[TUHS] Other Bell Labs shells from the 80s?

[Noel Hunt via TUHS]

On Tue, 3 Mar 2026 at 09:33, George Michaelson via TUHS <tuhs at tuhs.org>
wrote:

> That "output is valid input" thing totally was what I wanted, I played with
> making PS1 and PS2 elements which did not prevent cut-paste making valid
> commands and it never quite worked for me. Not the same, but related.
>

That's why 'rc' and 'es' use ';' and ';;', respectively, as prompts.