Speaking of Brian Kernighan, grep, and codas, there’s a (very) short afterward to Kernighan’s excellent video telling the story of the origin of greps’s name. At the end of that video (if you haven’t watched it, you definitely should) Kernighan describes a programming challenge he used to assign to his students. Many of the comments to the original video asked how well they did with it.
The afterward answers that question as well as what editor Kernighan is using now. Spoiler: it’s not, of course, ed but he does say that he’ll occasionally fire it up for a short job or if he wants to script an editing job.
The video is just a bit over 2 minutes and provides a nice ending to the original video. If you liked the grep video, you’ll doubtlessly enjoy this one too.