> Looking at the source code, it is impressive that this re-implementation is essentially complete! Look at this: https://github.com/uutils/coreutils/tree/main/src/uu It's only missing some obscure and fringe things.
It's not just a matter of having all the individual tools, it's a matter of having them be functionally complete and behaving either the same as GNU or POSIX - note the graph part way down the readme that talks about having only slightly better than half of the tests passing. And the tests probably aren't truly comprehensive, especially for things that people didn't realize were implementation specific or non-guaranteed behaviors. It's good to see them making progress, I just want to someone temper the idea that they're close to done.