Installing Drush on Mac OS X

drush_osx

How to install Drush on Mac OS X Mountain Lion.

1. Download the latest version of Drush to your local folder (e.g. Desktop)
2. Launch Terminal and change directory (where drush is downloaded)

    cd ~/Desktop
3. Extract it.
4. Create  /usr/local/lib if it does not exist (otherwise, skip this step)
    sudo mkdir /usr/local/lib/
5. Move it to /usr/local/lib
    sudo mv drush /usr/local/lib/
6. Make it executable
    sudo chmod u+x /usr/local/lib/drush/drush
7. Then stick it in /usr/bin/ so that you can run it from anywhere
    
sudo ln -s /usr/local/lib/drush/drush /usr/bin/drush
8. Check if it works
    drush --version

Also check "Installing Drush on Mac Os X using Homebrew"
http://drupal.org/node/954766