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the hardware and software resources of a computer. At the foundation of all
system software, the OS performs basic tasks such as controlling and
allocating memory, prioritizing system requests, controlling input and
output devices, facilitating networking, and managing files. It also may
provide a graphical user interface for higher level functions."

Essentially the same thing is said in my OS references. ALL of those
functions - excepting the optional GUI - are in the Linux kernel.
-- 
derek