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awk '(NR>1) && (($2>=50) || ( ($3-$2)>20))' datafile

The (NR>1) && is just to prevent it from printing that first line with all the titles, if your data doesn't really have that lop it off.

Hi.

I suppose there are other ways, but here's one:


$ awk 'NF { X=1 } X' input.txt
test

Test
$>