package main

import (
  "fmt"
  "time"
  "flag"
  "log"
)

func main() {
  wait_for := "1s"
  message := "test"

  flag.StringVar(&wait_for, "d", "1s", "go time duration to parse")
  flag.Parse()

  if flag.NArg() > 0 {
    message = flag.Args()[0]
  }

  for {
    to_wait, err := time.ParseDuration(wait_for)
    if err != nil { log.Fatal(err) }

    time.Sleep(to_wait)
    fmt.Println(message)
  }
}