Originally Posted by unSpawn
'cat /etc/redhat-release' should return "Red Hat Enterprise Linux Server release 5.4 (Tikanga)" if updated to RHEL5U4 (rel. 02/09/2009). Also see 'yum update'.
Thanks for reply.
yum updates shows followings
[root@perf Downloads]# yum update
Loading "rhnplugin" plugin
Loading "installonlyn" plugin
This system is not registered with RHN.
RHN support will be disabled.
Setting up Update Process
Setting up repositories
No Repositories Available to Set Up
Reading repository metadata in from local files
No Packages marked for Update/Obsoletion
How to enable the RHN support and setup the repository.