there's a basic linux utility or hack that allows you to type on the keyboard, but instead of what you type, each keystroke simply prints the next character fro

there's a basic linux utility or hack that allows you to type on the keyboard, but instead of what you type, each keystroke simply prints the next character from a predetermined string. the idea is you can mash up keys like in films and have text appear af if you were typing properly. can anyone remember what this is? I've been racking my brain with no success