Overview
In order to my experience as the oracle user, I have updated .bashrc with the appropriate configuration settings.
Procedure
Ran the following command as the oracle user:
cat >>.bashrc <<DONE
# Set up environment for Oracle products
export ORACLE_BASE=/opt/app/oracle
# Set up environment for OMS
export ORACLE_HOME=${ORACLE_BASE}/middleware/oms
export PATH=${PATH}:${ORACLE_HOME}/bin
# Set up environment for OPMN
export ORACLE_INSTANCE=${ORACLE_BASE}/gc_inst/WebTierIH1
export PATH=${PATH}:${ORACLE_INSTANCE}/bin
DONE