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After much experimenting with the -f feature I finally figured out how to trick it. It needs %.0f to make it print integers, followed by whatever string you want.

seq -f '%.0f -' 1 20 I suspect...

the seq command doesn't do anything but generate sequences. How about this?

printf "%d -\n" `seq 1 20`

which amounts to printf "%d -\n" 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20