Solved How to access different user from root login

I have logged in as a oracle user in Solaris 10 system. I am trying to connect to sqlplus. But m getting TNS hostname not found error. When I tried to ping my own machine using hostname and IP address both, it is not pinging. However I can ping my own machine with root user. That's why I tried accessing oracle user from root login using 'login' command. but it is showing me utmpx entry missing error. Please suggest how to resolve this problem. Thaks in advance.

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