[Spacewalk-list] new client subscribe to channels via cli?

[jason at monsterjam.org]

[root at rwebmon ~]# rhnreg_ks --force --serverUrl=http://redhouse.mydomain.com/XMLRPC 
--activationkey=1-0f11d5ablablablablablabla
This system is not subscribed to any channels.
RHN channel support will be disabled.
[root at rwebmon ~]# 

ive searched but cant seem to find how to subscribe to channels via command line. Please hit me with a cluestick.. I know i can do it via 
the gui, but would prefer a cli.

thanks/regards,
Jason