Wouldn't getContents from the prelude work instead of IO.getContents? This shortens a lot because now you can use ghc -e instead of runhaskell, eg. 

#!/bin/sh
ghc -e 'getContents>>=print.maximum.map length.lines'

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We also use some other functions of the Prelude for brevity. Note that the code can't be in the same argument as -e.

In reply to Re^2: Golf: Length of longest line in a file by ambrus
in thread Golf: Length of longest line in a file by toolic

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