77 lines
3.6 KiB
HTML
77 lines
3.6 KiB
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<title>History Interaction - Debugging with GDB</title>
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Using-History-Interactively.html#Using-History-Interactively" title="Using History Interactively">
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<body>
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<div class="node">
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<a name="History-Interaction"></a>
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<p>
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Up: <a rel="up" accesskey="u" href="Using-History-Interactively.html#Using-History-Interactively">Using History Interactively</a>
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<hr>
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</div>
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<h3 class="section">33.1 History Expansion</h3>
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<p><a name="index-history-expansion-3293"></a>
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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>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>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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<dfn>event</dfn>, and the portions of that line that are acted upon are
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called <dfn>words</dfn>. Various <dfn>modifiers</dfn> 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><span class="samp">!</span></samp>’ by default.
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<ul class="menu">
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<li><a accesskey="1" href="Event-Designators.html#Event-Designators">Event Designators</a>: How to specify which history line to use.
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<li><a accesskey="2" href="Word-Designators.html#Word-Designators">Word Designators</a>: Specifying which words are of interest.
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<li><a accesskey="3" href="Modifiers.html#Modifiers">Modifiers</a>: Modifying the results of substitution.
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</ul>
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</body></html>
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