Iptables: Ler arquivo

#!/bin/bash

IPTABLES="/usr/sbin/iptables"

for i in 'cat lista.txt'
do

$IPTABLES -A FORWARD -s $i -p tcp --dport 1863 -j ACCEPT
$IPTABLES -A FORWARD -d $i -p tcp --sport 1863 -j ACCEPT

done

$IPTABLES -A FORWARD -p tcp --dport 1863 -j DROP
$IPTABLES -A FORWARD -p tcp --sport 1863 -j DROP
$IPTABLES -A FORWARD -d loginnet.passport.com -j DROP

FONTE: http://under-linux.org/f96/iptables-ler-arquivo-texto-86161/