cd is correct. That does NOT mean that you can't redirect but you must setup Apache on the server AND enable mod_rewrite (see the tutorial linked in my signature for details on that).
THEN, as the tutorial continues, you need to be able to use the requested URI to develop the "real" (serveable) URI ... which does not appear possible from your example.
Finally, there are ways to do what you're asking and it's called a RewriteMap (which is only available to you if you have access to the server or virtual host configuration file). There is also a "poor man's RewriteMap" which uses a "handler file" (rather than a simple 404 script) to perform a lookup in a database with the map of old URI matched to the (new?) "real" URI. I fear that's beyond your ability at this point (from your question) but I've discussed this in many threads and in my tutorial ... and am available here if you have questions on this, too.