Where can i find free online books about UNIX systems administration?

O'Reilly & Associates provides a plethora of hardcover books on System
Administration. Their website does not include free complete versions
of their books, but does include many excerpts and sometimes full
chapters. For instance their "Essential System Administration, 2nd
Edition" has the entire Chapter 3 online which covers "Essential
Administrative Tools." Find this chapter at
http://www.oreilly.com/catalog/esa2/chapter/ch03.html and find more
System Administration books at http://sysadmin.oreilly.com/

InformIT.com has a free library (requires free registration) of
technical books including "Unix Hints & Hacks" and "Developing Unix
Applications" as well as on subjects like TCP/IP, Samba and Shell
Programming. Find the InformIT Free Library at
http://www.informit.com/isapi/free_library/index.asp

While not a book in the traditional sense, a University of Washington
posted the course notes from "Unix System Administration - A Survival
Course". This is available freely at
http://unix.about.com/gi/dynamic/offsite.htm?site=http%3A%2F%2Fwww.washington.edu%2FR870%2FR870.html

Another course that put the notes online is The Ohio State
University's Frank G. Fiamingo's Unix System Administration course.
The course notes book is offered in Acrobat PDF, PostScript and HTML
formats. Find it at http://wks.uts.ohio-state.edu/sysadm_course/sysadm.html

Another of Frank G. Fiamingo's courses is Introduction to Unix. While
not System Administrator oriented it may provide a good resource for
basic Unix information. It is also available in Acrobat PDF,
PostScript and HTML formats at
http://wks.uts.ohio-state.edu/unix_course/


Additional information:

Sysadm: Links for System Administrators
http://www.sai.msu.su/sysadm.html

Unix System Administrator's Resources
http://www.stokely.com/unix.sysadm.resources/

SysAdmin's Bookshelf
http://www.usenix.org/sage/sysadmins/books/booklist.html

RootPrompt: Slashdot-style Unix resource
http://www.rootprompt.org/

Webreference: Unix Tutorials
http://webreference.com/programming/unix/


Search terms used:

unix system administration books
://www.google.com/search?q=unix+system+administration+books

This was my first question, and admittedly it was a test and a
challenge to see how this whole system works. I really like it. As to
the answer I received, it was good. It's informative and a great
starting point for further search. The answer was very appropriate
given the fact that I only put up $5 for it. I didn't really learn
anything great and new as far as published online books go (I'm
already a member at informIT, I use O'Reilly's and FreeBSD's websites
almost daily) but this is not due to the fact that the answer is low
in quality, but rather that it is difficult to nearly impossible to
find complete free online books that aren't outdated. What I really
liked and give the author of this research props for (and is probably
the reason i chose 5 stars instead of 4), is the fact that s/he
extended my question reasonably and found those links to the course
notes which I checked out, and they're actually really good - pretty
much like a full online book! I will definitely use this system in the
future when I have difficult research topics or simply no time to do
the research myself. Thanks Google, thanks researcher-ga.

You can also find complete documentation online from specific vendors.
 For example, you can find Sun's Solaris documentation here:
http://docs.sun.com/.  They offer a 3 volume series on Solaris System
Administration here:
http://docs.sun.com/ab2/coll.47.11/@Ab2CollView?Ab2Lang=C&Ab2Enc=iso-8859-1

FreeBSD's Handbook offers 15 chapters on system administration:
http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/index.html

Finally, the Linux Documentation Project
(http://www.tldp.org/index.html) offers many HOWTO's, guides, and
FAQ's.  Under their list of guides (http://www.tldp.org/guides.html),
they offer two online books on Linux System Administration.

A very useful and free book about using Linux is The Linux Cookbook by
Michael Stutz.  It is a task-oriented guide to using Linux for
everyday projects, like writing letters, listening to and making
music, and working with graphics.  It's a print book on No Starch
Press, but you can download the entire thing and even use parts in
your own writing (it is written with a GPL-like license) at
http://www.dsl.org/cookbook

You can also find a number of free (albeit not necessarily recent)
computer books online through a database at
http://hoganbooks.com/freebook/webbooks.html.  This site basically
provides links to computer books at other sites (probably ones already
mentioned), but it is a convenient way to check multiple sites at
once.

http://www.wilyhacker.com
has the complete copy of "Firewalls and Internet Security: Repelling
the Wily Hacker"
by William R. Cheswick and Steven M. Bellovin

http://www.EverythingSysadmin.com
has Appendix B (which is useful, and funny; but then again, I co-wrote
it) of "The
Practice of System and Network Administration" by Limoncelli & Hogan

I hope you enjoy both!
Tom Limoncelli

Hello:
Another excellent source for FREE online technical books is
IBM's website - http://www.redbooks.ibm.com/.
I have used their TCP/IP book and it is very illustrative.
(Remember it is over 700 pages).
I see they have links to Linux and Unix as well.

-Raj