GDB">
|
|
<link rel="prev" href="Editing.html#Editing" title="Editing">
|
|
<link rel="next" href="Screen-Size.html#Screen-Size" title="Screen Size">
|
|
<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
|
|
<!--
|
|
Copyright (C) 1988-2019 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.''
|
|
-->
|
|
<meta http-equiv="Content-Style-Type" content="text/css">
|
|
<style type="text/css"><!--
|
|
pre.display { font-family:inherit }
|
|
pre.format { font-family:inherit }
|
|
pre.smalldisplay { font-family:inherit; font-size:smaller }
|
|
pre.smallformat { font-family:inherit; font-size:smaller }
|
|
pre.smallexample { font-size:smaller }
|
|
pre.smalllisp { font-size:smaller }
|
|
span.sc { font-variant:small-caps }
|
|
span.roman { font-family:serif; font-weight:normal; }
|
|
span.sansserif { font-family:sans-serif; font-weight:normal; }
|
|
--></style>
|
|
</head>
|
|
<body>
|
|
<div class="node">
|
|
<a name="Command-History"></a>
|
|
<p>
|
|
Next: <a rel="next" accesskey="n" href="Screen-Size.html#Screen-Size">Screen Size</a>,
|
|
Previous: <a rel="previous" accesskey="p" href="Editing.html#Editing">Editing</a>,
|
|
Up: <a rel="up" accesskey="u" href="Controlling-GDB.html#Controlling-GDB">Controlling GDB</a>
|
|
<hr>
|
|
</div>
|
|
|
|
<h3 class="section">22.3 Command History</h3>
|
|
|
|
<p><a name="index-command-history-1660"></a>
|
|
<span class="sc">gdb</span> can keep track of the commands you type during your
|
|
debugging sessions, so that you can be certain of precisely what
|
|
happened. Use these commands to manage the <span class="sc">gdb</span> command
|
|
history facility.
|
|
|
|
<p><span class="sc">gdb</span> uses the <span class="sc">gnu</span> History library, a part of the Readline
|
|
package, to provide the history facility.
|
|
See <a href="Using-History-Interactively.html#Using-History-Interactively">Using History Interactively</a>,
|
|
for the detailed description of the History library.
|
|
|
|
<p>To issue a command to <span class="sc">gdb</span> without affecting certain aspects of
|
|
the state which is seen by users, prefix it with ‘<samp><span class="samp">server </span></samp>’
|
|
(see <a href="Server-Prefix.html#Server-Prefix">Server Prefix</a>). This
|
|
means that this command will not affect the command history, nor will it
|
|
affect <span class="sc">gdb</span>'s notion of which command to repeat if <RET> is
|
|
pressed on a line by itself.
|
|
|
|
<p><a name="index-g_t_0040code_007bserver_007d_002c-command-prefix-1661"></a>The server prefix does not affect the recording of values into the value
|
|
history; to print a value without recording it into the value history,
|
|
use the <code>output</code> command instead of the <code>print</code> command.
|
|
|
|
<p>Here is the description of <span class="sc">gdb</span> commands related to command
|
|
history.
|
|
|
|
|
|
<a name="index-history-substitution-1662"></a>
|
|
<a name="index-history-file-1663"></a>
|
|
<a name="index-set-history-filename-1664"></a>
|
|
<a name="index-g_t_0040env_007bGDBHISTFILE_007d_002c-environment-variable-1665"></a>
|
|
<dl><dt><code>set history filename </code><var>fname</var><dd>Set the name of the <span class="sc">gdb</span> command history file to <var>fname</var>.
|
|
This is the file where <span class="sc">gdb</span> reads an initial command history
|
|
list, and where it writes the command history from this session when it
|
|
exits. You can access this list through history expansion or through
|
|
the history command editing characters listed below. This file defaults
|
|
to the value of the environment variable <code>GDBHISTFILE</code>, or to
|
|
<samp><span class="file">./.gdb_history</span></samp> (<samp><span class="file">./_gdb_history</span></samp> on MS-DOS) if this variable
|
|
is not set.
|
|
|
|
<p><a name="index-save-command-history-1666"></a><a name="index-set-history-save-1667"></a><br><dt><code>set history save</code><dt><code>set history save on</code><dd>Record command history in a file, whose name may be specified with the
|
|
<code>set history filename</code> command. By default, this option is disabled.
|
|
|
|
<br><dt><code>set history save off</code><dd>Stop recording command history in a file.
|
|
|
|
<p><a name="index-history-size-1668"></a><a name="index-set-history-size-1669"></a><a name="index-g_t_0040env_007bGDBHISTSIZE_007d_002c-environment-variable-1670"></a><br><dt><code>set history size </code><var>size</var><dt><code>set history size unlimited</code><dd>Set the number of commands which <span class="sc">gdb</span> keeps in its history list.
|
|
This defaults to the value of the environment variable <samp><span class="env">GDBHISTSIZE</span></samp>, or
|
|
to 256 if this variable is not set. Non-numeric values of <samp><span class="env">GDBHISTSIZE</span></samp>
|
|
are ignored. If <var>size</var> is <code>unlimited</code> or if <samp><span class="env">GDBHISTSIZE</span></samp> is
|
|
either a negative number or the empty string, then the number of commands
|
|
<span class="sc">gdb</span> keeps in the history list is unlimited.
|
|
|
|
<p><a name="index-remove-duplicate-history-1671"></a><a name="index-set-history-remove_002dduplicates-1672"></a><br><dt><code>set history remove-duplicates </code><var>count</var><dt><code>set history remove-duplicates unlimited</code><dd>Control the removal of duplicate history entries in the command history list.
|
|
If <var>count</var> is non-zero, <span class="sc">gdb</span> will look back at the last <var>count</var>
|
|
history entries and remove the first entry that is a duplicate of the current
|
|
entry being added to the command history list. If <var>count</var> is
|
|
<code>unlimited</code> then this lookbehind is unbounded. If <var>count</var> is 0, then
|
|
removal of duplicate history entries is disabled.
|
|
|
|
<p>Only history entries added during the current session are considered for
|
|
removal. This option is set to 0 by default.
|
|
|
|
</dl>
|
|
|
|
<p>History expansion assigns special meaning to the character <kbd>!</kbd>.
|
|
See <a href="Event-Designators.html#Event-Designators">Event Designators</a>,
|
|
for more details.
|
|
|
|
<p><a name="index-history-expansion_002c-turn-on_002foff-1673"></a>Since <kbd>!</kbd> is also the logical not operator in C, history expansion
|
|
is off by default. If you decide to enable history expansion with the
|
|
<code>set history expansion on</code> command, you may sometimes need to
|
|
follow <kbd>!</kbd> (when it is used as logical not, in an expression) with
|
|
a space or a tab to prevent it from being expanded. The readline
|
|
history facilities do not attempt substitution on the strings
|
|
<kbd>!=</kbd> and <kbd>!(</kbd>, even when history expansion is enabled.
|
|
|
|
<p>The commands to control history expansion are:
|
|
|
|
<dl>
|
|
<dt><code>set history expansion on</code><dt><code>set history expansion</code><dd><a name="index-set-history-expansion-1674"></a>Enable history expansion. History expansion is off by default.
|
|
|
|
<br><dt><code>set history expansion off</code><dd>Disable history expansion.
|
|
|
|
<!-- @group -->
|
|
<p><a name="index-show-history-1675"></a><br><dt><code>show history</code><dt><code>show history filename</code><dt><code>show history save</code><dt><code>show history size</code><dt><code>show history expansion</code><dd>These commands display the state of the <span class="sc">gdb</span> history parameters.
|
|
<code>show history</code> by itself displays all four states.
|
|
<!-- @end group -->
|
|
</dl>
|
|
|
|
|
|
<a name="index-show-commands-1676"></a>
|
|
<a name="index-show-last-commands-1677"></a>
|
|
<a name="index-display-command-history-1678"></a>
|
|
<dl><dt><code>show commands</code><dd>Display the last ten commands in the command history.
|
|
|
|
<br><dt><code>show commands </code><var>n</var><dd>Print ten commands centered on command number <var>n</var>.
|
|
|
|
<br><dt><code>show commands +</code><dd>Print ten commands just after the commands last printed.
|
|
</dl>
|
|
|
|
</body></html>
|
|
|