Is it possible to tell tomcat to use a particular port instead of the one specified in server.xml? Or a way to configure an environment variable as port number in server.xml? (which I can set in a batch file which starts tomcat)

Essentially, I want to launch different copies (versions) of a tomcat instance without having to manually change the server.xml in each of them and having to remember which one would launch at which port. I wish to specify the port number when I launch it so that there is no conflict in the multiple instances.

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