to use cronjob, use the command crontab
install new job, edit the file (vi as editor)
crontab -e
10 0 * lynx http://your.domain.ext/file.php
this will install new job, that will run the lynx (command browser) automatically every day at 10:00
NB:
when you know nothing about vi, you will have problem,
use:
i to insert text
:wq! to save and quit force
