1#!/bin/bash 2 3set -x 4 5$XT_MULTI iptables -t filter -N c1 || exit 0 6$XT_MULTI iptables -t filter -N c1 || exit 1 7 8$XT_MULTI ip6tables -t filter -N c1 || exit 0 9$XT_MULTI ip6tables -t filter -N c1 || exit 1 10 11echo "E: Duplicate chains" >&2 12exit 0 13