Installing and runnig Drush
Drush is command line shell and scripting interface for Drupal and is quite usefull.
It works best on Linux and Mac and not so on Windows.
The steps to install it on Ubunto are
1. Download Drush http://drupal.org/project/drush
2. Change permision so that the files is executable
3. Make symbolic link to the file in /home/username/bin
ln -s /home/username/drush/drush /home/username/bin/drush