Golang Multiple exec.Command at same time with pipelining

multiple-exec-at-go-example.go

package main

import (
  //  "fmt"
    "os/exec"
    "os"
)

func main()  {
topCommand := exec.Command("top","-d 0.5", "-b", "-n 5")
awkCommand   := exec.Command("grep", "bash")

awkCommand.Stdin, _ = topCommand.StdoutPipe()
awkCommand.Stdout = os.Stdout

_ = awkCommand.Start()
_ = topCommand.Run()
_ = awkCommand.Wait()

//fmt.Println(awkCommand)
}