* * * * *  su daemon -c "/bin/sh /opt/bitnami/apps/magento/htdocs/cron.sh"

* * * * *  command to execute
 ┬ ┬ ┬ ┬ ┬
 │ │ │ │ │
 │ │ │ │ │
 │ │ │ │ └───── day of week (0 - 7) (0 to 6 are Sunday to Saturday, or use names; 7 is Sunday, the same as 0)
 │ │ │ └────────── month (1 - 12)
 │ │ └─────────────── day of month (1 - 31)
 │ └──────────────────── hour (0 - 23)
 └───────────────────────── min (0 - 59)

Minutes [0-59]
|   Hours [0-23]
|   |   Days [1-31]
|   |   |   Months [1-12]
|   |   |   |   Days of the Week [Numeric, 0-6]
|   |   |   |   |
*   *   *   *   *