Bash script for updating Namecheap DDNS IP address

Update Namecheap DDNS

#!/bin/sh

# Variables
LAST_IP_FILE=/tmp/lastip.txt
LOGFILE=/var/log/namecheap.log
TIME="`date +%Y-%m-%d:%H:%M`"
HOST=@
DOMAIN=example.com
PASSWORD=0123456789abcdef0123456789abcdef
echo "TIME: $TIME"

# Grab last IP
LAST_IP=`cat $LAST_IP_FILE`
echo "LAST IP: $LAST_IP"

# Get current IP
IP="`wget --no-check-certificate -qO - https://dynamicdns.park-your-domain.com/getip`"
echo "CURRENT IP: $IP"

# Check if IP has changed
if [ "$IP" = "$LAST_IP" ]; then
    echo "IP has not changed"
    echo "Exiting"
    exit 1
fi

# Update Namecheap DDNS
URL="wget --no-check-certificate -qO - https://dynamicdns.park-your-domain.com/update?host=$HOST&domain=$DOMAIN&password=$PASSWORD&ip=$IP"
RESPONSE=$($URL)
echo "Response:"
echo $RESPONSE

# Save the current IP as the last IP
echo "$IP" >> $LAST_IP_FILE

# Log the time and IP
echo "$TIME - $IP" >> $LOGFILE