 dir file</code> returns a file name that designates file
   <code class="code">file</code> in directory <code class="code">dir</code>.<br>
</div>

<pre><span id="VALis_relative"><span class="keyword">val</span> is_relative</span> : <code class="type">string -&gt; bool</code></pre><div class="info ">
Return <code class="code"><span class="keyword">true</span></code> if the file name is relative to the current
   directory, <code class="code"><span class="keyword">false</span></code> if it is absolute (i.e. 