Main.hs

module Main
( main
) where

import           System.Environment (getArgs)

main :: IO ()
main = putStrLn . unlines . (map (unwords .reverse . words)) . lines =<< readFile . head =<< getArgs

Main.java

import java.io.*;

public class Main {
    public static void main(String[] args) throws IOException {
        FileReader fileReader = new FileReader(args[0]);
        try {
            BufferedReader reader = new BufferedReader(fileReader);
            String line;
            while ((line = reader.readLine()) != null) {
                String[] words = line.split("\\s+");
                for (int i = words.length - 1; i >= 0; --i) {
                    System.out.print(words[i] + " ");
                }
                System.out.println();
            }
        } finally {
            fileReader.close();
        }
    }
}

main.rb

$<.each{ |line| puts line.split(/\s+/).reverse.join(' ') }