Add/remove instance using srvctl - oracle database script

-- SYNTAX FOR REMOVING INSTANCE ---srvctl remove instance -d DB_UNIQUE_NAME -i INSTANCE_NAME e.g srvctl remove instance -d PRODB - I PRODB1  -- SYNTAX FOR ADDING INSTANCE  --- srvctl add instance –d db_unique_name –i inst_name -n node_name e.g srvctl add instance -d PRODB - i PRODB1 -n rachost1