6.x
Drupal cron from commandline
If you want to add a cronjob without resorting to the normal methods: http://drupal.org/cron using wget, lynx or curl from the commandline you will need the following script.
You can call this script from the commandline: php /path/to/your/drupal/site/cron-cli.php hostname
I built upon the script from http://srhaber.com/blog/2009/02/11/command-line-cron-for-drupal/ and added feedback for the usage.
You will need a php installation on your server that is compiled for cli functionality. http://nl.php.net/manual/en/features.commandline.php