Updating the Android SDK on Unix-like Systems
Hi! The Tutorial shows you Step-by-Step How to Update the Android Development Kit on Linux/Unix Platforms.
And the Android Software Development Kit (SDK) Command Line Tools is the Collection of Libraries, Tools, Documentation, and Samples that are required to Run and Develop Android Apps.

To Update the Android SDK you have to Run the Android SDK Manager.
- By the Terminal Shell emulator simply with:
android
- From the Android Studio IDE
Select Tools >> Android >> SDK Manager
Then Launch the Android SDK Manager
On the Android SDK Manager Look and Pick the Components to Update…