Using OpcCmd Utility as OPC UA Client
From OPC Labs Knowledge Base
For general information about the OpcCmd tool, see Category:OpcCmd.
Commands, Arguments and Options
Command: uaClient subscribe
OpcCmd -i uaClient subscribe opc.tcp://opcua.demo-this.com:51210/UA/SampleServer nsu=http://test.org/UA/Data/;i=10849