HOW-TOs

The Sysadmin's Toolbox: iftop

Who's using up all the bandwidth, and what are they doing? Use iftop to find out. more>>

An Introduction to GCC Compiler Intrinsics in Vector Processing

Speed is essential in multimedia, graphics and signal processing. Sometimes programmers resort to assembly language to get every last bit of speed out of their machines. GCC offers an intermediate between assembly and standard C that can get you more speed and processor features without having to go all the way to assembly language: compiler intrinsics. more>>

Making Lists in Scribus

You might as well know from the start: Making bulleted or numbered lists in Scribus isn't as easy as in the average word processor. In fact, compared to LibreOffice, Scribus as installed is downright primitive in the way it handles lists. You can pull a script off the Internet to automate to an extent, but chances are you'll have to tweak it before it does exactly what you want. more>>

Interfacing Disparate Systems

When hearing the word interface, most people probably think of a Graphical User Interface or a physical hardware interface (serial, USB). If you dabble in scripting or are a serious developer, you, no doubt, are familiar with the concept of software interfaces as well. more>>

Android Programming with App Inventor

Drag and drop your way to Android programming.

MIT App Inventor, re-released as a beta service (as of March 5, 2012) by the MIT Center for Mobile Learning after taking over the project from Google, is a visual programming language for developing applications for the Android mobile computing platform. more>>

Calculating Day of the Week, Finally

As with many of the challenges we tackle, the latest project has sprawled across more articles than I ever expected when I first received the query from a reader. The question seems reasonably simple: given a month, day number and day of the week, calculate the most recent year that matches those criteria. more>>

Hack and / - Password Cracking with GPUs, Part III: Tune Your Attack

You've built the hardware, installed the software and cracked some passwords. Now find out how to fine-tune your attacks. more>>

Ahead of the Pack: the Pacemaker High-Availability Stack

A high-availability stack serves one purpose: through a redundant setup of two or more nodes, ensure service availability and recover services automatically in case of a problem. Florian Haas explores Pacemaker, the state-of-the-art high-availability stack on Linux. more>>

Seamlessly Extending IRC to Mobile Devices

Internet Relay Chat (IRC) is one of the older real-time communications methods still in active use on the Internet. Due to its popularity, flexibility and cross-platform nature, it still has a very vibrant user base today. more>>

calendar

Calculating Day of the Week

For those of you playing along at home, you'll recall that our intrepid hero is working on a shell script that can tell you the most recent year that a specific date occurred on a specified day of the week—for example, the most recent year when Christmas occurred on a Thursday. more>>

Hack and / - Password Cracking with GPUs, Part II: Get Cracking

Your hardware is ready. Now, let's load up some software and get cracking. more>>

OpenLDAP Everywhere Reloaded, Part I

Directory services is one of the most interesting and crucial parts of computing today. They provide our account management, basic authentication, address books and a back-end repository for the configuration of many other important applications. more>>

Chemistry the Gromacs Way

In this article, I'm diving into chemistry again. Many packages, both commercial and open source, are available to make chemistry calculations at the quantum level. The one I cover here is gromacs (http://www.gromacs.org). It should be available for your distribution via its package manager. more>>

Hack and / - Password Cracking with GPUs, Part I: the Setup

Bitcoin mining is so last year. Put your expensive GPU to use cracking passwords.

When the Bitcoin mining craze hit its peak, I felt the tug to join this new community and make some easy money. I wasn't drawn only by the money; the concepts behind Bitcoin mining intrigued me, in particular the new use of graphics processors (GPUs). With a moderately expensive video card, you could bring in enough money to pay off your initial investment and your electricity bill in a relatively short time. more>>

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