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Just put this line in a file that resides in your /etc/cron.d/ folder, and you're set.
The -q option is used to suppress php headers.
There are 2 alternatives - vote for the best!
If you can do better, submit your command here.
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*/30 * * * * php /address/to/script.php
Indeed, pykler, this is another, more elegant way of doing that.
The reason I used the way I used, is to give a hint about the flexibility of the cron line.
Thanks for the comment!
Dotan
Ok, very bad idea to directly write the crontab file. Firstly, because not always is there. Please, use crontab -e. There's a reason for it. Google it.