December 28th, 2010, 06:23 AM
|man 5 crontab
is your friend.
For quick reference,try
45 * * * * /path/to/command
The moon on the one hand, the dawn on the other:
The moon is my sister, the dawn is my brother.
The moon on my left and the dawn on my right.
My brother, good morning: my sister, good night.
-- Hilaire Belloc