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In Unix shell programming the pipe operator is an extremely powerful tool. With a small set of core utilities, a systems language (like C) and a scripting language (like Python) you can construct extremely compact and powerful shell scripts, that are automatically parallelized by the operating system. Obviously this is a very powerful programming paradigm, but I haven't seen pipes as first class abstractions in any language other than a shell script. The code needed to replicate the functionality of scripts using pipes seems to always be quite complex. So my question is why don't I see something similar to Unix pipes in modern high-level languages like C#, Java, etc.? Are there languages (other than shell scripts) which do support first class pipes? Isn't it a convenient and safe way to express concurrent algorithms? Just in case someone brings it up, I looked at the F# pipe-forward operator (forward pipe operator), and it looks more like a function application operator. It applies a function to data, rather than connecting two streams together, as far as I can tell, but I am open to corrections. Postscript : While doing some research on implementing coroutines, I realize that there are certain parallels. In a blog post Martin Wolf describes a similar problem to mine but in terms of coroutines instead of pipes.

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