ref: c7abd2e7be5f3f9aff60f18121d47da13e5b279d dir: /src/execfs/rules/
# mount -q /srv/magic /usr/web/magic /man2html/([0-9])/([a-zA-Z0-9\.]+) troff -manhtml /sys/man/\1/\2 | troff2html -t '\2(\1)'