Daily reboot (debian/ubuntu/etc)

If you want to reboot your linux box daily you can use cron and shutdown or reboot commands.

First login as root then:

crontab -e

Add line (command will run at 2:05 am and it will give warning about reboot to all users and reboot in 10 minutes):

5 2 * * * /sbin/shutdown -r +10 

Crontab command explanations (http://www.adminschoice.com/crontab-quick-reference): 

*     *   *  *   *  command to be executed -     -    -   -  - |     |     |   |    | |     |     |   |    +----- day of week (0 - 6) (Sunday=0) |     |     |   +------- month (1 - 12) |     |     +--------- day of month (1 - 31) |     +----------- hour (0 - 23) +------------- min (0 - 59)

If you have other location for shutdown command, you can search it with:

find / -name shutdown

Also if you have problems with shutdown-command you can try using reboot-command.