#!/bin/bash awk -F'[\t ]+' '{ if (!match($0, /^[\t ]*(#|$)/)) { if (NF>=2 && length($2)) { host=$2 } else { host=$1 } if (!match(host, /^(localhost|local|localhost.localdomain|ip6-localnet|ip6-localhost$)$/)) { print "127.0.0.1 " host } } }' adlists/* | sort > block.list