Current_Issue.tar.gz - Snug as a Bug in a Beagle Board
Here at Linux Journal, we take Linux very seriously. In fact, even my kids are embedded. No really, I tucked them in about 20 minutes ago. They're almost asleep. (See, every month you think Shawn can't possibly have another cheesy issue-focus-related joke.) Seriously though, when it comes to Linux, the biggest area of growth is in the tiniest of spaces—the embedded market. It sort of reminds me of a B spy movie:
Linux quietly takes over more and more devices; then one day Bill Gates wakes up in a hospital room.
Mr Gates: What happened, did the surgery go wrong? Did my pacemaker quit working?
Nurse: No Mr Gates, it's working just fine. Your pacemaker is running Linux...
Mr Gates: Nooooooooo!!!!!!
Okay, perhaps I should stick to editorials and not try my hand at writing movie scripts. With or without my movie, however, Linux really does dominate the embedded market. This month, we've got a wide variety of articles to help you learn more about developing for such markets or to introduce you to embedded Linux for the first time.
What better way to attract everyone's interest than with a remote-controlled rover? Kevin Sikorski tells us all about the Player Project. It's a software framework for interfacing with PC-based robots. For most of us, sending up missions like the Mars Rovers might be a bit much. However, after reading Kevin's article, a “Backyard Rover” might be possible—or at the very least, a robot that could find and fetch missing left socks from the laundry room. If you're not quite up to such a daunting task and would like to learn a little more about how embedded Linux systems actually work, you might want to read Johan Thelin's article first. It introduces the concepts and functions of embedded systems—possibly a primer course for your robot-building adventure.
If robots were the only type of embedded projects that ran Linux, it would be rough to devote an entire issue to it. The beauty of embedded Linux is that it can be so diverse. For instance, David Rowe shows us the Mesh Potato. It may seem like a simple wireless access point, but thanks to the operating system underneath, it's a lot more. This month, even Kyle Rankin is trying to embed Linux—onto his face, in fact. Check out his review of the Vuzix video goggles and see if they make him more awesome or more likely to be kidnapped by Romulans.
Don't worry if embedded Linux doesn't really tickle your fancy. Dirk Elmendorf shows us the Beagle Board this month. It's a full-blown computer system that you probably could fit in your wallet. Granted, it would make interacting with it difficult, and it likely wouldn't survive too many sit-downs, but because the Beagle Board is so tiny, hiding it in places a little more useful should be simple.
We have lots of non-embedded material for you this month too. Whether you want to run multiple operating systems from the convenience of a thin client (Jorge Salgado shows you how) or check your e-mail every minute of every day (Kyle Rankin explains a method you've probably never seen before), this month should satisfy. Plus, we've got book reviews from Reuven M. Lerner, shell scripting longitude and latitude from Dave Taylor and lots of new products from James Gray.
So make some chamomile tea, turn down the thermostat (possibly with the help of Jeffery Ramsey's article on controlling room humidity with an embedded system), and grab this month's issue of Linux Journal. Carefully crawl into bed and embed yourself under the covers. Enjoy an exciting month of projects and read well into the morning. If you have a hard time booting up in the morning, Christopher Hallinan's article on reducing boot time in embedded systems might help. Or, call in sick with your cell phone. It might just be running embedded Linux too.
Shawn Powers is the Associate Editor for Linux Journal. He's also the Gadget Guy for LinuxJournal.com, and he has an interesting collection of vintage Garfield coffee mugs. Don't let his silly hairdo fool you, he's a pretty ordinary guy and can be reached via e-mail at firstname.lastname@example.org. Or, swing by the #linuxjournal IRC channel on Freenode.net.
Practical Task Scheduling Deployment
July 20, 2016 12:00 pm CDT
One of the best things about the UNIX environment (aside from being stable and efficient) is the vast array of software tools available to help you do your job. Traditionally, a UNIX tool does only one thing, but does that one thing very well. For example, grep is very easy to use and can search vast amounts of data quickly. The find tool can find a particular file or files based on all kinds of criteria. It's pretty easy to string these tools together to build even more powerful tools, such as a tool that finds all of the .log files in the /home directory and searches each one for a particular entry. This erector-set mentality allows UNIX system administrators to seem to always have the right tool for the job.
Cron traditionally has been considered another such a tool for job scheduling, but is it enough? This webinar considers that very question. The first part builds on a previous Geek Guide, Beyond Cron, and briefly describes how to know when it might be time to consider upgrading your job scheduling infrastructure. The second part presents an actual planning and implementation framework.
Join Linux Journal's Mike Diehl and Pat Cameron of Help Systems.
Free to Linux Journal readers.Register Now!
- SUSE LLC's SUSE Manager
- Murat Yener and Onur Dundar's Expert Android Studio (Wrox)
- My +1 Sword of Productivity
- Tech Tip: Really Simple HTTP Server with Python
- Managing Linux Using Puppet
- Non-Linux FOSS: Caffeine!
- Returning Values from Bash Functions
- Rogue Wave Software's Zend Server
- Doing for User Space What We Did for Kernel Space
- Parsing an RSS News Feed with a Bash Script
With all the industry talk about the benefits of Linux on Power and all the performance advantages offered by its open architecture, you may be considering a move in that direction. If you are thinking about analytics, big data and cloud computing, you would be right to evaluate Power. The idea of using commodity x86 hardware and replacing it every three years is an outdated cost model. It doesn’t consider the total cost of ownership, and it doesn’t consider the advantage of real processing power, high-availability and multithreading like a demon.
This ebook takes a look at some of the practical applications of the Linux on Power platform and ways you might bring all the performance power of this open architecture to bear for your organization. There are no smoke and mirrors here—just hard, cold, empirical evidence provided by independent sources. I also consider some innovative ways Linux on Power will be used in the future.Get the Guide