an also type shell commands just as in a shell:
</p>

<pre class="indented">
&lt;1&gt; pwd
<em class="gray">/home/bil/cl</em>
&lt;2&gt; cd ..
<em class="gray">/home/bil</em>
&lt;3&gt; date
<em class="gray">Wed 15-Apr-2015 17:32:24 PDT</em>
</pre>

<p>In most cases, these are handled through *unbound-variable-hook*, checked using "command -v", then passed
to the underlying shell via the system function.
</p>

<p>The prompt is set by the function (*repl* 'prompt).  It gets one argument,
the current line numbe