"There can't be many people who haven't heard of Linux. In
short, it's an operating system just like Windows but, unlike
Windows, you won't find it on many PCs you buy from the high street
or from computer magazines.
"The reason for its popularity is threefold. First, most
versions of Linux (of which more later) are free; second, anyone
can modify it to suit their needs; and third, it runs well on
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