display command output.

go/qst.go

		for {
			log.Printf("running %s", r.shellCmd)
			r.cmd = exec.Command("sh", "-c", r.shellCmd)
			r.cmd.Stderr = os.Stderr
			r.cmd.Stdout = os.Stdout
			r.cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
			err := r.cmd.Run()
			log.Printf("%s finished: %s", r.shellCmd, err)