[Haskell-cafe] How to cut a file effciently?

[Magicloud Magiclouds]

Hi,
  Let us say I have a text file of a million lines, and I want to cut
it into smaller (10K lines) ones.
  How to do this? I have tried a few ways, none I think is lazy (I
mean not reading the file all at the start).
-- 
竹密岂妨流水过
山高哪阻野云飞
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