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Sorting problem

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linux-howto

http://www.unix.com – I have data like this in file number usage (heading is assumed for understanding) ====== ====== 2162056R 0000028182N 3013588R 0000003636N 3013588R 0000000000N 3013588R 0000000000N Now I have to sort using second column(usage) and i should get first column against it post sorting please provide input (HowTos)