Cooking with Linux - It's About Time!
Time, François...it's all about time. Yes, I'll explain in a bit, but for now, time is running out and our guests will be here shortly. Just make sure the main server is updated against the reference time server. Forget that, mon ami. I'm sure it's accurate, and besides our guests have arrived! To the cellar, immédiatement! Head to the South wing and bring back the 2001 Châteauneuf du Pape, the Guigal we were sampling earlier this evening. I will show our guests to their tables.
Welcome, mes amis to Restaurant Chez Marcel, home of great wine, exquisite Linux and open-source fare and, of course, world-class guests. Please, sit down and make yourselves comfortable. I've sent François to the cellar to bring back tonight's wine selection, and he should be back shortly. You may notice an overabundance of timepieces on your respective desktops, so I'll start with a little movie history, by way of explanation.
I'm going to pretend that some of you are old enough to remember the 1960 George Pal movie version of H.G. Wells' The Time Machine. In the movie, George, the H.G. character, has a room filled with ticking clocks of every kind: cuckoo clocks, grandfather clocks—you name it—no digital clocks though. If you don't remember that, perhaps you remember Robert Zemeckis' 1985's Back to the Future, starring Michael J. Fox. Doc Brown, played by Christopher Lloyd, has his own lab full of ticking clocks. Guess which one takes its inspiration from the other? Take a look at Figure 1, mes amis, and you'll see a Linux desktop version of George's Victorian home or Doc Brown's lab—depending on your video memory.
Some of you may be asking yourself why people would possibly want another clock on their system. After all, both KDE and GNOME have a clock embedded in their panels. Click on the clock, and a nice little calendar pops up, as in my desktop screenshot (Figure 1). Clocks are cool though, and some are more cool than others. On today's menu, I have several clocks for your enjoyment. From the super-stylish to the decidedly strange, you are bound to find something you like. Here is something you will definitely like and perhaps even love. My faithful waiter has just returned with the wine. Please pour for our guests, François.
While François pours the wine, I want you to take one more look at the clock in the lower right-hand corner of my KDE kicker panel. That's not the default KDE clock, but Fred Schättgen's StyleClock, a themeable replacement that includes an alarm clock and a countdown timer (your chef has used it to take little naps at his chair).
From the menu, you can set an alarm or a countdown timer. Both modes come with some one-click presets, but both the alarm and timer allow for a custom setting. Of course, we also can select themes for that special visual touch. I happen to like the analog styles, but StyleClock comes with both analog and digital themes. There's also the mandatory, super-geeky, binary clock.
Speaking of binary clocks, if you've been reading this column for a long time, you know that although I tend to run a KDE desktop, I still have an enduring fondness for Window Maker and its trademark dock apps. It is for this reason that I now direct your attention to Thomas “Engerim” Kuiper and Sune Fjod's wmBinClock. This slick little Window Maker dock app can display the time vertically or horizontally (horizontal is the default). You read the time by doing binary translation of LEDs that are either on (1) or off (0). When reading the time horizontally, the seconds are the two vertical rows of LEDs on the right. The two middle LEDs are minutes and so on. This is a great little application, and no, you don't need Window Maker to run it. It works just as well under KDE or GNOME.
Maybe you aren't running a graphical display, or you have a fondness for running things in a terminal window, but you would still like a binary clock. Nico Golde's BinClock displays the time in a terminal window. By default, the time is displayed similarly to wmBinClock (Figure 3), but this is a one-time display. To run the clock continuously, you must use the -l option to loop:
Use the -h option to see a number of command-line options that let you run the clock in a single-line or traditional mode or change the color of the ones and zeros. Of course, if you want to do straight text, you simply could type the date command in your terminal window. If you want a calendar for the current month, type cal. I do, however, want to focus on the desktop.
Practical Task Scheduling Deployment
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.
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- Stunnel Security for Oracle
- The Firebird Project's Firebird Relational Database
- SUSE LLC's SUSE Manager
- Murat Yener and Onur Dundar's Expert Android Studio (Wrox)
- Managing Linux Using Puppet
- My +1 Sword of Productivity
- Non-Linux FOSS: Caffeine!
- Google's SwiftShader Released
- SuperTuxKart 0.9.2 Released
- Doing for User Space What We Did for Kernel Space
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