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export ANDROID_HOME=/Users/$USER/Library/Android/sdk
export PATH=${PATH}:$ANDROID_HOME/tools:$ANDROID_HOME/platform-tools
If you already installed Android Studio
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echo 'export ANDROID_HOME=/Users/$USER/Library/Android/sdk' >> ~/.bash_profile
echo 'export PATH="$PATH:$ANDROID_HOME/tools:$ANDROID_HOME/platform-tools"' >> ~/.bash_profile
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Add inside env variable PATH option:
C:\Users\USER_NAME\AppData\Local\Android\Sdk\platform-tools