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| <h3 class="section">32.1 History Expansion</h3> |
| |
| <p><a name="index-history-expansion-2289"></a> |
| 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>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>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 |
| <dfn>event</dfn>, and the portions of that line that are acted upon are |
| called <dfn>words</dfn>. Various <dfn>modifiers</dfn> 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><span class="samp">!</span></samp>’ by default. |
| |
| <ul class="menu"> |
| <li><a accesskey="1" href="Event-Designators.html#Event-Designators">Event Designators</a>: How to specify which history line to use. |
| <li><a accesskey="2" href="Word-Designators.html#Word-Designators">Word Designators</a>: Specifying which words are of interest. |
| <li><a accesskey="3" href="Modifiers.html#Modifiers">Modifiers</a>: Modifying the results of substitution. |
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