I like that quick response!
To the Linux faithful, Microsoft is widely considered to be something akin
to a minion of the king of the Underworld. When it comes to operating
systems, Microsoft is undoubtedly the 800-pound gorilla that all other
companies play second fiddle to; but the Linux phenomenon has given
Microsoft pause. Linux represents a unique challenge to Microsoft, as it is
somewhat decentralized, difficult to sue, and--given its free
nature--difficult to undercut in price.
Quality linux books and CDs
Linux/Unix Quick Command Reference
Available at: www.amazon.com