Recently, when I added a cron tab, I couldn't get it work no matter what I did. The file which I had to run via cron was inside the Drupal root and I added the following code to cron tab using,
Cron
A few Drupal users using Drupal Boost were encountering a situation where the manual changes they made to the Boost generated .htaccess file like uncommenting the SetHandler Drupal_Security_ Do_Not_Remove_See_SA_2006_006 directive was getting rewritten during CRON runs. If you are encountering the same situation in your Drupal site when using Boost then read on to find out more.