I have followed all directions, I have checked numerous times for simple or small errors, and found none. I just can't get a check for this exercise. After I typed ' alias pd="pwd" ' i saved using ctrl O (the letter), then pressed enter to save. I then used ctrl x to close nano, and entered 'clear' to clear the window. I think its a bug or a problem, but if there's a error or something to fix, someone please help.Thanks in advance.