title: Change Tomcat port on-the-fly
body: <p>I'd like to store the Tomcat v5.5 port in an environment variable and have Tomcat listen on that port.   So far the only way I can see to change the port is by amending $CATALINA_HOME/conf/server.xml.  Is there a way to set the port value by supplying an external value when starting Tomcat?  I'm running Tomcat on Solaris.</p>