Splitting the list of IP addresses into files by country codes

ipbycountry.sh

#!/bin/sh
PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/games:/usr/local/sbin:/usr/local/bin:/root/bin

if [ $# = 0 ]; then
  echo
  echo Usage example:
  echo "sh ipbycountry.sh IPs.list"
  echo
  exit 1
fi

iplist=$1

for IP in `cat $iplist`
do
  country=`geoiplookup "$IP" | head -1 | awk '{print $4}' | cut -d , -f1`
  if [ "x$country" = 'x' ]; then
    # If the IP address does not belong to any country (not in the database)
    country="XX"
  fi
  echo $IP >> $country.ips
done