How to do it…

1. Open the console and create the folder chapter01/recipe09.
2. Navigate to the directory.
3. Create the main_running.go file with the following content:

        package main

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

        func main() {

          var cmd string
          if runtime.GOOS == "windows" {
            cmd = "timeout"
          } else {
            cmd = "sleep"
          }
          proc := exec.Command(cmd, "1")
          proc.Start()

          // No process state is returned
          // till the process finish.
          fmt.Printf("Process state for running process: %v\n",
                     proc.ProcessState)

          // The PID could be obtain
          // event for the running process
          fmt.Printf("PID of running process: %d\n\n", 
                     proc.Process.Pid)
        }

1. Run the code by executing go run main_running.go.
2. See the output in the Terminal:

1. Create the main.go file with the following content:

        func main() {

          var cmd string
          if runtime.GOOS == "windows" {
            cmd = "timeout"
          } else {
            cmd = "sleep"
          }

          proc := exec.Command(cmd, "1")
          proc.Start()

          // Wait function will
          // wait till the process ends.
          proc.Wait()

          // After the process terminates
          // the *os.ProcessState contains
          // simple information
          // about the process run
          fmt.Printf("PID: %d\n", proc.ProcessState.Pid())
          fmt.Printf("Process took: %dms\n", 
                     proc.ProcessState.SystemTime()/time.Microsecond)
          fmt.Printf("Exited sucessfuly : %t\n",
                     proc.ProcessState.Success())
        }

1. Run the code by executing go run main.go.
2. See the output in the Terminal: