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Classic Shell Scripting: Hidden Commands that Unlock the Power of Unix by Arnold Robbins
£18.99
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Firewalls and Internet Security: Repelling the Wily Hacker (Addison-Wesley Professional Computing (Paperback)) by William R. Cheswick
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Building Internet Firewalls by Elizabeth Zwicky
£23.08
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Essential System Administration by AElig;leen Frisch
£27.27
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Programming Perl by Larry Wall
£23.08
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