[CentOS] How to detect whether running on VMware?

Tony Mountifield wrote:
> Does anyone know how a program, script or shell user can best determine
> whether the machine is running on bare metal or is a VMware guest?
>
>   

This paper show some very interesting tricks:

http://handlers.sans.org/tliston/ThwartingVM*Detection*_Liston_Skoudis.pdf

One simple (but not really foolproof, and only for VMWare) is testing
the MAC address, and look at the OUI bytes; these are assigned to VMWare:

  00-05-69
  00-0C-29
  00-1C-14
  00-50-56