Situation:个
我想运行一个将其自身置于后台的命令.如果它使它更有可能，那么我将在前台运行该命令，并自己将其带到后台.
Question:
当进程在后台运行时:how can I get it's 100 using Go?
I tried the following:个
cmd := exec.Command("ssh", "-i", keyFile, "-o", "ExitOnForwardFailure yes", "-fqnNTL", fmt.Sprintf("%d:127.0.0.1:%d", port, port), fmt.Sprintf("%s@%s", serverUser, serverIP))
cmd.Start()
pid := cmd.Process.Pid
cmd.Wait()
这会立即返回，并让ssh在后台运行.但是它的pid不是正在运行的ssh进程中的pid.此外，它是父ssh进程的pid，在它Forking 和为自己设置背景之前.
你不需要任何特别的东西，只是不要告诉ssh自己做后台，也不要为此付出代价.例子:
$ cat script.sh
#!/bin/sh
sleep 1
echo "I'm the script with pid $$"
for i in 1 2 3; do
sleep 1
echo "Still running $$"
done
$ cat proc.go
package main
import (
"log"
"os"
"os/exec"
)
func main() {
cmd := exec.Command("./script.sh")
cmd.Stdout = os.Stdout
err := cmd.Start()
if err != nil {
log.Fatal(err)
}
log.Printf("Just ran subprocess %d, exiting\n", cmd.Process.Pid)
}
$ go run proc.go
2016/09/15 17:01:03 Just ran subprocess 3794, exiting
$ I'm the script with pid 3794
Still running 3794
Still running 3794
Still running 3794