/dd>
<dt class="hdlist1"><a id="def_head_ref"></a>head ref</dt>
<dd>
<p>A synonym for <a href="#def_head">head</a>.</p>
</dd>
<dt class="hdlist1"><a id="def_hook"></a>hook</dt>
<dd>
<p>During the normal execution of several Git commands, call-outs are made
to optional scripts that allow a developer to add functionality or
checking. Typically, the hooks allow for a command to be pre-verified
and potentially aborted, and allow for a post-notification after the
operation is done. The hook scripts are found in 