| Linux Administrator's Security Guide | |
| Linux Administrator's Security Guide by Kurt Seifried is freely available online. | |
| Red Hat Linux 7 Unleashed | |
| This is a free linux book from Sams Reference Library. Red Hat Linux 7 Unleashed shows you how to install, configure, and manage version 7. | |
| Universal Command Guide: For Operating Systems | |
| Topics covered in this free online book: Every administrative command in Sun Solaris 7 and 8; IBM AIX 4.3.3; OpenBSD 2.7; Red Hat Linux 7; Novell NetWare 3.12, 4.11, 5.1, and 6; Mac OS 9.1; MS-DOS 6.22; and Microsoft Windows 95 through XP. Every command-line command and many graphical command sequences are covered fully, with information on every parameter and command variation. | |
| TCP/IP & Linux Protocol Implementation | |
| TCP/IP & Linux Protocol Implementation: Systems Code for the Linux Internet provides a one-of-a-kind description about using the Linux operating system on a TCP/IP network. Offers detailed explanations on how Linux implements its communications protocols. This is a gzipped Postscript file. | |
| Ubuntu Linux Essentials | |
| Ubuntu Linux Essentials is an online book designed to provide everything a user needs to know to install, use and administer an Ubuntu Linux system. | |
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