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There are 3 options available for you to install ADB on macOS

Option 1 – Using Homebrew

This is the easiest way and will provide automatic updates.

1. Install homebrewruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
2. Install adbbrew cask install android-platform-tools
3. Start using adbadb devices

Option 2 – Manually (just the platform tools)

This is the easiest way to get a manual installation of ADB and Fastboot.

1. Delete your old installation (optional)rm -rf ~/.android-sdk-macosx/
2. Navigate to https://developer.android.com/studio/releases/platform-tools.html and click on the SDK Platform-Tools for Mac link.
3. Go to your Downloads foldercd ~/Downloads/
4. Unzip the tools you downloadedunzip platform-tools-latest*.zip
5. Move them somewhere you won’t accidentally delete themmkdir ~/.android-sdk-macosx mv platform-tools/ ~/.android-sdk-macosx/platform-tools
6. Add platform-tools to your pathecho 'export PATH=$PATH:~/.android-sdk-macosx/platform-tools/' >> ~/.bash_profile
7. Refresh your bash profile (or restart your terminal app)source ~/.bash_profile
8. Start using adbadb devices

Option 3 – Manually (with SDK Manager)

1. Delete your old installation (optional)rm -rf ~/.android-sdk-macosx/
2. Download the Mac SDK Tools from the Android developer site under “Get just the command line tools”. Make sure you save them to your Downloads folder.
3. Go to your Downloads foldercd ~/Downloads/
4. Unzip the tools you downloadedunzip tools_r*-macosx.zip
5. Move them somewhere you won’t accidentally delete themmkdir ~/.android-sdk-macosx mv tools/ ~/.android-sdk-macosx/tools
6. Run the SDK Managersh ~/.android-sdk-macosx/tools/android
7. Uncheck everything but Android SDK Platform-tools (optional)

1. Click Install Packages, accept licenses, click Install. Close the SDK Manager window.

1. Add platform-tools to your pathecho 'export PATH=$PATH:~/.android-sdk-macosx/platform-tools/' >> ~/.bash_profile
2. Refresh your bash profile (or restart your terminal app)source ~/.bash_profile
3. Start using adbadb devices

Source : https://stackoverflow.com/questions/31374085/installing-adb-on-macos