iptables-sefety.sh

#!/bin/bash

# more safety iptables-rule checker script

# Example
# iptables -A INPUT -p tcp --dport 22 -j REJECT

iptables-save > /tmp/iptables.up.rules.bak
( sleep 3; iptables-restore < /tmp/iptables.up.rules.bak; echo "Discard changes") &
iptables-restore < /etc/iptables.up.rules

echo "Press [y] key"
read line
case $line in
    [yY]*)
        kill $!
        ;;
    *)
        ;;
esac