i am not able to find smon process
[oracle@testmachine ~]$ ps -ef | grep smon
oracle 22226 20589 0 17:17 pts/1 00:00:00 grep smon
is it oracle database instance running on your host?
are you able to see ps -ef|grep ora command out put?
ps -ef | grep smon this specfic command only not working?
please post oracle version and os version...