The twentieth anniversary edition of the world's best-selling UNIX system administration book has been made even more invaluable by adding coverage of the leading Linux distributions: Ubuntu, RHEL, and openSUSE. This book approaches system administration in a practical way and is an invaluable reference for both new administrators and experienced professionals. It details best practices for every facet of system administration, including storage management, network design and administration, email, web hosting, scripting, software configuration management, performance analysis, Windows interoperability, virtualization, DNS, security, management of IT service organizations, and much more. UNIX® and Linux® System Administration Handbook, Fourth Edition, reflects the current versions of these operating systems: Ubuntu® Linux, openSUSE® Linux, Red Hat® Enterprise Linux®, Oracle America® Solaris(TM) (formerly Sun Solaris), HP HP-UX®, and IBM AIX®.