Creating an IP Lookup with one line

Make a file called public-ip.sh 

 sudo nano public-ip.sh 

 Copy this: 

 #!/bin/bash

# dig command to lookup what the public ip address is

dig +short myip.opendns.com @resolver1.opendns.com 

 Make it executable: 

 sudo chmod +x public-ip.sh 

 Run the file and it will output your current public IP: 

 ./public-ip.sh