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| <title>Debugging with GDB: History Interaction</title> |
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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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| <a name="History-Expansion"></a> |
| <h3 class="section">33.1 History Expansion</h3> |
| <a name="index-history-expansion"></a> |
| |
| <p>The History library provides a history expansion feature that is similar |
| to the history expansion provided by <code>csh</code>. This section |
| describes the syntax used to manipulate the history information. |
| </p> |
| <p>History expansions introduce words from the history list into |
| the input stream, making it easy to repeat commands, insert the |
| arguments to a previous command into the current input line, or |
| fix errors in previous commands quickly. |
| </p> |
| <p>History expansion takes place in two parts. The first is to determine |
| which line from the history list should be used during substitution. |
| The second is to select portions of that line for inclusion into the |
| current one. The line selected from the history is called the |
| <em>event</em>, and the portions of that line that are acted upon are |
| called <em>words</em>. Various <em>modifiers</em> are available to manipulate |
| the selected words. The line is broken into words in the same fashion |
| that Bash does, so that several words |
| surrounded by quotes are considered one word. |
| History expansions are introduced by the appearance of the |
| history expansion character, which is ‘<samp>!</samp>’ by default. |
| </p> |
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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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| <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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| <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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