In z/OS UNIX, UUCP does not use the configuration files directly. Instead, it uses a special configuration file named config which is created when the administrator runs the uucc utility to compile the configuration files.

cd /var/uucp 
/usr/lib/uucp/uucc  

A compiled configuration file is created in the /var/uucp directory using the uucc command from /usr/lib/uucp. It contains all of the information specified in the individual configuration files.

Rule: The configuration file must be owned by the uucp user ID. If you run uucp from any other user ID, you must change the owner of the configuration file from that user ID to uucp.

Do not edit the configuration file directly. If you need to change your configuration, first edit the configuration files and then run uucc again.