There currently aren't any books written specifically for FreeBSD, although some people are supposedly working on some.
The FreeBSD Documentation Project exists, you may contact (or
better join them) on the doc mailing list:
<doc@FreeBSD.ORG>
.
A FreeBSD ``handbook'' is being created, and can be found as:
FreeBSD's Handbook Note that this is a work in progress, and so parts may be incomplete.
However, as FreeBSD 2.X is based upon Berkeley 4.4BSD-Lite, most of the 4.4BSD manuals are applicable to FreeBSD 2.X. O'Reilly and Associates publishes these manuals:
4.4BSD System Manager's Manual
By Computer Systems Research Group, UC Berkeley
1st Edition June 1994, 804 pages
ISBN: 1-56592-080-5
4.4BSD User's Reference Manual
By Computer Systems Research Group, UC Berkeley
1st Edition June 1994, 905 pages
ISBN: 1-56592-075-9
4.4BSD User's Supplementary Documents
By Computer Systems Research Group, UC Berkeley
1st Edition July 1994, 712 pages
ISBN: 1-56592-076-7
4.4BSD Programmer's Reference Manual
By Computer Systems Research Group, UC Berkeley
1st Edition June 1994, 886 pages
ISBN: 1-56592-078-3
4.4BSD Programmer's Supplementary Documents
By Computer Systems Research Group, UC Berkeley
1st Edition July 1994, 596 pages
ISBN: 1-56592-079-1
A description of these can be found via WWW as:
A good book on system administration is:
Evi Nemeth, Garth Snyder, Scott Seebass & Trent R. Hein,
``Unix System Administration Handbook'', Prentice-Hall, 1995
ISBN: 0-13-151051-7
NOTE make sure you get the second edition, with a red cover, instead of the first edition.
This book covers the basics, as well as TCP/IP, DNS, NFS, SLIP/PPP, sendmail, INN/NNTP, printing, etc.. It's expensive (approx. US$45-$55), but worth it. It also includes a CDROM with the sources for various tools; most of these, however, are also on the FreeBSD 2.1.0R CDROM (and the FreeBSD CDROM often has newer versions).