/proc/cpuinfo
will not return the serial number of the system.
If you do not need this information it would be an easy approach without additional resources. (provided it is a *nix system):
 my @systeminfo = `cat /proc/cpuinfo`;

In reply to Re^2: how I can find Processor serial number or (Processor ID) ? by walto
in thread how I can find Processor serial number or (Processor ID) ? by amitbhosale

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