Will ensure that the given CUPS classes are configured as declared. Please note that it is possible for some users to temporarily override these properties. If those changes conflict with this configuration, the configuration will take precedence and override them at boot and when a rebuild is applied. This configuration will not delete any classes that have been removed from the list. In order to list classes you can use lpstat -c. It will list any classes without members as having a member titled unknown. Print jobs to empty classes will silently fail. In order to remove a class, run lpadmin -x <class name>. Classes can still be added manually. For more on classes see https://www.cups.org/doc/admin.html#CLASSES, or lpadmin(8).