Better regex to avoid a possibly commented #port=0: grep -qr "^[[:space:]]*port=0" /etc/dnsmasq.d/ /etc/dnsmasq.conf && return
Better regex to avoid a possibly commented #port=0: ]]*port= 0" /etc/dnsmasq.d/ /etc/dnsmasq.conf && return
grep -qr "^[[:space: