Deinstall (11.2 onwards)

opatch lsinventory -all | awk '/List of Oracle Homes:/,/Installed Top-level Products/'

export OHOME=/u01/app/oracle/product/12102 # Set as appropriate based on output from above

ls ${OHOME}                                # If the directory does not exist then Detach rather than Deinstall

export DINST=${OHOME}/deinstall

cd ${DINST}

./deinstall -checkonly -o ${DINST}/response

./deinstall -silent -paramfile ${DINST}/response/$(ls -rt ${DINST}/response | tail -1)

opatch lsinventory -all | awk '/List of Oracle Homes:/,/Installed Top-level Products/' # Deinstalled Home should be gone

Detach

Set ORACLE_HOME to your current environment (tested with 12.2) irrespective of the version you wish to detach...

opatch lsinventory -all | awk '/List of Oracle Homes:/,/Installed Top-level Products/'

export OHOME=/u01/app/oracle/product/10.2.0 # Set as appropriate based on output from opatch

export ONAME=ORAHome                        # Set as appropriate based on output from opatch

ls ${OHOME}                                 # If the directory exists then Deinstall rather than Detach

${ORACLE_HOME}/oui/bin/runInstaller -silent -detachHome ORACLE_HOME="${OHOME}" ORACLE_HOME_NAME="${ONAME}"

opatch lsinventory -all | awk '/List of Oracle Homes:/,/Installed Top-level Products/'

Backout

If you accidentally Detach an Oracle Home directory that exists, you can backout using...

${ORACLE_HOME}/oui/bin/runInstaller -silent -ignoreSysPrereqs -attachHome ORACLE_HOME="${OHOME}" ORACLE_HOME_NAME="${ONAME}" CLUSTER_NODES="{}" 

Deinstall (11.1 and prior)

Set Oracle environment to match the ORACLE_HOME to be removed.

opatch lsinventory -all | awk '/List of Oracle Homes:/,/Installed Top-level Products/'

export OHOME=/u01/app/oracle/product/10.2.0 # Set as appropriate based on output from opatch

opatch lsinventory | grep "^Oracle Database" | head -1

export OVERS=$(opatch lsinventory | grep "^Oracle Database" | head -1 | awk '{ print $4 }')

cd $ORACLE_HOME/oui/bin

./runInstaller -silent -debug -deinstall DEINSTALL_LIST='{"oracle.server","${OVERS}"}' REMOVE_HOMES={"${OHOME}"}

Set Oracle environment to the current ORACLE_HOME

opatch lsinventory -all | awk '/List of Oracle Homes:/,/Installed Top-level Products/'

Remember to Delete/Update any .profile files or scripts that refer to the deinstalled ORACLE_HOME

Bibliography