I'm not sure what you're asking with your second question "on unix –what is the step by step procedure to check the latest version of JRE".
Is that question related to the Teradata JDBC Driver?
Generally speaking, you can see what your Java version is by running the java command with the -version command line option.
The Teradata JDBC Driver Supported Platforms matrix is available here on Developer Exchange as part of the Teradata JDBC Driver Reference.
http://developer.teradata.com/doc/connectivity/jdbc/reference/current/platformMatrix.html
I'm not sure what you're asking with your second question "on unix –what is the step by step procedure to check the latest version of JRE".
Is that question related to the Teradata JDBC Driver?
Generally speaking, you can see what your Java version is by running the java command with the -version command line option.
For example:
java -version