How can we fine and delete unused variables?

Hi , This is Kumar,
I have been working for some Upgrade project. My manager asked me the way to know unused variables which are already declared in the program . But i don't know any special way to find them.
Normally for Internal tables we are using CLEAR, REFRESH AND FREE.
So,
How can we delete unused variables which are already declared in program?
If anybody have any idea , kindly let me know.
Thanks & Regards,
P.N.Kumar.

Hello friend,
in SE24,SE38 and SE80 there is a menu called "Refactoring" which can enable you to delete unused variable defined in your source code automatically.
Of course it is not the only functionality of this poweful tool. Please read the article below:
http://www.sdn.sap.com/irj/scn/index?rid=/library/uuid/2054857b-1b4d-2c10-f7a5-d283a11f6789
I am sure you can benefit a lot from it not only know how to delete unused variable
Best Regards,
Jerry

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