a readFile problem

[Naudts, Guido]

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Hallo, 
I have the following problem:
my program asks the user for a command, when the command is executed a
new command is asked (this is no problem ; an example is in the HUgs
distribution namely Main.hs in the Prolog example.
However one of the commands is: read filename
i.e. read a file and display it. 
I do not succeed in implementing this. 
Could anyone give an example of: reading commands in a loop where one of
the commands is the read command mentionned above. 
Or is it not possible in Haskell? 
I have already wated a lot of time on this, so if anyone gives me an
answer I will be very gratefull.
Greetings,
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