How to use/activate Drupal cron.php in crontab on openSuse Linux.

Logon to your Linux system as admin or with sudo rights and open /etc/crontab. Add the following lines to the crontab:

#drupal cronjob

 * 5 * * * postfix /usr/bin/wget -O - -q -t 1 https://<Your website URL>/cron.php?cron_key=<Your system key>

From now on the cron.php will be executed everyday at 5 a.m.

 OR

#drupal cronjob

 */5 * * * * postfix /usr/bin/wget -O - -q -t 1 https://<Your website URL>/cron.php?cron_key=<Your system key>

From now on the cron.php will be executed all day every fifth minute.

 OR

#drupal cronjob

 * * * * * postfix /usr/bin/wget -O - -q -t 1 https://<Your website URL>/cron.php?cron_key=<Your system key>

From now on the cron.php will be executed all day every minute.