UNIX pipes as IO monads
Monadic i/o and UNIX shell programming This is an essay inspired by Philip Wadler's paper "How to Declare an Imperative" [Wadler97]. We will show uncanny similarities between monadic i/o in Haskell, and UNIX filter compositions based on pipes and redirections. UNIX pipes (treated semantically as writing to temporary files) are quite similar to monads. Furthermore, at the level of UNIX programming,
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