At one of the Open Source Conferences (OSCON) I saw Damian Conway use a tool like this (I believe it was asciinema) to give one of the best command line based d

At one of the Open Source Conferences (OSCON) I saw Damian Conway use a tool like this (I believe it was asciinema) to give one of the best command line based demos I've ever seen. He was typing away like mad and not one typo! It was mesmerizing and the demo was totally awesome, of course it helps that he's a superb presenter to begin with. Later he revealed the "magic trick"!