Situation:

I want to run a command that puts itself into the background. If it makes it more possible, then I'll run the command in foreground and bring it into the background by myself.

Question:

pid

I tried the following:

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()

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