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SYNOPSIS 的にコード片を書いてみる。runghcへ標準入力からぶっ込んで試せる感じの方がREPLよりしっくり来る派なので。

% runghc
import System.Process

main = do
  name <- readProcess "hostname" [] []
  let chompedName = filter (/= '\n') name
  putStrLn $ "Hello, " ++ chompedName ++ "!"

-- [実行結果]
-- Hello, mymac.local!
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