1. From registry.xml in MW_HOME View the registry.xml file.
<component name=”WebLogic Server” version=”10.3.6.0” InstallDir=”/home/weblogic/bea/weblogic/wlserver_10.3″>
2.From Weblogic.jar file.Change the directory to MW_HOME/wlserver_XX.X/server/lib and run below command
[weblogic@localhost lib]$ java -cp weblogic.jar weblogic.version
WebLogic Server 10.3.6.0 Tue Nov 15 08:52:36 PST 2011 1441050
Use ‘weblogic.version -verbose’ to get subsystem information
Use ‘weblogic.utils.Versions’ to get version information for all modules
3.From weblogic Admin console