They've done the Thompson Shell from Sixth Edition #Unix, and one can get the actual Bourne Shell through #Illumos (and its derivatives) nowadays. Here's one that the retrocomputerists have not tackled to my knowledge: Bill Joy's ashell from 1BSD. https://github.com/dspinellis/unix-history-repo/blob/BSD-1-Snapshot-Development/ashell/READ_ME It has hints of the later C shell about it. Look at how it does not allow redirecting only standard error, for example. (The manual is in the parallel man directory.) #BSD #UnixShells #sh #retrocomputing