Unable to launch Android SDK Manager in Terminal

The directory contains a file called android, so presumably what they mean is run ./android sdk (unless . happens to part of your PATH). Also see: How to add a directory to the PATH?, so that you don't need to navigate there and run ./android.

Go to tools directory inside your android sdk like:

cd /home/Android/Sdk/tools

and start Android SDK Manager by:

./android

This question is rather old, but still I feel its worth explaining that Android have made great effort to make this easier for all, windows mac and linux.

The SDK has now moved to an easy GUI, please follow the instructions below to get it.

Now you have android studio: https://developer.android.com/studio/index.html

With this download, you simply have to extract it, I did it in my home but this is just my choice.

Once you have extracted it, you will then simply need to

navigate to the android-studio/bin/ directory, and execute studio.sh - Please see here for full installation instrutions taken from Android Studio Install Guide

You will simply have to follow an onscreen GUI which will then finish installing.

If it does not restart, please run the above command again.

You will see this screen:

Now please click configure

This will create you a desktop searchable item.

Now click the same menu and find the SDK Manager and you can manage everything from there