"Ultimately, it is the publisher that decides when and whether a
book will be updated. That update isn't going to happen until the
book has not only earned back the money that was spent in its
making, but has earned on top of that whatever the publisher
considers to be a solid profit margin. I'm not the only author
who's had an award-winning book go out of date and then extinct
from sheer lack of sales.
"Books do continue coming out regardless of the ups and downs of
the economy, however, and people fortunately continue buying them.
Some of the ones that the Linux crowd makes heavy use of are old
favorites, updated for today, and others are new. Let's take a look
at some of the best and the brightest stars in the Linux book sky.
Be sure to look in all of the sections, because I may have
something in, say, the Newbies section that an experienced user
would actually find useful as well.
"Some of the books listed in this article are strictly Linux,
some are for Unix in general, and some are related items that Linux
enthusiasts found particularly useful. I'll include the full titles
and ISBNs to try to help you in your searches, but keep in mind
that if there's a newer edition at some point, that edition will
have a new ISBN..."