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Thanks for the suggestions. Re-framing my question.

I have a difficulty in writing shell script for performing the tasks.
I have a file group.dat containing below values.
Let suppose 1st colum...

Thanks for coming back.
This code compares the values in same rows. I need to compare the values from different rows,For eg, need to compare 2nd row of column A with 1st row of column C , then...

Hi I have a difficulty in writing shell script for performing the tasks.

A B C D
12 230 16 259
18 260 23 283
21 291 36 298
41 309 49 420
52 425 57 450
61 456 70 473
72 475...