For all of these steps you'll need the path to the executable(s). This includes in part the location you found SDK Readme.txt, which we'll call the base directory. As an example, if you found that file in /home/ranjeet/Android/Sdk/ then that will be the base directory. There are two primary subdirectories that contain the programs for the Android SDK. The primary one that you will likely want is android, which is the SDK manager, and using that base example, it's path will be: /home/ranjeet/Android/Sdk/tools/android