Which Programming Language?
The C Programming Language, 3rd Edition, by Brian Kernighan and Dennis Ritchie (Prentice Hall)--originally written in 1978, this is the classic introduction to C by the language authors.
Learn C++ on the Macintosh, by Dave Mark (Addison-Wesley)--don't let the word "Macintosh" on the cover deter you. This is one of the best introductory descriptions of C++ I've come across. It assumes some prior knowledge of C. All of the programming examples will run on Linux. The same author has also written Learn Java on the Macintosh which I also highly recommended.
The C++ Programming Language (3rd edition), by Bjarne Stroustrup (Addison-Wesley)--the classic C++ text by the language author. You can't call yourself a C++ programmer unless you own this book. Also of interest, and by the same author, is The Design and Evolution of C++ (Addison-Wesley).
Java in a Nutshell, 3rd Edition, by David Flanagan (O'Reilly)--if you already know C and/or C++, then this book will get you up to speed with Java quickly. It also serves as a very handy quick reference to the language.
Learning Python, by Mark Lutz and David Ascher (O'Reilly)--a gentle introduction to all things Python. The ins and outs of OO are also covered in sufficient detail to provide a taste of this programming technology to newcomers.
Essential Python Reference, by David Beazley (New Riders)--a good review of the language features, and an excellent desktop reference.
Perl: A Programmer's Companion, by Nigel Chapman (Wiley)--when moving to Perl from another programming language, there is no better text (in my opinion) than this one. This is my favorite Perl book.
Programming Perl, 3rd Edition, by Larry Wall, Tom Christiansen and Jon Orwant (O'Reilly)--affectionately known as "The Camel", this classic reference to Perl (which has been recently revised) is a must-have for all serious Perl programmers.
http://www.gnu.org - the home of the GNU Project (and gcc).http://www.research.att.com/~bs/C++.html - Bjarne Stroustrup's homepage, the creator of C++.http://www.kdevelop.org - the official homepage for the KDE KDevelop IDEhttp://www.redhat.com/products/support/gnupro/ - the list of "professional" RedHat developer tools, including information on Source Navigatorhttp://glade.pn.org - the GTK+/Gnome Interface Builderhttp://java.sun.com - the official home of Java Technology, at Sun Microsystemshttp://www.python.org - the official website for the Python programming communityhttp://www.jpython.org - the JPython websitehttp://sourceforge.net/projects/jython - information on the Jython project, the successor to JPythonhttp://www.perl.com - Perl's home on the Internethttp://www.cpan.org - Perl's Comprehensive Perl Archive Network (CPAN)
Paul Barry (firstname.lastname@example.org) lectures in Computer Networking at The Institute of Technology, Carlow in Ireland (http://www.itcarlow.ie). Since 1986 (and under various guises), he has been paid to program in COBOL, Fortran, Pascal, C and C++. Despite studying Java and Python in detail, his favorite programming language remains Perl.