main.go

package main

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

func main() {
        cmd := exec.Command("sleep", "1024")

        err := cmd.Start()
        if err != nil {
                fmt.Println("Failed to Start cmd.")
                return
        }

        fmt.Printf("cmd pid= %d\n", cmd.Process.Pid)
        // _ = cmd.Process.Release()

  // If I press Ctrl-C here, the process of `/bin/sleep` will gone.
  // $ go run .
  //  cmd pid= 2536
  //  ^Csignal: interrupt
  // $ ps -ef | grep 2536
  //  xiaolin   2797 32610  0 16:25 pts/63   00:00:00 grep --color=auto 2536
  //
  // But, in case if we wait 10 seconds, the process of `/bin/sleep` will keep running, and it's parent-pid will become 1.
  // $ go run .
  //  cmd pid= 2980
  // $ ps -ef | grep 2980
  //  xiaolin   2980     1  0 16:25 pts/63   00:00:00 sleep 1024
  //  xiaolin   3327 32610  0 16:25 pts/63   00:00:00 grep --color=auto 2980

        time.Sleep(time.Second * 10)
}