As an undergraduate we had to use ed for all our editing needs after we moved away from punch cards because vi was considered too resource-hungry. Four years of

As an undergraduate we had to use ed for all our editing needs after we moved away from punch cards because vi was considered too resource-hungry. Four years of ed on an IBM 3101, and to this day 4 decades later I still prefer a green-on-black CLI interface and Cherry MX Green keys but use vim in big windows. I can still get by using ed when I have to though.