s="type-var">'stdin</span>, <span class="type-var">'stdout</span>, <a href="#type-channel">channel</a>)</span> <a href="../Core/Cmd/index.html#type-t">Cmd.t</a></span></span></code></div><div class="spec-doc"><p>redirect stderr to an out_channel.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-file_in"><a href="#val-file_in" class="anchor"></a><code><span><span class="keyword">val</span> file_in : 
  <span>string <span class="arrow">&#45;&gt;</span></span>
  <span><span><span>