There's one case where the command prompt is terribly useful. You say you have a
problem, and I can tell you how to fix it. I have two methods: I can say, "start
this program, select this tab, click here, click there, then click this other
place." In my experience, half the time, the user can't find the tab I'm talking
about.

The other option is, "paste this command into a terminal and run it." There's no
chance you can get it wrong, unless you don't know how to copy/paste. And it's
about 10 times as fast.