cat "$tool"/etc/nsd3/nsd.conf
for zone in $(find "$tool"/etc/nsd3/zone.d \
-mindepth 1 -maxdepth 1 -type f \
- -false ${@:+$(printf -- '-or -name %s.conf\n' "$@")} \
-printf '%f\n')
do zone=${zone%.conf}
if test -e "$tool"/etc/nsd3/zone.d/"$zone".zone.m4