My school assigned classes automatically, but you could dial into a serial terminal to try to change classes. Obviously all of the good classes filled up fast

My school assigned classes automatically, but you could dial into a serial terminal to try to change classes. Obviously all of the good classes filled up fast so I wrote an Expect script that polled each class I wanted every 15 minutes and signed up if there was room. I managed to get into every class I wanted in my Senior year despite one semester getting an initial class schedule that was blank save for one class due the school's RNG hating on me.