de-installation and re-inatation of Oracle 11.2g step-by step procedure on Linux plateform

Would you please help me in de-installation and re-inatation of Oracle 11.2g step-by step procedure on Linux plateform. It is very urgent for me. Thanks!

Its already answered in the previous post can you please check that.
Ideally we recommend you to install in on Virtual Machine so that it is very easy to scrap the environment if something goes wrong.
You can also download the pre-developer VM's from oracle site, it would be better than to install it from scratch.