Set up ADB environment in Mac OSX

• Open Terminal
• Type cd ~ this will take you to your home directory
• Type touch .profile this will create a hidden file named profile
• Type open -e .profile this will open the file you just created in TextEdit
• In the file, type exportPATH=${PATH}:/pathToTheAndroidSdkFolder/android-sdk-mac_86/platform-tools
• Save file, close TextEdit, Quit Terminal, and Relaunch Terminal
• NOTE: By creating an environment variable you won't need to cd to the Android/tools folder every time you want to run ADB

Reference: http://esausilva.com/2010/10/02/how-to-set-up-adb-android-debug-bridge-in-mac-osx/