abd coomand is not detecting in cmd mac code example

Example 1: how to access adb globally on mac

echo 'export ANDROID_HOME=/Users/$USER/Library/Android/sdk' >> ~/.bash_profile
echo 'export PATH=${PATH}:$ANDROID_HOME/tools:$ANDROID_HOME/platform-tools' >> ~/.bash_profile

Example 2: adb command not found mac

ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"