101 lines
4.8 KiB
HTML
101 lines
4.8 KiB
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<title>Word Designators - Debugging with GDB</title>
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<link rel="up" href="History-Interaction.html#History-Interaction" title="History Interaction">
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<link rel="prev" href="Event-Designators.html#Event-Designators" title="Event Designators">
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<div class="node">
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<a name="Word-Designators"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Modifiers.html#Modifiers">Modifiers</a>,
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Previous: <a rel="previous" accesskey="p" href="Event-Designators.html#Event-Designators">Event Designators</a>,
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Up: <a rel="up" accesskey="u" href="History-Interaction.html#History-Interaction">History Interaction</a>
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<hr>
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</div>
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<h4 class="subsection">33.1.2 Word Designators</h4>
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<p>Word designators are used to select desired words from the event.
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A ‘<samp><span class="samp">:</span></samp>’ separates the event specification from the word designator. It
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may be omitted if the word designator begins with a ‘<samp><span class="samp">^</span></samp>’, ‘<samp><span class="samp">$</span></samp>’,
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‘<samp><span class="samp">*</span></samp>’, ‘<samp><span class="samp">-</span></samp>’, or ‘<samp><span class="samp">%</span></samp>’. Words are numbered from the beginning
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of the line, with the first word being denoted by 0 (zero). Words are
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inserted into the current line separated by single spaces.
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<p>For example,
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<dl>
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<dt><code>!!</code><dd>designates the preceding command. When you type this, the preceding
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command is repeated in toto.
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<br><dt><code>!!:$</code><dd>designates the last argument of the preceding command. This may be
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shortened to <code>!$</code>.
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<br><dt><code>!fi:2</code><dd>designates the second argument of the most recent command starting with
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the letters <code>fi</code>.
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</dl>
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<p>Here are the word designators:
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<dl>
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<dt><code>0 (zero)</code><dd>The <code>0</code>th word. For many applications, this is the command word.
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<br><dt><var>n</var><dd>The <var>n</var>th word.
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<br><dt><code>^</code><dd>The first argument; that is, word 1.
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<br><dt><code>$</code><dd>The last argument.
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<br><dt><code>%</code><dd>The word matched by the most recent ‘<samp><span class="samp">?</span><var>string</var><span class="samp">?</span></samp>’ search.
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<br><dt><var>x</var><code>-</code><var>y</var><dd>A range of words; ‘<samp><span class="samp">-</span><var>y</var></samp>’ abbreviates ‘<samp><span class="samp">0-</span><var>y</var></samp>’.
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<br><dt><code>*</code><dd>All of the words, except the <code>0</code>th. This is a synonym for ‘<samp><span class="samp">1-$</span></samp>’.
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It is not an error to use ‘<samp><span class="samp">*</span></samp>’ if there is just one word in the event;
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the empty string is returned in that case.
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<br><dt><var>x</var><code>*</code><dd>Abbreviates ‘<samp><var>x</var><span class="samp">-$</span></samp>’
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<br><dt><var>x</var><code>-</code><dd>Abbreviates ‘<samp><var>x</var><span class="samp">-$</span></samp>’ like ‘<samp><var>x</var><span class="samp">*</span></samp>’, but omits the last word.
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</dl>
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<p>If a word designator is supplied without an event specification, the
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previous command is used as the event.
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</body></html>
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