Using the dpkg command:
dpkg -l = List all the packages on the system.
dpkg -L {package} = List all the files in a package.
Example:
jemurray@unixhosts:~$ dpkg -l | grep mailman
ii mailman 1:2.1.13-1ubuntu0.2 Powerful, web-based mailing list manager
jemurray@unixhosts:~$ dpkg -L mailman | grep sbin
/usr/sbin
/usr/sbin/list_lists
/usr/sbin/find_member
/usr/sbin/config_list
/usr/sbin/mmsitepass
/usr/sbin/newlist
/usr/sbin/rmlist
/usr/sbin/add_members
/usr/sbin/list_members
/usr/sbin/remove_members
/usr/sbin/clone_member
/usr/sbin/sync_members
/usr/sbin/check_db
/usr/sbin/check_perms
/usr/sbin/list_admins
/usr/sbin/withlist
/usr/sbin/mmarch