Hi all,
I have in my crontab several chained commands similiar 
to this:

3 18 * * * mount -t ext2 /dev/hdc3 /mnt/linuxbackup/ && tar -
cvpPf /mnt/linuxbackup/linuxbackup.tar /home/user/some_directory/ 
> /dev/null 2>&1 && umount /mnt/linuxbackup/ && DISPLAY=:0.0 /usr/
X11R6/bin/xmessage Gratulation!! Daily backup succeeded \:\) 
.. /mnt/backup/ successfully unmounted.

The commands really do exactly what I whant, but there's this 
little part: '> /dev/null 2>&1'
that I have a very foggy comprehension on: I know that this 
part saves me a root message that could be nearly as fat as 
1.5 MB if it was sent to me.
But could someone explain in human understandable words, what
this part exactly means?

Thanks in anticipation
Regards
Wolfgang



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