[Haskell-cafe] Program Command Line Arguments

[Donald Bruce Stewart]

Dave:
> My apologies if this is a question with a trivial answer.
> Command line args in C are accessed via argc and argv[]
> defined as arguments to main();.
> 
> How are command line arguments to a ghc-compiled program
> accessed in Haskell? Or is that even possible?

Simplest: System.Environment:getArgs

    import System.Environment
    main = do
        args <- getArgs
        print args

    http://haskell.org/ghc/docs/latest/html/libraries/base/System-Environment.html

Complex:  System.Console.GetOpt

    Example here: http://cgi.cse.unsw.edu.au/~dons/blog/2006/12/18#ph-3
    http://haskell.org/ghc/docs/latest/html/libraries/base/System-Console-GetOpt.html

You can find these functions yourself with hoogle:

    http://haskell.org/hoogle/

Searching for 'args' returns:

    System. getArgs :: IO [String]

Cheers, 
  Don

P.S. This question is best asked on #haskell possibly (http://haskell.org/haskellwiki/IRC_channel)