Give name for every nth line

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http://www.unix.com – Hi all, Greetings. I am facing some troubles and hope that the professionals here could help me. I am handling a large dataset, and part of it is like below: Code: 1        ab139        0        752566        G        A 1        ab151        0        846808        T        C 1        ab142        0        854250  &nb (HowTos)