This library provides an easy way to define command line parsers. Most users
will want to use the "System.Console.CmdArgs.Implicit" module, whose
documentation contains an example.

 * System.Console.CmdArgs.Explicit provides a way to write command line
   parsers for both single mode programs (most programs) and multiple mode
   programs (e.g. darcs or cabal). Parsers are defined by constructing a
   data structure.

 * System.Console.CmdArgs.Implicit provides a way to concisely define
   command line parsers, up to three times shorter than getopt. These
   parsers are translated into the Explicit data type.

 * System.Console.CmdArgs.GetOpt provides a wrapper allowing compatiblity
   with existing getopt parsers, mapping to the Explicit data type.

WWW: http://community.haskell.org/~ndm/cmdargs/