crontab and reboot

[Tim Henderson]

> Had a look at man for crontab(1) and crontab(5).  Looks like you need
>
> 0 */4 * * * root shutdown -r now
>
> Suggest you have a look at these man files and see if you agree with me!
>

This is the correct format.  However, I would suggest always using the 
full path to binaries and scripts when calling from crons (or scripts). 
  For instance:

1 */4 * * * /sbin/shutdown -r now

or

1 */4 * * * /sbin/reboot

Tim H.