sed -i -e '/^\.Dt/{s/Dt/99/;y/ABCDEFGHIJKLMNOPQRSTUVWXYZ/abcdefghijklmnopqrstuvwxyz/;s/99/Dt/;}' *.[1-8]
for s in 1 3 5 7 8; do echo *.$s; done | xargs groff -t -mdoc -Tpdf >| mandoc-groffed.pdf