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by arexxbifs 2148 days ago
What we'd recognize as vi was first called "ex" - and since it was more featureful than ed, it was also a larger program [0]

The essence of BSD is also still in use, but I'm willing to bet that once this essence - much like that of ex - has been expanded into something we'd consider a capable system today, it's also going to require a lot more resources.

[0] https://minnie.tuhs.org/cgi-bin/utree.pl?file=2BSD/src/ex/RE...