How to setup a cron job in Magento module?

Question

I wanted to setup a cron job inside my module. I followed the instructions on Magento wiki - how_to_setup_a_cron_job, but my cron job is simply not executing.

This i

Answer 1

before that you have to run this script in your terminal. For ubuntu:*/1 * * * * /usr/bin/php /var/www/html/modulename/cron.php > /dev/null