Enter this command and copy & paste the following two lines:

    crontab -e

* * * * *              /users/emil/sledge-server/tests/cmu-sod/auto_start.sh
* * * * * ( sleep 30 ; /users/emil/sledge-server/tests/cmu-sod/auto_start.sh )


To stop:
    sudo service cron stop

To start:
    sudo service cron start

To remove type:
    crontab -e     
and then remove the above two lines.