Howto shutdown Linux box automatically?

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Do it once:
e.g. shutdown your linux box at 7:30 January 10th:

at 7:30 jan 10
> shutdown -h now
> CTRL-D

... make sure the at daemon is running:

/etc/init.d/atd start or rcatd start for SuSE

... and check your at queue:

atq

Do it regularly:
e.g. kill your computer every day at midnight (to make sure you get enough sleep):

crontab -e -u root
> 0 0 * * * /sbin/shutdown -h now
... save and exit ...