Unix tools/yes
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yes
A simple utility to repeatedly print "y" to standard output.
Here are some various ways this small program can be written:
main = let y = putStrLn "y" >> y in y
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main = putStrLn $ concat $ repeat "y\n"
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main = let y = 'y' : '\n' : y in putStrLn y
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main = putStrLn "y" >> main
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main = putStrLn $ cycle "y\n"
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