Every shell is a REPL

Using your editor to drive a shell is a huge win because it: (a) flips the development bit in your brain, and (b) creates a shared history across all your machines.

Combine that with literate programming and you have a `duck-talking` history of every development or outage response tied to what you actually did.

Don’t you ever use a debugger? Don’t you consider that a REPL? It’s the same paradigm as a REPL with the same upsides and downsides.

Definitely. Debugging loves `duck-talking`.

Didn't mean to come across as REPLs consisted only items in the set of { programming , shells }.