Ban IP:Port from .txt file using crontab

#!/bin/sh
# By Anthony Smith - InceptionHosting.com - 2013
# This script bans IPs with specific Ports that are added to a .txt file
# This script should be called every minute as a cronjob/from crontab

# build list from user input /var/www/ban.ban-list.txt should be the one your game admis update
# change the path and file name if required

cat /var/www/ipban/ban-list.txt | awk '{print $1}' > /ban/banip.txt

# loop through list and add to iptables
# this will also add each ip you block to /ban/perm-ban.txt
# you can run 'cp /ban/perm-ban.txt /ban/banip.txt' after a reboot and run this script
# this will re ban any previously banned ip's if you are not saving your iptables config

while read blist
do
/sbin/iptables -A INPUT -s $blist -p udp -m udp --dport 28960:28965 -j DROP && sleep 2
echo $blist has been added to your iptables
echo $blist >> /ban/perm-ban.txt
done < /ban/banip.txt

# tidy up files
# on the next few lines update the path after touch to be the same as the first line
# example /var/www/ban/ban-list.txt

rm /ban/banip.txt
rm /var/www/ipban/ban-list.txt
touch /var/www/ipban/ban-list.txt
chmod 777 /var/www/ipban/ban-list.txt