列出所有的dbus服务

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dbus-send --system --print-reply --dest=org.freedesktop.DBus /org/freedesktop/DBus org.freedesktop.DBus.ListActivatableNames


返回结果如下：
method return sender=org.freedesktop.DBus -> dest=:1.72 reply_serial=2
   array [
      string "org.freedesktop.DBus"
      string "org.freedesktop.login1"
      string "net.connman.vpn"
      string "org.freedesktop.systemd1"
      string "org.freedesktop.PolicyKit1"
      string "org.freedesktop.hostname1"
      string "org.bluez"
      string "org.pacrunner"
      string "org.freedesktop.PackageKit"
      string "org.freedesktop.UPower"
      string "cmos.phone.rpm.query"
      string "cn.cmos.installer"
      string "fi.epitest.hostap.WPASupplicant"
      string "org.gnome.GConf.Defaults"
      string "org.freedesktop.timedate1"
      string "fi.w1.wpa_supplicant1"
      string "org.freedesktop.locale1"
   ]