open ports in iptables bash

openports.sh

#!/bin/bash

# @author Mike Mackenzie (veb)
# @version 1.0

clear
echo ''
echo ''
if [ -z "$@" ]
then
    echo ''
    echo '#'
    echo '# This script can open up one or multiple ports and is saved to iptables'
    echo '# To run ./openports.sh <port1> <port2> <port3> ...'
    echo '#'
    echo ''
    read -p 'Press enter to exit'
    exit 0
fi

for var in "$@"
do
    echo "* Adding the port $var"
    iptables -A INPUT -p tcp --dport $var -m state --state NEW,ESTABLISHED -j ACCEPT
    iptables -A OUTPUT -p tcp --sport $var -m state --state ESTABLISHED -j ACCEPT
done

iptables -L -v -n | more
echo ''
echo '* Check the ruleset before applying'
echo ''
read -p "Press enter or CTRL+C to abort"

echo ''
echo ''
#iptables-save -c >.iptables_backup
invoke-rc.d iptables-persistent save -c >.iptables_backup
read -p "Ports added. Press enter to quit."
exit 0