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109 lines
5.1 KiB
HTML
109 lines
5.1 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>History Interaction (Debugging with GDB)</title>
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<meta name="description" content="History Interaction (Debugging with GDB)">
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<meta name="keywords" content="History Interaction (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="Using-History-Interactively.html#Using-History-Interactively" rel="up" title="Using History Interactively">
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<link href="Event-Designators.html#Event-Designators" rel="next" title="Event Designators">
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<link href="Using-History-Interactively.html#Using-History-Interactively" rel="prev" title="Using History Interactively">
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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="History-Interaction"></a>
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<div class="header">
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<p>
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Up: <a href="Using-History-Interactively.html#Using-History-Interactively" accesskey="u" rel="up">Using History Interactively</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="History-Expansion"></a>
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<h3 class="section">33.1 History Expansion</h3>
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<a name="index-history-expansion"></a>
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<p>The History library provides a history expansion feature that is similar
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to the history expansion provided by <code>csh</code>. This section
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describes the syntax used to manipulate the history information.
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</p>
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<p>History expansions introduce words from the history list into
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the input stream, making it easy to repeat commands, insert the
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arguments to a previous command into the current input line, or
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fix errors in previous commands quickly.
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</p>
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<p>History expansion takes place in two parts. The first is to determine
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which line from the history list should be used during substitution.
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The second is to select portions of that line for inclusion into the
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current one. The line selected from the history is called the
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<em>event</em>, and the portions of that line that are acted upon are
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called <em>words</em>. Various <em>modifiers</em> are available to manipulate
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the selected words. The line is broken into words in the same fashion
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that Bash does, so that several words
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surrounded by quotes are considered one word.
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History expansions are introduced by the appearance of the
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history expansion character, which is ‘<samp>!</samp>’ by default.
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</p>
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<table class="menu" border="0" cellspacing="0">
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<tr><td align="left" valign="top">• <a href="Event-Designators.html#Event-Designators" accesskey="1">Event Designators</a>:</td><td> </td><td align="left" valign="top">How to specify which history line to use.
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Word-Designators.html#Word-Designators" accesskey="2">Word Designators</a>:</td><td> </td><td align="left" valign="top">Specifying which words are of interest.
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Modifiers.html#Modifiers" accesskey="3">Modifiers</a>:</td><td> </td><td align="left" valign="top">Modifying the results of substitution.
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</td></tr>
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</table>
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</body>
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</html>
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