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<section>
<h1 id="count">count</h1>
<h2 id="syntax">Syntax</h2>
<pre class="shell"><code>    dataset count COLLECTION_NAME [FILTER EXPRESSION]</code></pre>
<h2 id="description">Description</h2>
<p>This returns a count of the keys in the collection. It is reasonable
quick as only the collection metadata is read in. <em>count</em> also
can accept a filter expression. This is slower as it iterates over all
the records and counts those which evaluate to true based on the filter
expression provided.</p>
<h2 id="usage">Usage</h2>
<p>Count all records in collection “publications.ds”</p>
<pre class="shell"><code>    dataset count &quot;publications.ds&quot;</code></pre>
<p>Count records where the “.published” field is true.</p>
<pre class="shell"><code>    dataset count &quot;publications.ds&quot; &#39;(eq .published true)&#39;</code></pre>
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