[Haskell-cafe] Program Command Line Arguments

[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?

Thanks.
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Re: [Haskell-cafe] Program Command Line Arguments

[Brandon S. Allbery KF8NH]

On Mar 10, 2007, at 20:46 , [EMAIL PROTECTED], [EMAIL PROTECTED] wrote:


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?


Take a look at the System.Environment module.

--
brandon s. allbery[linux,solaris,freebsd,perl] [EMAIL PROTECTED]
system administrator [openafs,heimdal,too many hats] [EMAIL PROTECTED]
electrical and computer engineering, carnegie mellon universityKF8NH



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Re: [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)

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