@reboot /path/to/execuable1The above example will execute /path/to/executable1 when the system starts. For more information on special strings enter "man 5 crontab". Crontab Options The -l option causes the current crontab to be displayed on standard output. The -r option causes the current crontab to be removed. The -e option is used to edit the current crontab using the editor specified by the E