Timestamper

timestamper.go

package main

import (
	"bufio"
	"fmt"
	"os"
	"time"
)

func main() {
	reader := bufio.NewReader(os.Stdin)

	for {
		line, err := reader.ReadString('\n')

		if err != nil {
			break
		}

		fmt.Print(time.Now().UTC(), "|", line)
	}
}

timestamper.hs

import System.IO (isEOF)
import Data.Time (getCurrentTime)
import Control.Monad (liftM2, unless)
 
stamp (x, y) = x ++ "|" ++ y

currentTime = fmap show getCurrentTime

main = isEOF >>= flip unless repl
  where
    input = liftM2 (,) currentTime getLine
    repl = fmap stamp input >>= putStrLn >> main

timestamper.rs

extern crate time;

use std::io;
use time::now_utc;

fn main() {
    for line in io::stdin().lines() {
        print!("{}|{}", now_utc().rfc822z(), line.unwrap());
    }
}