Shutting down Mac using power button?

Hi,
A simple question perhaps, but is it possible (using some tool, don't think it can be done in OS X) to have a Mac (Pro) shut down (normal shut down, no forcing) by pressing the power button on the machine, without having to access a keyboard or mouse to confirm the shutdown?
Best,
Maarten

Send command in terminal locally? like
SHUTDOWN(8) BSD System Manager's Manual SHUTDOWN(8)
NAME
shutdown -- close down the system at a given time
SYNOPSIS
shutdown [-] [-h [-u] | -r | -s | -k] [-o [-n]] time [warning-message ...]
DESCRIPTION
The shutdown utility provides an automated shutdown procedure for super-users to
nicely notify users when the system is shutting down, saving them from system
administrators, hackers, and gurus, who would otherwise not bother with such
niceties.

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