define service{
        hostgroup_name                  jonathan
        service_description             EXIM
        max_check_attempts              4
        event_handler                   rr-exim
        }
define command{
        command_name    rr-exim
        command_line    /etc/nagios/commands/remote-restart-exim  $SERVICESTATE$ $SERVICESTATETYPE$ $SERVICEATTEMPT$
        }
/usr/nagios/bin/nagios -v /etc/nagios.cfg

Nagios 2.10
Copyright (c) 1999-2007 Ethan Galstad (http://www.nagios.org)
Last Modified: 10-21-2007
License: GPL

Reading configuration data...

Error: Service description, host name, or check command is NULL
Error: Could not register service (config file '/etc/nagios/config.cfg', starting on line 35)

***> One or more problems was encountered while processing the config files...