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I've seem a few attempts. This is just one example: https://github.com/u-root/u-root/tree/master/cmds/core

EDIT: You may also be interested in https://github.com/mvdan/sh

Why would Go be a better option than Rust here?

Go and Rust are optimized for different types of environments. There are a lot of situations when selecting Go over Rust would be a more pragmatic choice. I don't see how coreutils is one of these.

It seems like a reasonable opinion to me. Looking at the list of what's in coreutils, I don't see anything where performance would be a huge issue other than perhaps dd, so any performance edge Rust might provide seems moot. And I would guess that Golang would be less code and faster to write/implement.

I would feel differently if it were something else, like gawk, for example. Rust would be a better fit there.

Here you 'Go':

https://github.com/aisola/go-coreutils

Last commit was 2015, is it functional?