ion can match any part of the commit message. To
match messages starting with a string, one can use e.g. <em>:/^foo</em>.</p>
</dd>
<dt class="hdlist1"><em>&lt;rev&gt;:&lt;path&gt;</em>, e.g. <em>HEAD:README</em>, <em>:README</em>, <em>master:./README</em></dt>
<dd>
<p>A suffix <em>:</em> followed by a path names the blob or tree
at the given path in the tree-ish object named by the part
before the colon.
<em>:path</em> (with an empty part before the colon)
is a special case of the syntax described