crontab -e 0 3 * * 0 reboot

The first number denotes the minute (0-59). In this case, 0 represents the top of the hour.

The second number denotes the hour (0-23). In this case, 3 represents 3 AM.

The third number denotes the day of the month (1-31). In this case, * matches any day of the month, so this field is ignored.

The fourth number denotes the month of the year (1-12). In this case, * matches any day of the month, so this field is ignored.

The fifth number denotes the day of the week (0-6) beginning with Sunday. In this case, 0 represents Sunday.

The final item is the command to be run. The crontab runs with root privileges, so it has power to reboot the device. A full path, as well as arguments, can be entered here if desired.

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