Oracle OPatch Utility

--opatch prereq commands

--Check if ORACLE_HOME is valid
$ opatch prereq CheckOracleHome

--Check if the oraInst.loc file
$ opatch prereq CheckOraInstLocation

--Check Central Inventory
$ opatch prereq CheckCentralInventoryLocation

--Check if OH is registered in Inventory
$ opatch prereq CheckCentralInventoryForOH

--Check Inventory for Read and Write Permission
$opatch prereq CheckCentralInventoryForRWSession

--Check if OH have JDK in it
$opatch prereq CheckJDK

--Check if oui in OH is compatible with OPatch utility
$opatch prereq CheckOUIVersionCompatible

--Check if libraries required are OK
$opatch prereq CheckRequiredLibs

--Check if another session is already locking OH
$opatch prereq CheckIfOHLockedForPatching

--Check System Space required
$opatch prereq CheckSystemSpace

--Check for conflits among patches already installed
$opatch prereq CheckConflictAmongPatchesWithDetail

--Check RAC nodes
$opatch prereq CheckRACNodeList

--Check if commands can be invoked on remote machines
$opatch prereq CheckRemoteCommandInvocable

--Check permissions for copy and remove files on remote machines
$opatch prereq CheckRemoteCopyAndRemove

--Check if Central Inventory has a CRS Home registered
$opatch prereq CheckForCRSHomeIfRAC

--opatch util commands

--Apply a set of patches
$opatch napply