  <span><span class="label">init</span>:<span class="type-var">'acc</span> <span class="arrow">&#45;&gt;</span></span>
  <span><span>(<span class="type-var">'acc</span>, string)</span> <span class="xref-unresolved">Stdlib</span>.result</span></span></code></div><div class="spec-doc"><p>Execute the command. Feed items from <code>lines</code> to the process stdin, which will be separated with a newline character by default. Use the optional <code>sep</code> parameter to change this to another string. While al