Werbach gives the example of several Disneyland hotels in Anaheim, California, which used large digital leaderboards to display how efficiently laundry workers were working compared to one another.

Then one weekend, your Web site stops working: it can't display prices in other currencies.

You saw how to change directories using the absolute path and the relative path, and you learned how to display the working directory you are in and toggle back and forth between two directories.