Try [code:1]ls -a ~[/code:1]
Directories and files beginning with a period are considered "hidden," that is to say they aren't normally displayed. Appending the '-a' switch to ls tells it to display ALL files, including hidden ones. The tilde (~) points to the user's home directory (generally /home/username).
You can enter hidden directories just like you would a normal directory:[code:1]cd ~/.kde[/code:1]