Simple Haskell script for UNIX-like systems. Commented for education.

reverse.hs

#! /usr/bin/runhaskell
module Main where

-- As with many programming languages, the main function is the entry point for execution.
main :: IO ()
main = do -- "do notation" is a way of sequencing functions in haskell to simulate imperitive programming.
	inp <- getContents -- Here we bind the resulting thunk from getContents to the name 'inp'.
	putStrLn $ reverse inp -- Here we reverse the evaluated value of 'inp' and send it to stdout.