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Subject: [TUHS] Re: A few comments on porting the Bourne shell
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Chet Ramey on 30.12.2022 20:51:
> Arnold Robbins built on that work and ported the v8-v10 shells to modern
> Linux versions. (I am sorry, I do not have a link right now.)

And btw, 8th ed (http://man.cat-v.org/unix_8th/1/sh) even added a simple 
history mechanism with the "=(1)" command 
(https://www.in-ulm.de/~mascheck/bourne/v8/=.html).

Sven