+.nf
+# udev_root - where to place the device nodes in the filesystem
+udev_root="/udev/"
+
+# udev_db - The name and location of the udev database
+udev_db="/udev/.udev.tdb"
+
+# udev_rules - The location of the directory where to look for files
+ which names ending with .rules
+udev_rules="/etc/udev/"
+
+# udev_permissions - The name and location of the udev permission file
+udev_permissions="/etc/udev/udev.permissions"
+
+# udev_log - set to "yes" if you want logging, else "no"
+udev_log="yes"
+
+# default_mode - set the default mode for all nodes not
+# explicitely matching in the permissions file
+default_mode="0666"
+
+# default_owner - set the default owner for all nodes not
+# explicitely matching in the permissions file
+default_owner="root"
+
+# default_group - set the default group for all nodes not
+# explicitely matching in the permissions file
+default_group="root"
+.fi
+.P
+The rules for udev to use when naming devices may specified in
+.I /etc/udev/udev.rules
+or by the
+.I udev_rules
+value in the
+.I /etc/udev/udev.conf
+file.
+.P
+Every line in the rules file defines the mapping between device attributes
+and the device file name. One or more keys are specified to match a rule
+with the current device. If all keys are matching, the rule will be applied
+and the name is used for the device node.
+.br
+If no matching rule is found, the default kernel device name is used.
+.P
+Every rule consists of a list of comma separated fields:
+.sp
+.IR "key " ,[ "key " ,...] " name " [, " symlink" ]