I am happy to see some effort going into the shell domain. I hope that the authors of shok will look into some other non-POSIX shells that are almost forgotten now, but in my eyes would really deserve to live on: ES [1] and [2] and SCSH [3] and [4].

[1] http://stuff.mit.edu/afs/sipb/user/yandros/doc/es-usenix-win...

[2] https://github.com/wryun/es-shell

[3] http://scsh.net/

[4] https://github.com/scheme/scsh/network