how can I schedule a reboot in Linux?

I'm new in Linux and I want to schedule a reboot at midnight. How should I do it?

Edits:

• I'm sorry I didn't put the complete details. I want a reboot every 3rd Saturday of the month at 23:30.

• I don't know what's wrong but I cannot find crontab. What I have is cron.d; cron.daily; cron.weekly; cron.monthly;

I'm sorry for the noob question. Pls help me. Thanks.

Type shutdown -r 0:00 and it will reboot at midnight.

If you want to reboot each night, add a cron entry using crontab -e as root to run shutdown -r each midnight

@midnight shutdown -r now

Using crontab.

http://en.wikipedia.org/wiki/Crontab

Adding this entry to /etc/crontab should do:

0 0 * * * /sbin/shutdown -r now

Another option is the at command, available on many Linux distributions. See the man page for more info, but the general syntax for your purpose would be:

echo "reboot" | at 0000 jun 27

To quote the OS X man page:

at - executes commands at a specified time

Sound like what we're talking about. ;)

As far as I know, you cannot use cron to schedule tasks for "last Friday of each month" or "third Thursday in each month". What you can do, however ugly it seems, is to have a script run every Saturday at 23:30 and then have this script determine if this particular Saturday is the third Saturday of the week (can be done using date and maybe cal commands).

I hope this helps. I have not found an elagant solution to this problem. I found this thread, because I was searching for a solution for the same problem.