升级xcode8后，ideviceinstaller命令运行报错：

Could not connect to lockdownd. Exiting.

解决方法：

sudo chmod -R 777 /var/db/lockdown/

或者一次性解决问题：

brew uninstall ideviceinstaller

brew uninstall libimobiledevice

brew install --HEAD libimobiledevice

brew link --overwrite libimobiledevice

brew install ideviceinstaller

brew link --overwrite ideviceinstaller