^ what he said. It's especially important if you're looking to navigate to a directory, such as....
cd user/desktop/TRUSLIDE/SDK/tools
if my folder on the desktop is truslide in all caps, it should be entered as such.
When you get any more specific, always use things EXACTLY as they are.
Calam10... your best bet is to hit up google. Ubuntu is a beautiful environment but sadly it is not frequently used. You could try an Ubuntu forum.