Certainly factor/retroforth, Forth is too low level to be useful, but with support for quotations and streams, factor/(retro?) might be good, dealing with serie

Certainly factor/retroforth, Forth is too low level to be useful, but with support for quotations and streams, factor/(retro?) might be good, dealing with series a la rebol is also a good idea. Unfortunately all of those languages are kind of dead. The interesting thing is that pipes behave in an rpn like fashion, but standard behavior is prefix based, So a rebol like language should be the normal operation, and then it changes to rpn when you pipe, the only languages I see implementing this is rye, which is highly experimental. Powershell is also a really good option, at least for what OP wants, I like terseness. I can read bash code fine enough, until someone starts golfing, but that's true of all languages. python also has xonsh.