The explosion of interest in GUIs since 1984 has had the unfortunate effect of obscuring the virtues of CLIs. The design of consumer software, in particular, has become heavily skewed towards GUIs. While this is a good choice for the novice and casual users that constitute most of the consumer market, it also exacts hidden costs on more expert users as they run up against the expressiveness limits of GUIs--costs which steadily increase as the users take on more demanding problems. Most of these costs derive from the fact that GUIs are simply not scriptable at all--every interaction with them has to be human-driven.