there was a minor mistake in the above, fixed on the wiki page. 2007/4/10, Thomas Hartman :

New wiki page: Checking for correct invocation of a command line haskell program

at

http://haskell.org/haskellwiki/Checking_for_correct_invocation_of_a_command_...

This is a simple cookbook / boilerplate example I thought should go in a haskell wiki somewhere.

I linked it from

http://haskell.org/haskellwiki/Simple_unix_tools

Perhaps it could be linked from other places as well.

Hope this helps!