When working with Linux, Unix, and Mac OS X, I always forget which bash config file to edit when I want to set my PATH and other environmental variables for my shell. Should you edit .bash_profile or .bashrc in your home directory?

You can put configurations in either file, and you can create either if it doesn’t exist. But why two different files? What is the difference?

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When you login (type username and password) via console, either sitting at the machine, or remotely via ssh: .bash_profile is executed to configure your shell before the initial command prompt.

But, if you’ve already logged into your machine and open a new terminal window (xterm) inside Gnome or KDE, then .bashrc is executed before the window command prompt. .bashrc is also run when you start a new bash instance by typing /bin/bash in a terminal.

Prey is a lightweight application that will help you track and find your laptop if it ever gets stolen. It works in all operating systems and not only is it Open Source but also completely free.

projectM is an awesome music visualizer. There is nothing better in the world of Unix. projectM's greatness comes from the hard work of the community. Users like you can create presets that connect music with incredible visuals. Try it!

Pdftk allows you to manipulate PDF easily and freely. It does not require Acrobat, and it runs on Windows, Linux, Mac OS X, FreeBSD and Solaris.

Gramps is a free software project and community. We strive to produce a genealogy program that is both intuitive for hobbyists and feature-complete for professional genealogists. It is a community project, created, developed and governed by genealogists.

Let's just say it: Nobody has changed the way we interact with technology like Apple has over the last 10 years. Even if the iPad turns out to be the disaster that many are anticipating, Steve Jobs will still be seen as the hero who turns top-end technology into friendly little gadgets even your grandma can use.

But recently, a faint chorus has been growing--thousands of tech geeks suggesting that if you look under Apple's shiny white veneer, you'll find some practices that are less than user friendly. In fact, some of the things Jobs and Apple are being accused of are so over the top, Lex Luthor would have to take off his hat ... and then use it to cover the dark stain spreading across the front of his pants.

Apple is marketing the iPad as a computer, when really it's nothing more than a media-consumption device - a convergence television, if you will. Think of it this way: One of the fundamental attributes of computers is that they are interactive and reconfigurable. You can change the way a computer behaves at a very deep level. Interactivity on the iPad consists of touching icons on the screen to change which application you're using. Hardly more interactive than changing channels on a TV.

DRM is used by Apple to restrict users' freedom in a variety of ways, including blocking installation of software that comes from anywhere except the official Application Store, and regulating every use of movies downloaded from iTunes. Apple furthermore claims that circumventing these restrictions is a criminal offense, even for purposes that are permitted by copyright law.

Apple (AAPL) is in talks with Microsoft (MSFT) to replace Google (GOOG) as the default search engine on its iPhone, according to two people familiar with the matter. The talks have been under way for weeks, say the people, who asked not to be named because the details have not been made public.

XBMC is an award-winning free and open source (GPL) software media player and entertainment hub for digital media. XBMC is available for Linux, OSX, Windows, and the original Xbox.

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Currently XBMC can be used to play almost all popular audio and video formats around. It was designed for network playback, so you can stream your multimedia from anywhere in the house or directly from the internet using practically any protocol available. Use your media as-is: XBMC can play CDs and DVDs directly from the disk or image file, almost all popular archive formats from your hard drive, and even files inside ZIP and RAR archives. It will even scan all of your media and automatically create a personalized library complete with box covers, descriptions, and fanart. There are playlist and slideshow functions, a weather forecast feature and many audio visualizations. Once installed, your computer will become a fully functional multimedia jukebox.