on my system, uname -a replied this
Linux systemname 2.6.9-22.ELsmp #1 SMP Mon Sep 19 18:32:14 EDT 2005 i686 i686 i386 ..
what i have done is changed ownership of a user on root directory
I am sorry
chown -R oracle
chmod -R 775 /oracle
and now i am not able to do su, neither i am able to connect through ssh client. I am really fret if i have blown up the system. Please can somebody help