There is no better day
to spew some variables:
Iptables='/usr/sbin/iptables'
path to iptables command.
clear my mind...
to avoid some error messages verify
if the user running this script has superuser privileges
... and if not, do not run the script at all.
if [ $(id -u) != "0" ]; then
echo 'Go away! You have been marked as INSECURE!'
exit 1
fi