how to stop db2 instance

#how to stop db2 instance

su - db2user db2 force applications all; db2 force applications all; db2 force applications all db2 deactivate db gbp db2stop force /opt/IBM/db2/V9.7/instance; ./db2iupdt db2user  (root user) /opt/IBM/db2/V9.7/instance; ./db2iupdt db2user  (root user) su - db2gbp db2start db2level