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<a name="Common-Options-1"></a>
<h2 class="chapter">16 Common Options</h2>

<p>The following command-line options are supported by all of the
programs described in this manual.
</p>
<dl compact="compact">
<dt><code>@<var>file</var></code></dt>
<dd><p>Read command-line options from <var>file</var>.  The options read are
inserted in place of the original @<var>file</var> option.  If <var>file</var>
does not exist, or cannot be read, then the option will be treated
literally, and not removed.  
</p>
<p>Options in <var>file</var> are separated by whitespace.  A whitespace
character may be included in an option by surrounding the entire
option in either single or double quotes.  Any character (including a
backslash) may be included by prefixing the character to be included
with a backslash.  The <var>file</var> may itself contain additional
@<var>file</var> options; any such options will be processed recursively.
</p>
</dd>
<dt><code>--help</code></dt>
<dd><p>Display the command-line options supported by the program.
</p>
</dd>
<dt><code>--version</code></dt>
<dd><p>Display the version number of the program.
</p>
</dd>
</dl>


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