Need to administer some drupal stuff from the command-line? DRUSH is the answer. But first you need to get it installed. I am putting the commands to run here to do just that for my own future reference. Hope this is of benefit to everyone else!
Check if Pear is installed:
If not, install it…
sudo apt-get install php-pear
Add the drush channel to pear:
pear channel-discover pear.drush.org
pear install drush/drush
Finally, a common use for drush for me is updating modules..
drush pm-update --no-core