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Android Candy: Intercoms

Linux Journal - Thu, 04/23/2015 - 15:49

Ever since my "tiny $20 tablet" project (see my Open-Source Classroom column in the March 2015 issue), I've been looking for more and more cool things to do with cheap Android devices. more>>

Categories: Linux News

"No Reboot" Kernel Patching - And Why You Should Care

Linux Journal - Wed, 04/22/2015 - 14:21

As Linux version 4.0 was released on 15 April, one of the most discussed new features to be included in this release is "no reboot" kernel patching. more>>

Categories: Linux News

Return of the Mac

Linux Journal - Mon, 04/20/2015 - 16:00

In a previous article, I talked about vim macro basics. In that article, I described how to record a custom macro, assign it to a key and then use it to make automated edits to a BIND zone. I also teased that I would cover more advanced uses of macros, like nested macros, in a future issue. more>>

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DevOps: Better Than the Sum of Its Parts

Linux Journal - Mon, 04/20/2015 - 13:41

Most of us longtime system administrators get a little nervous when people start talking about DevOps. It's an IT topic surrounded by a lot of mystery and confusion, much like the term "Cloud Computing" was a few years back. Thankfully, DevOps isn't something sysadmins need to fear. more>>

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Play for Me, Jarvis

Linux Journal - Thu, 04/16/2015 - 12:07

Elon Musk is known to be particularly apprehensive about artificial intelligence. Although many of us are both excited and worried about the potential future of AI, most don't need to fear computers taking over in the creative realms of society.

Or do we? more>>

Categories: Linux News

Drupageddon: SQL Injection, Database Abstraction and Hundreds of Thousands of Web Sites

Linux Journal - Wed, 04/15/2015 - 13:27

Drupal is a very widely used open-source content management system. It initially was released in 2001, and recent statistics show Drupal as the third-most popular content management system, with just less than 800,000 Web sites utilizing Drupal as a content management system. more>>

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Non-Linux FOSS: .NET?

Linux Journal - Mon, 04/13/2015 - 13:58

No, really! While on a normal day, the word "Microsoft" can be used as an antonym for "Open", the world of .NET seems to be going legitimately open source. more>>

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JavaScript All the Way Down

Linux Journal - Thu, 04/09/2015 - 12:41

There is a well known story about a scientist who gave a talk about the Earth and its place in the solar system. more>>

Categories: Linux News

Designing Foils with XFLR5

Linux Journal - Wed, 04/08/2015 - 11:54

For any object moving through a fluid, forces are applied to the object as the fluid moves around it. A fluid can be something like water, or even something like the air around us. When the object is specifically designed to maximize the forces that the fluid can apply, you can designate these designs as airfoils. A more common name that most people would use is a wing. more>>

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diff -u: What's New in Kernel Development

Linux Journal - Tue, 04/07/2015 - 11:21

Recently there was some discussion about ways to ease the tired backs of kernel maintainers. Apparently the merge windows are times of great labor, and some folks wanted to alert contributors to some preferable code submission habits. more>>

Categories: Linux News

Here, Have Some Money...

Linux Journal - Mon, 04/06/2015 - 16:29

I love Bitcoin. It's not a secret; I've written about Bitcoin mining and cryptocurrency in the past. I'm the first to admit, however, that we're at the very beginning of the cryptocurrency age. more>>

Categories: Linux News

Consent That Goes Both Ways

Linux Journal - Thu, 04/02/2015 - 11:48

Whatever your opinions about Do Not Track, set them aside for a minute and just look at what the words say and who says them. Individuals—the people we call "users" (you know, like with drugs)—are the ones saying it. In grammatical terms, "do not track" is spoken in the first person. more>>

Categories: Linux News

New GeekGuide: Beyond Cron

Linux Journal - Thu, 04/02/2015 - 11:45
How to Know When You've Outgrown Cron Scheduling--and What to Do Next

If you've spent any time around UNIX, you've no doubt learned to use and appreciate cron, the ubiquitous job scheduler that comes with almost every version of UNIX that exists. Cron is simple and easy to use, and most important, it just works. more>>

Categories: Linux News

April 2015 Issue of Linux Journal: High-Performance Computing

Linux Journal - Wed, 04/01/2015 - 10:43
High Performance: a Relative Term

My Pebble watch has several orders of magnitude more power than the mainframe computers used by NASA to land astronauts on the moon an more>>

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April 2015 Video Preview

Linux Journal - Wed, 04/01/2015 - 10:31
Categories: Linux News

Not So Dynamic Updates

Linux Journal - Mon, 03/30/2015 - 11:33

Typically when a network is under my control, I like my servers to have static IPs. Whether the IPs are truly static (hard-coded into network configuration files on the host) or whether I configure a DHCP server to make static assignments, it's far more convenient when you know a server always will have the same IP. more>>

Categories: Linux News

Users, Permissions and Multitenant Sites

Linux Journal - Thu, 03/26/2015 - 12:28

In my last article, I started to look at multitenant Web applications. These are applications that run a single time, but that can be retrieved via a variety of hostnames. more>>

Categories: Linux News

New Products

Linux Journal - Tue, 03/24/2015 - 13:13
Please send information about releases of Linux-related products to newproducts@linuxjournal.com or New Products c/o Linux Journal, PO Box 980985, Houston, TX 77098. Submissions are edited for length and content.
Categories: Linux News

Flexible Access Control with Squid Proxy

Linux Journal - Mon, 03/23/2015 - 15:10

Large enterprises and nuclear laboratories aren't the only organizations that need an Internet access policy and a means of enforcing it. My household has an Internet access policy, and the technique I've used to enforce it is applicable to almost any organization. In our case, I'm not too concerned about outside security threats. more>>

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Solving ODEs on Linux

Linux Journal - Thu, 03/19/2015 - 12:28

Many problems in science and engineering are modeled through ordinary differential equations (ODEs). An ODE is an equation that contains a function of one independent variable and its derivatives. more>>

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