Web Log Analysis: Ep.5 – Searching Web Server Logs using Linux CLI

Well, the idea of the lab seems to be: Use "cut" to extract the IP address from the logs, and then count the unique values.
Another tool that you'll love or hate is awk. One of the most basic commands is

awk '{print $1}' 

Complete example:

echo "a b c" | awk '{print $2}'
b

It is much more versatile than cut, but not needed for this lab. Yet, I used it.