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<h4 class="subsection">33.1.1 Event Designators</h4>

<p><a name="index-event-designators-3294"></a>
An event designator is a reference to a command line entry in the
history list. 
Unless the reference is absolute, events are relative to the current
position in the history list. 
<a name="index-history-events-3295"></a>
     <dl>
<dt><code>!</code><dd>Start a history substitution, except when followed by a space, tab,
the end of the line, or &lsquo;<samp><span class="samp">=</span></samp>&rsquo;.

     <br><dt><code>!</code><var>n</var><dd>Refer to command line <var>n</var>.

     <br><dt><code>!-</code><var>n</var><dd>Refer to the command <var>n</var> lines back.

     <br><dt><code>!!</code><dd>Refer to the previous command.  This is a synonym for &lsquo;<samp><span class="samp">!-1</span></samp>&rsquo;.

     <br><dt><code>!</code><var>string</var><dd>Refer to the most recent command
preceding the current position in the history list
starting with <var>string</var>.

     <br><dt><code>!?</code><var>string</var><code>[?]</code><dd>Refer to the most recent command
preceding the current position in the history list
containing <var>string</var>. 
The trailing
&lsquo;<samp><span class="samp">?</span></samp>&rsquo; may be omitted if the <var>string</var> is followed immediately by
a newline.

     <br><dt><code>^</code><var>string1</var><code>^</code><var>string2</var><code>^</code><dd>Quick Substitution.  Repeat the last command, replacing <var>string1</var>
with <var>string2</var>.  Equivalent to
<code>!!:s/</code><var>string1</var><code>/</code><var>string2</var><code>/</code>.

     <br><dt><code>!#</code><dd>The entire command line typed so far.

   </dl>

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