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Postscript is so unpopular to use as a programming language that github doesn't even have it in their languages. I'm not even sure if you're just trolling or serious?

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I can second the use of postscript. A while back, I took it as a challenge to learn it, and ended up making some fairly extensive programs. I've actually found myself wishing there was a popular general-purpose scripting language that closely resembled postscript (stack-based, first class functions, first class environments).

You can download the books for it for free (the "blue book" is the tutorial). I highly recommend it, along with the "red book" which is also useful for adding to your general programming language theory.

You're aware of:

http://factorcode.org/ ?

(Popular would be a stretch, I guess)

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