
It's likely that the files you're looking for are in some package called tomcat7-something. Searching inside a package and its dependencies is more complicated. The files you want to modify may be in dependencies of the main tomcat7 package. For example, to see the configuration files (which live under /etc): dpkg -L tomcat7 | grep /etc You may want to search in the output use the grep command.

You can list the contents of an installed package with the dpkg command, which is the low-level package manipulation command that the APT tools call internally: dpkg -L tomcat7
