In this video we walk through the steps to install Drush on *nix system (i.e. Linux, Unix, or Mac OS X). Drush is not a normal Drupal project and the installation and set up is quite different than for a module. We cover requirements and downloading, then make sure Drush is executable and in our system $PATH variable so we can use Drush from any directory.
One of our members, David, offered the following tip:
I had an issue with OSX Lion and the new drush 5.0... When using the drush command the following error occurred:
/usr/bin/env: bad interpreter: Operation not permitted
This is due to Lion Quarantining the files as they are from the internet. Remove the quarantine attribute with:
xattr -d com.apple.quarantine drush
The Drush command should work now! I hope I saved someone the 2 hours of anguish this caused me.