Opatch

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OPatch is the Oracle database's Interim (one-off) Patch Installer.

If OPatch is not installed into your Oracle Home ($ORACLE_HOME/OPatch), you may need to download it from Metalink and install it yourself.

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Listing installed patches

All patches that are installed with Oracle's OPatch Utility can be listed by invoking the opatch command with the lsinventory option. Here is an example: 

$ cd $ORACLE_HOME/OPatch

$ opatch lsinventory
Invoking OPatch 10.2.0.1.0

Oracle interim Patch Installer version 10.2.0.1.0
Copyright (c) 2005, Oracle Corporation.  All rights reserved..
...
Installed Top-level Products (1):

Oracle Database 10g                                           10.2.0.1.0
There are 1 products installed in this Oracle Home.

There are no Interim patches installed in this Oracle Home.

OPatch succeeded.
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