oracle@mutation#export PATH=$PATH:$ORACLE_HOME/OPatch/OPatch
oracle@mutation#./opatch lsinventory

Oracle Interim Patch Installer version 1.0.0.0.56
Copyright (c) 2006 Oracle Corporation. All Rights Reserved..

We recommend you refer to the OPatch documentation under
OPatch/docs for usage reference. We also recommend using
the latest OPatch version. For the latest OPatch version
and other support related issues, please refer to document
293369.1 which is viewable from metalink.oracle.com

Oracle Home           : /u01/app/oracle/product/9.2.0
Oracle Home Inventory : /u01/app/oracle/product/9.2.0/inventory
Central Inventory     : /u01/app/oracle/oraInventory
   from               : /var/opt/oracle/oraInst.loc
OUI location          : /u01/app/oracle/product/9.2.0/oui
OUI shared library    : /u01/app/oracle/product/9.2.0/oui/lib/solaris/liboraInstaller.so
Java location         : /u01/app/oracle/product/9.2.0/jre/1.3.1/bin/java
Log file location     : /u01/app/oracle/product/9.2.0/.patch_storage/<patch ID>/*.log

Creating log file "/u01/app/oracle/product/9.2.0/.patch_storage/LsInventory__03-09-2007_11-08-28.log"

Result: 


  Installed Patch List:
  =====================
  1) Patch 5865568 applied on Wed Mar 07 16:23:51 EST 2007
      [ Base Bug(s): 5865568  ]
  2) Patch 5632264 applied on Wed Mar 07 14:57:45 EST 2007
      [ Base Bug(s): 5632264  ]