v></div><div class="odoc-spec"><div class="spec value anchored" id="val-cmd"><a href="#val-cmd" class="anchor"></a><code><span><span class="keyword">val</span> cmd : 
  <span><span class="optlabel">?prog</span>:string <span class="arrow">&#45;&gt;</span></span>
  <span><span class="optlabel">?env</span>:<span>string list</span> <span class="arrow">&#45;&gt;</span></span>
  <span><span class="optlabel">?block</span>:bool <span class="arrow">&#45;&gt;</span></span>
  <span><span>string list</span> <span class