1. To find the JAVA version on your UNIX or Linux operating system, execute below command and you will the see the result something like,
# java -version Java(TM) 2 Runtime Environment, Standard Edition (build 1.6)
2. But, if the result return something like this, it mean that either it is not installed or you did not setup the path properly.
# java -version -bash: java: comand not found
