Reliable way to determine native packaging system

[Theodore Papadopoulo]

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	I'm trying to find a standard way of finding the native packaging
system of a linux distribution. I'm not sure at all that testing the
presence of {rpm/yum}|{apt-get} is reliable as for example I can
install apt-get of my fedora computer.

So the question is, is there a simple test that can reliably determine
whether a linux machine is rpm or debian based for its native package
scheme ?

	Thank's in advance,

	Theo.
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