crontab -e

0 * * * * wget -O - -q -t 1 http://www.example.com/cron.php
参数说明
# +---------------- minute (0 - 59)
# |  +------------- hour (0 - 23)
# |  |  +---------- day of month (1 - 31)
# |  |  |  +------- month (1 - 12)
# |  |  |  |  +---- day of week (0 - 7) (Sunday=0 or 7)
# |  |  |  |  |
  *  *  *  *  *  command to be executed