On Thu, Mar 9, 2023 at 6:24 PM Tormod Volden wrote: > If you want every other line, use -s 2 of course. I see now that you And if you will need to preprocess instead, as Thore mentioned, awk is hard to beat: awk 'NR%2{print}' /tmp/32Mi.data > /tmp/Miodds.data awk '!(NR%2){print}' /tmp/32Mi.data > /tmp/Mieven.data Tormod