Bash script that checks if current ip has changed. If it did change, send new ip on email address

checkip.sh

#!/bin/sh
cd ~/scripts
LAST_IP_FILENAME="./last_known_ip"
MY_EMAIL_ADDRESS="[email protected]"
LAST_IP=""
#CURRENT_IP=`/sbin/ifconfig | awk '/enp3s0/{getline; split($2, result, ":"); print result[2]; }'`
CURRENT_IP=`/sbin/ifconfig | awk '/enp3s0/{getline; print $2; }'`

if [ -f "$LAST_IP_FILENAME" ]; then
	LAST_IP=`cat $LAST_IP_FILENAME`;
else
	touch "$LAST_IP_FILENAME"
fi

if [ "$LAST_IP" != "$CURRENT_IP" ]; then
	echo "Ip changed, new ip: $CURRENT_IP"
	echo "$CURRENT_IP" > "$LAST_IP_FILENAME"
	echo "IP changed, new ip is [$CURRENT_IP]" | mail -s "IP changed" $MY_EMAIL_ADDRESS
fi