It seems you have a handle on what you want to do and where to get the information. What do you need help with?

Hint: scripting is only putting in a executable file what you could have done from the command line. Adding loops and conditions is to allow for your manually doing it in your head (When you see a different IP address on a specific user name, you realize you need to check it out ). So just put in the script the steps you are doing manually.