r"><a href="#exception-Subprocess_error" class="anchor"></a><code><span><span class="keyword">exception</span> </span><span><span class="exception">Subprocess_error</span> <span class="keyword">of</span> string</span></code></div><div class="spec-doc"><p>When the library raises, it always raises a Subprocess_error of string.</p></div></div><div class="odoc-spec"><div class="spec module anchored" id="module-Cmd"><a href="#module-Cmd" class="anchor"></a><code><span><span class="keyword">module</span> Cmd</spa