Input and Output
      module Main where
      main :: IO ()
      main = putStrLn "Hello World!"
  
                                A quick reference for Etlas
      module Main where
      main :: IO ()
      main = putStrLn "Hello World!"
  
                                Usage: etlas init [FLAGS]
$ etlas init
Usage: etlas build [TARGETS] [FLAGS]
$ etlas build
Usage: etlas update
$ etlas update
Usage: etlas --help or etlas --h
$ etlas --help
Usage: etlas --version or etlas --v
$ etlas --version
Usage: etlas --numeric-version
$ etlas --numeric-version