Power Button

Hi all,
I am making a battery powered device that uses a Single board computer
running Linux. The problem is that because I am using a CF Card
mounted read/write I cannot just cut the power to the SBC. So I need
to have some system by which the SBC can shutdown properly before it
cuts the power. I am thinking of something like the power button on a
computer.
So does anyone know how I could go about this?
A circuit would be great.
Thanks
-Kit

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