How to uninstall JRE from LINUX OS

hi,
I want to uninstall JRE old version from Linux OS.
I go to add/remove panel, but there is no option uninstall the JRE from LINUX OS.(i expect as Like windows)
In user manual from SUN for JRE also doesnot have how to uninstall JRE.
Any idea abt it.
Also, i want to put the JRE in CD,and from CD i want to install that JRE using linux shell script. is it possible.
If any one know, pls tell me.
thank you.

This is from the following link: http://www.java.com/en/download/help/5000011600.xml#jre
II. JRE Uninstallation
There are two ways to uninstall the JRE. Please use the method that you used when you installed the JRE. For example, if you used RPM to install the JRE, then use the RPM uninstallation method.
RPM uninstallation
Note: If you have RPM on your Linux box, you should first find out if Java is already installed using RPM. If Java is not installed using RPM, you should skip reading.
Open Terminal Window
Login as the super user
Try to find jre package by typing: rpm -qa
If RPM reports a package similar to jre-<version>-fcs, then Java is installed with RPM.
Note: Normally, you do not need to uninstall JRE with RPM, because RPM is able to uninstall the old JRE when installing a new version! You may skip reading, unless you want to remove JRE permanently.
To uninstall the JRE, type: rpm -e jre-<version>-fcs
Self-extracting file uninstallation
Find out if Java is installed in some folder. Common locations are /usr/java/jre_<version> or /opt/jre_nb/jre_<version>/bin/java/
When you have located the folder, you may delete folder.
Warning: You should be certain that Java is not already installed using RPM before removing the folder.
Type: rm -r name. For example: rm -r jre1.5.0

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