title: How to set up cron job on CentOS
body: <p>I don't know how to set up cron with ssh?
  I opened ssh and typed "crontab -e". What do I do then? 
  I want to repeat the function every minute. I have this code as "cron command to run": php -f /var/www/vhosts/nf-test-host.tk/httpdocs/admin/cron/cron.php.</p>
  
  <p>I am on CentOS. What should I do, exactly? Thanks in advance!</p>