I was today years old when I learned that GNU sort has a -h option. Which doesn't mean "help" but means "use human-friendly units."
Except I sort of derived its existence from first principles. Someone wanted a way to find disk hogs (they were on a Linux box), but also wanted SI units, and I said to myself, "self, doesn't that sound like exactly the sort of baroque and vaguely nauseating option that GNU would add to sort?" Turns out it is.
Well, I mean, the MacOS man page just says that -h is an extension to POSIX (yes, it's there on MacOS too), but I will eat a small hat of mine if it didn't come to sort via GNU.
Adam