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Deleting all rows where the first column equals the second column

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http://www.unix.com – Hi, I have a tab delimited text file where the first two columns equal numbers. I want to delete all rows where the value in the first column equals the second column. How do I go about doing that? Thanks! Input: Code: 1 1 ABC DEF 2 2 IJK LMN 1 2 ZYX OPW Output: Code: 1 2 ZYX OPW (HowTos)