[JdeBP]

You are the second person, after feisuzhu, to talk of tab completion.

But we were told a TTY not a shell.

Historically, there were all sorts of user interfaces that one could get over a terminal, not just Unix, GNU, and other shells. There were BBSes of many flavours, Prestel, and any number of bespoke menu-driven systems.

Giving people a shell inside a WWW browser has been done, and is even somewhat hackneyed at this point. (https://news.ycombinator.com/item?id=39829463 got 0 votes and 0 comments.) But some other kind of terminal interface makes for an interesting change.

The phrase "You are in a maze of twisty passages, all alike." seems apposite, at this point. (-: