ROTFLMAO. You do realize, that more than half the people reading this have no idea whatsoever, what in the hell is a "GUI?"
For those people, GUI = Graphical User Interface, i.e., if you're using Windows and or a Mac, your using a "GUI."
Well, you never know.
Suppose the customs agent typed in:
cd /
find . “*.jpg” | grep girl > /tmp/dirtypictures.txt
“Sir, did you used to be a Unix SA before you joined the US Customs?”