Hmm. Five months after #nushell's introduction ( http://www.jonathanturner.org/2019/08/introducing-nushell.html ) and https://book.nushell.sh/ seems to be down.
I'll probably try it out, but not yet. http://www.jonathanturner.org/2019/08/introducing-nushell.html https://book.nushell.sh/en https://github.com/nushell/nushell #Nushell