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