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<a name="GDB_002fMI-Input-Syntax-1"></a>
<h4 class="subsection">27.2.1 <small>GDB/MI</small> Input Syntax</h4>

<a name="index-input-syntax-for-GDB_002fMI"></a>
<a name="index-GDB_002fMI_002c-input-syntax"></a>
<dl compact="compact">
<dt><code><var>command</var> &rarr;</code></dt>
<dd><p><code><var>cli-command</var> | <var>mi-command</var></code>
</p>
</dd>
<dt><code><var>cli-command</var> &rarr;</code></dt>
<dd><p><code>[ <var>token</var> ] <var>cli-command</var> <var>nl</var></code>, where
<var>cli-command</var> is any existing <small>GDB</small> CLI command.
</p>
</dd>
<dt><code><var>mi-command</var> &rarr;</code></dt>
<dd><p><code>[ <var>token</var> ] &quot;-&quot; <var>operation</var> ( &quot; &quot; <var>option</var> )*
<code>[</code> &quot; --&quot; <code>]</code> ( &quot; &quot; <var>parameter</var> )* <var>nl</var></code>
</p>
</dd>
<dt><code><var>token</var> &rarr;</code></dt>
<dd><p>&quot;any sequence of digits&quot;
</p>
</dd>
<dt><code><var>option</var> &rarr;</code></dt>
<dd><p><code>&quot;-&quot; <var>parameter</var> [ &quot; &quot; <var>parameter</var> ]</code>
</p>
</dd>
<dt><code><var>parameter</var> &rarr;</code></dt>
<dd><p><code><var>non-blank-sequence</var> | <var>c-string</var></code>
</p>
</dd>
<dt><code><var>operation</var> &rarr;</code></dt>
<dd><p><em>any of the operations described in this chapter</em>
</p>
</dd>
<dt><code><var>non-blank-sequence</var> &rarr;</code></dt>
<dd><p><em>anything, provided it doesn&rsquo;t contain special characters such as
&quot;-&quot;, <var>nl</var>, &quot;&quot;&quot; and of course &quot; &quot;</em>
</p>
</dd>
<dt><code><var>c-string</var> &rarr;</code></dt>
<dd><p><code>&quot;&quot;&quot; <var>seven-bit-iso-c-string-content</var> &quot;&quot;&quot;</code>
</p>
</dd>
<dt><code><var>nl</var> &rarr;</code></dt>
<dd><p><code>CR | CR-LF</code>
</p></dd>
</dl>

<p>Notes:
</p>
<ul>
<li> The CLI commands are still handled by the <small>MI</small> interpreter; their
output is described below.

</li><li> The <code><var>token</var></code>, when present, is passed back when the command
finishes.

</li><li> Some <small>MI</small> commands accept optional arguments as part of the parameter
list.  Each option is identified by a leading &lsquo;<samp>-</samp>&rsquo; (dash) and may be
followed by an optional argument parameter.  Options occur first in the
parameter list and can be delimited from normal parameters using
&lsquo;<samp>--</samp>&rsquo; (this is useful when some parameters begin with a dash).
</li></ul>

<p>Pragmatics:
</p>
<ul>
<li> We want easy access to the existing CLI syntax (for debugging).

</li><li> We want it to be easy to spot a <small>MI</small> operation.
</li></ul>


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