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function bt-ctl(){
  case "$1" in
    off)
      sudo launchctl unload /System/Library/LaunchDaemons/com.apple.blued.plist
      sudo kextunload -b com.apple.iokit.IOBluetoothSerialManager
      sudo kextunload -b com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport
      ;;
    on)
      sudo launchctl load /System/Library/LaunchDaemons/com.apple.blued.plist
      sudo kextload -b com.apple.iokit.IOBluetoothSerialManager
      sudo kextload -b com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport
      ;;
  esac
}