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There's always a REPL close by for users that are technical enough.

I used `bc` for years and years

On the Commodore 64 the OS was a REPL and ? was shorthand for PRINT, therefore you could type `? 2+2` and you would get the result printed.

This felt so intuitive to me that ever since, I’ve ensured my machines had ? do calculations in the shell (by aliasing it to whatever could do math).