Just put this entry in a crontab file (by issuing the "crontab -e" command, for example), and the program named myProgram.sh will be run at 1:30 a.m. using the Bourne shell, and will be run as the user nobody.
30 1 * * * su -c '/path/to/program/myProgram.sh' -s /bin/sh nobody
Of course testing is always recommended, but this has worked for me.
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source:http://linuxpoison.blogspot.com/2008/04/135781758015137.html