How to set the cron job for CodeIgniter URL using prefix?

Question

I have an action in my project of CodeIgniter to that I want to hit with via cron.

My cron URL is http://****.***/cron/user/sendmail/

For this I tried:

* * * * * php /home/user/public_html/index.php cron user sendmail

Here

• cron : is the prefix
• user : controller
• sendmail : action

I have to run this with cron prefix because on the basis of this I am updating some configuration.