Update ip address bash script for UFW firewall

ufw_update.sh

#!/bin/bash
#allow a dyndns name

PATH="/usr/sbin:/usr/bin"
HOSTNAME=home.bronson.dev
LOGFILE=/tmp/updateip.log

Current_IP=$(host $HOSTNAME | cut -f4 -d' ')

touch $LOGFILE

if [ $LOGFILE = "" ] ; then
  ufw allow from $Current_IP
  echo $Current_IP > $LOGFILE
else

  Old_IP=$(cat $LOGFILE)

  # if [ "$Current_IP" = "$Old_IP" ] ; then
  #   echo IP address has not changed
  # else
    yes y |ufw delete $(ufw status numbered |(grep $Old_IP|awk -F"[][]" '{print $2}'))
    ufw allow from $Current_IP
    echo $Current_IP > $LOGFILE
    echo iptables have been updated
  #fi
fi