Example: Using OPatch to patch on RAC

$ unzip p6602742_10203_Linux-x86-64.zip
$ cd 6602742
[6602742]$ ssh-agent $SHELL
[6602742]$ ssh-add
...
[6602742]$ opatch apply
Invoking OPatch 10.2.0.3.0

Oracle interim Patch Installer version 10.2.0.3.0
Copyright (c) 2005, Oracle Corporation. All rights reserved..

Oracle Home : /oracle/...
Central Inventory : /oracle/oraInventory
from : /etc/oraInst.loc
OPatch version : 10.2.0.3.0
OUI version : 10.2.0.3.0
OUI location : /oracle/.../oui
Log file location : /oracle/.../cfgtoollogs/opatch/opatch2008-02-26_11-20-30AM.log

ApplySession applying interim patch '6602742' to OH '/oracle/...'

Subset patches: 6602742
.
.
.
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when Patch completed. You can check Inventory


[$ opatch lsinventory
Invoking OPatch 10.2.0.3.0

Oracle interim Patch Installer version 10.2.0.3.0
Copyright (c) 2005, Oracle Corporation. All rights reserved..

Oracle Home : /oracle/...
Central Inventory : /oracle/oraInventory
from : /etc/oraInst.loc
OPatch version : 10.2.0.3.0
OUI version : 10.2.0.3.0
OUI location : /oracle/.../oui
Log file location : /oracle/.../cfgtoollogs/opatch/opatch2008-02-26_11-40-28AM.log

Lsinventory Output file location : /oracle/.../cfgtoollogs/opatch/lsinv/lsinventory2008-02-26_11-40-28AM.txt

--------------------------------------------------------------------------------
Installed Top-level Products (2):

Oracle Database 10g 10.2.0.1.0
Oracle Database 10g Release 2 Patch Set 2 10.2.0.3.0
There are 2 products installed in this Oracle Home.

Interim patches (4) :

Patch 6602742 : applied on Tue Feb 26 11:30:28 ICT 2008
Created on 7 Jan 2008, 05:38:40 hrs US/Pacific Bugs fixed: 6602742, 5863277, 6334554, 4367986, 5177766, 5254759, 5955454, 6085625 6039513, 5648872, 6417744, 6452485


Rac system comprising of multiple nodes
Local node = db01
Remote node = db02

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OPatch succeeded.