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How to remove duplicate ID's?

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linux-howto

http://www.unix.com – HI I have file contains 1000'f of duplicate id's with (upper and lower first character) as below i/p: a411532A411532a508661A508661c411532C411532 Requirement: But i need to ignore lowercase id's and need only below id's o/p: A411532 A508661 C411532 (HowTos)