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Here is the List of some of the very useful sites which contains free online books and Tutorial on LINUX ∓ UNIX

LINUXBOOKS

1. Novell Certified Linux 9 (CLE 9) Study Guide : (free in RAR format ) ( Book)
   The Novell Certified Linux Engineer (CLE) Study Guide is designed to prepare you for the challenge of the most current CLE practicum. The author's experience as a certification trainer and system administrator will provide you with a real-world understanding of how to administer and troubleshoot Novell Linux products and services. Exam topics are covered through real-world examples with guided steps that were developed in the field. With the Novell Certified Linux Engineer (CLE) Study Guide, you will master the knowledge of administering and troubleshooting the Novell Linux systems and prepare for CLE exam success.
   (Link taken from Google search)
2. Linux For Dummies, 8th Edition 2007 : (free in RAR format ) ( Book)
   Pub. Date: July 2007
   Substantially revised and updated with new material on setting up a wireless home network, recycling an old Windows computer as a Linux home-networking server, running Linux on a laptop, editing digital photos, managing and playing audio and video, using open source productivity software, and more. (Link taken from Google search)
3. Red Hat Enterprise Linux 5 Administration Unleashed: (free in PDF format ) ( Book)
   PUB DATE : April 20, 2007
   LANGUAGE : English
   FORMAT : PDF
   SIZE : 04 x 1.44 MB
   Red Hat Enterprise Linux 5 Administration Unleashed contains extensive
   coverage of network and web services, from the Apache HTTP server and Sendmail email services to remote login with OpenSSH. Fox also describes Red Hat's most valuable tools for monitoring and optimization and presents thorough coverage of security-including a detailed introduction to Security-Enhanced Linux (SELinux). (Link taken from Google search)
4. Sybex Linux Network Servers : (free in PDF format ) ( Book)
   This book covers topics like deployment and configuration of linux for network servers. Should buy this bok if you wants to get the maximum out of your network running on linux. (Link taken from http://www.ssuet.edu.pk/%7Eamkhan/index.html)
5. Linux+ Certification Bible : (free in PDF format ) ( Book)
   An excellent book for preparation for LINUX certification. (Link taken from http://www.ssuet.edu.pk/%7Eamkhan/index.html)
6. Syngress Configuring TCP-IP : (free in PDF format ) ( Book)
   Introduction of working of TCP-IP protocol and about configuring the TCP-IP on the network. (Link taken from http://www.ssuet.edu.pk/%7Eamkhan/index.html)
7. Linux Get Acquainted with Linux Security and Optimization System : (free in PDF format ) ( Book)
   This book covers the aspects of Securing and optimizing Linux for better performance. (Link taken from http://www.ssuet.edu.pk/%7Eamkhan/index.html)
8. E-Book Manual Linux Net Admin Guide : (free in PDF format ) ( Book)
   It is an guide to LINUX administrators. It covers all topics related to Linux administration. (Link taken from http://www.ssuet.edu.pk/%7Eamkhan/index.html)
9. Linux+ Study Guide : (free in PDF format ) ( Book)
   This books is for beginners  who are just getting started with Linux. (Link taken from http://www.ssuet.edu.pk/%7Eamkhan/index.html)
10. Hungry Minds Red Hat Linux Networking and System Admin : (free in PDF format ) ( Book)
    This book covers all topics related to Linux Networking and System administration . (Link taken from http://www.ssuet.edu.pk/%7Eamkhan/index.html)
11. Hungry Minds Red Hat Linux Security and Optimization : (free in PDF format ) ( Book)
    This book covers the aspects of Securing and optimizing Linux for better performance. (Link taken from http://www.ssuet.edu.pk/%7Eamkhan/index.html)
12. Hungry Minds Linux Certification Bible : (free in PDF format ) ( Book)
    An excellent book for preparation for LINUX certification. Covers both Basic and advance stuff. (Link taken from http://www.ssuet.edu.pk/%7Eamkhan/index.html)
13. SANS Securing Linux : (free in PDF format ) ( Book)
    This document covers SANS guidelines for securing Linux . (Link taken from http://www.ssuet.edu.pk/%7Eamkhan/index.html)
14. OReilly Linux Network Administrator's Guide Second Edition : (free in PDF format ) ( Book)
    Linux Network Administrator's Guide is an excellent book for Linux administrators. (Link taken from http://www.ssuet.edu.pk/%7Eamkhan/index.html)
15. OReilly Linux Networking Bookshelf : (free in html format ) ( Book)
    This is a collection of networking books using Linux . (Link taken from http://www.ssuet.edu.pk/%7Eamkhan/index.html)
16. OReilly Linux Servers Hacks: (free in PDF format ) ( Book)
    Tips tricks and various hacks about linux server. A guide to get maximum out of a linux server. (Link taken from http://www.ssuet.edu.pk/%7Eamkhan/index.html)
17. Special Edition Using Linux (4th Ed.): (free in PDF format ) ( Book)
    Special Edition Using Linux covers each and every topic related to Linux and maintain this OS . (Link taken from http://www.ssuet.edu.pk/%7Eamkhan/index.html)
18. Syngress Hack Proofing Linux (2001): (free in PDF format ) ( Book)
    This book covers all security related aspects of Linux . (Link taken from http://www.ssuet.edu.pk/%7Eamkhan/index.html)
19. Linux Command Directory : (free in PDF format ) ( Tutorial)
    A complete Command refrence for linux. (Link taken from http://www.ssuet.edu.pk/%7Eamkhan/index.html)
20. 100 Linux Tips and Tricks : (free in PDF format ) ( Book)
    Collection for tips and tricks used by experts for Linux operating system . (Link taken from http://www.ssuet.edu.pk/%7Eamkhan/index.html)
21. IT - Linux Programmers Guide 0.4 (free in PDF format ) ( Book)
    It s a programmers guide for Linux operating system. (Link taken from http://www.ssuet.edu.pk/%7Eamkhan/index.html)
22. Linux - Advanced Bash Shell Scripting Guide : (free in PDF format ) ( Book)
    This book cover advanced topics related to shell Scripting related to Linux. (Link taken from http://www.ssuet.edu.pk/%7Eamkhan/index.html)
23. Teach Yourself Shell Programming in 24 Hours: (free in PDF format ) ( Book)
    This book is an beginners guide for leaning Shell programming for Linux . (Link taken from http://www.ssuet.edu.pk/%7Eamkhan/index.html)
24. Linux Secure & Optimized Server : (free in PDF format ) ( Book)
    How to secure and Optimeze a linux server for performance. (Link taken from http://www.ssuet.edu.pk/%7Eamkhan/index.html)
25. Linux Security and Optimizing : (free in PDF format ) ( Book)
    How to secure and Optimeze a linux server for performance. (Link taken from http://www.ssuet.edu.pk/%7Eamkhan/index.html)

UNIXBOOKS

1. Advanced UNIX Programming by Richard Stevens : ( free in PDF format ) (BOOK)
   If you are an experienced C programmer with a working knowledge of UNIX, you cannot afford to be without this up-to-date tutorial on the system call interface and the most important functions found in the ANSI C library. Rich Stevens describes more than 200 system calls and functions; since he believes the best way to learn code is to read code, a brief example accompanies each description. (Link taken from Google search)
2. Addison Wesley UNIX Network Programming : ( free in RAR format ) (BOOK)
   The classic guide to UNIX networking APIs... now completely updated!
   
   To build today's highly distributed, networked applications and services, you need deep mastery of sockets and other key networking APIs. One book delivers comprehensive, start-to-finish guidance for building robust, high-performance networked systems in any environment: UNIX Network Programming, Volume 1, Third Edition. (Link taken from Google search)
3. Mastering FreeBSD and OpenBSD Security : (1 MB) ( free in CHM format ) (BOOK)
   Paperback: 350 pages
   Publish date :December 2004
   FreeBSD and OpenBSD are increasingly gaining traction in educational institutions, non-profits, and corporations worldwide because they provide significant security advantages over Linux. Although a lot can be said for the robustness, clean organization, and stability of the BSD operating systems, security is one of the main reasons system administrators use these two platforms. There are plenty of books to help you get a FreeBSD or OpenBSD system off the ground, and all of them touch on security to some extent, usually dedicating a chapter to the subject. But, as security is commonly named as the key concern for today's system administrators, a single chapter on the subject can't provide the depth of information you need to keep your systems secure. (Link taken from Google search)
4. UNIX for Dummies   : ( free in CHM format ) (BOOK)
   UNIX has been evolving feverishly for close to 30 years, sort of like bacteria in a cesspool - only not as attractive. As a result, many different varieties of UNIX have existed along the way. Although they all share numerous characteristics, they differ just enough that even experienced users are tripped up by the differences between versions. (Link taken from Google search)
5. [O'reilly] - UNIX backup and recovery   : (2.40 MB) ( free in RAR format ) (BOOK)
   This book is for UNIX system admin. I covers topics related to Backup and recovery tasks related to UNIX. (Link taken From ftp://194.85.41.42/books/ )
6. eBook - OReilly - Learning the UNIX Operating System  : (1.14 MB) ( free in PDF format ) (BOOK)
   It is an excellent booK on UNIX  Operating System (Link taken From ftp://194.85.41.42/books/ )
7. Unix for Intermediate Users : (free in ZIP format ) ( Book)
   This book is for user who already has basic knowledge about UNIX and want to ain advance level skill on UNIX platform . (Link taken From http://www.bxteam.org/knjige.php )
8. Sun NIS+ and DNS : (free in PDF format ) ( Book)
   This book covers NIS and DNS related to SUN operating System . (Link taken From http://www.diachiweb.com/alpha.htm )
9. Unix Cookbook : (free in PDF format ) ( Book)
   Beginners guide for UNIX operating System . (Link taken From http://www.diachiweb.com/alpha.htm )
10. Unix Implementation : (free in PDF format ) ( Book)
    Beginners Implementation guide for UNIX operating System . (Link taken From http://www.diachiweb.com/alpha.htm )
11. Unix System Security : (free in PDF format ) ( Book)
    This book is for UNIX System Admin for improving the Security of there System. (Link taken From http://www.diachiweb.com/alpha.htm )
12. Unix use and Security : (free in PDF format ) ( Book)
    This book cover all security related topics for UNIX operating System  . (Link taken From http://www.diachiweb.com/alpha.htm )
13. Unix Unleashed : (free in PDF format ) ( Book)
    this book covers each and every topic related to UNIX both at beginners and Advanced level. (Link taken From ftp://194.105.193.56/pub/warez/books/os/)

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I take no responsibility of the material accessible threw this site.None of the book is hosted on this site . I am only providing link to the books hosted on other site which i found by doing extensive search on google.I take no responsibility for the legality of these books.You can check the websites from where the link has takes for the term and conditions for downloading these books.If any one is suffering financial loss due to this then drop a mail to me I will remove the link of that book.