Clear and preload cache via cronjob

Hello!

I am wondering if there is a way to clear nad preload the whole cache via cronjob and not via “Crawl Interval”.
What I mean by that is to:

1. create a php file named “clear-and-preload-whole-cache.php”
2. setup a cronjob that will fire this php file at the specific time and purge and preload the whole cache

Can anybody provide me with the code for such a php file to achieve this goal?

…and in addidtion how to disable “Crawl Interval” when php file will do its work?

Will applreciate any help.

Thank you,

Greg