How to check IP address from command line | Internal and External

Check your Internal IP address 
 To check you current machines addres: "ip add" or "ip addr" or; 
 ip address 
 Check your external IP address 
 First make sure that the curl command is installed. If not, do this 
 sudo apt install curl 
 By using curl, check the external address by doing this; 
 curl -w "\n" -s https://api.ipify.org 
 That should give an output of your external IP address.