This video will show you how to install latest Xcode and Command Line Tools..
Link to download Xcode :- http://stackoverflow.com/questions/10...
or
https://developer.apple.com/downloads/
Download Command Line Tools :- https://developer.apple.com/downloads/
To check Available iOS SDKs in Terminal :- $ xcodebuild -showsdks
For seeing the iOS instruments (emulators) available type and run this in your terminal :- $ instruments -s devices
Facebook Link: / iosapplicationdevelopers