n">-&gt;</span>&nbsp;unit&nbsp;=&nbsp;<span class="string">"caml_sys_chdir"</span><br>
&nbsp;&nbsp;<span class="keyword">external</span>&nbsp;getcwd&nbsp;:&nbsp;unit&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;string&nbsp;=&nbsp;<span class="string">"caml_sys_getcwd"</span><br>
&nbsp;&nbsp;<span class="keyword">external</span>&nbsp;readdir&nbsp;:&nbsp;string&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;string&nbsp;array&nbsp;=&nbsp;<span class="string">"caml_sys_read_directory"</span><br>
&nbsp;&nb