#!/bin/bash
if [ ! -f .count ];then
  iptables -L -n|md5sum|awk '{print $1}' > ~/.count
  exit 1
else
  iptables -L -n|md5sum|awk '{print $1}' >~/1.txt
  difffile=`diff ~/.count ~/1.txt|wc -l`
  if [[ $difffile = 0 ]];then
     echo "file is ok!"
     sleep 1
     rm -f ~/1.txt
  else
     echo "file is no ok!"
     cat ~/1.txt >~/.count
     sleep 1
     rm -f ~/1.txt
fi
fi

chmod +x /root/check_iptables.sh
*/3 * * * * /bin/sh /root/check_iptables.sh