// Removes old simulators, which xcode no longer uses
$ xcrun simctl delete unavailable

// xcrun allows you to invoke developer tools from the terminal.
// In this case simctl, which is a command line utility to control the iOS Simulator.
// simctl has the subcommand: openurl to open URLs in a given simulator
// most of the cases you would like to open on the current booted device, so you add 
// the flag booted or type the simulator id.
$ xcrun simctl openurl booted "http://google.com"

// Print the UUID of the device in your simulator
$ xcrun simctl list | egrep '(Booted)'