Warp wrote:

>   'cat' is a program for concatenating files. It's used like:
> 
> cat file1 file2 file3 > concatenated_files
> 
>   Your program does not fulfill this role.
> 
>   (Some people abuse 'cat' to concatenate one single file with nothing,
> but that doesn't mean that the role of 'cat' is anything else than
> concatenating files.)

Interesting. I thought it was for concatenating a file to stdout...



Alrighty then:

   import System.Environment

   main = do
     args <- getArgs
     mapM_ (\arg -> readFile arg >>= putStr) args

That seems to work.

I'm guessing the real cat program also has assorted command-line 
switches as well though?

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