来个css的

*:before,
*:after { content:'hello word' }

Fortran:
-------------------------------------------------

program main
    write (unit = *, fmt = * ) "hello, world!"
    stop
end program main

=================================================

传中的BrainFuck:
-------------------------------------------------

++++++++++[> +++++++> ++++++++++> +++ < < <-]> ++.> +.+++++++
..+++.> ++. < <+++++++++++++++.> .+++.------.--------.> +.

Ruby:

puts "Hello World"

来个 python 的

#!/usr/bin/env python
print("hello world")

我来个lua的

-- hello world from lua

io.write("Hello world")

我来个java的

public class HelloWord {
	public static void main(String[] args) {	
		System.out.println("hello world");
	}
}

我来个haskell版本的

module Main where
 
main :: IO ()
main = putStrLn "Hello, World!"

shell 也算语言吧?

printf "Hello world"

来个AS的，现问的人 -。-

trace("Hello world")

各位大神都不写C的啊。。那我献丑了-。-

#include <stdio.h>

int main() {
    printf("Hello, world!");
    return 0;
}