Download
<a href="<% $url_base %>/jpctb.tar.gz"><% $url_base %>/jpctb.tar.gz</a>
and unpack it. You run it from the command line. Change
-to the directory where you unpacked the tarball above, and then run
+(<code>cd</code>) to the top level <code>jpctb</code> directory
+which was created when you unpacked the tarball, and then run
<pre>
./jpctb /path/to/yohoho/yohoho
</pre>