取代目前的程序

In Ruby, you can use Kernel.exec to replace the current executing process by the one triggered.

Is it possible to do the same thing in Go?

This is the equivalent to Kernel.exec:

package main

import "fmt"
import "syscall"

func main() {
    if err := syscall.Exec("/bin/ls", []string{"ls", "-l"}, []string{}); err != nil {
      fmt.Println(err)
    }
}

but it is not portable.