Scripting for X Productivity
We explained how the numerical keycodes corresponding to extra keys can be remapped to mean other events, but how does one come to know them in the first place? The solution is the diagnostic tool xev, which opens an Event Tester window and reports in the original terminal everything that happens to that window. On the author's system, pressing the left Windows key returns (notice the keycode value and comments):
KeyRelease event, serial 23, synthetic NO, window ↪0x1000001, root 0x46, subw 0x0, time 1108438536, (175,176), root:(627,425), state 0x40, keycode 115 ↪(keysym 0xffeb, Super_L), same_screen YES, XLookupString gives ↪0 characters: ""
Last but not least, screenshots are necessary to show off your shell script GUIs, aren't they? Even in this case, plain X and ImageMagick suffice, without needing fancier front ends installed. The images for this article all were grabbed and converted to PNG format with the following standard commands, all properly documented in their man pages:
xwd -out temp_image -frame xwdtopnm temp_image > fig1.pnm convert fig1.pnm fig1.png
The first command dumps the window selected with the cursor, frame included, into temp_image, and the second and the third convert that file first to “portable anymap”, then to PNG format. It goes without saying that these three commands may be inserted easily in a shell script that asks, through Xdialog, which to grab (screen or window) and in which file to save the result.
For many users, the standard, full-blown desktop environments have either too many features, which slow the PC down, or too few to fulfill their specific needs. The tools and techniques described here can help users greatly improve their productivity and also can be a lifesaver whenever the same PC is shared by CLI and mouse addicts.
Remote Control of Mozilla: www.mozilla.org/unix/remote.html
xautomation (includes xte): hoopajoo.net/projects/xautomation.html
xmodmap: www.deadman.org/X/xbuttons.html, koala.ilog.fr/colas/mouse-wheel-scroll, www.tldp.org/HOWTO/Keyboard-and-Console-HOWTO-15.html, www.sandklef.com//software/xikbd and www.fedu.uec.ac.jp/ZzzThai/xio
Marco Fioretti is a hardware systems engineer interested in free software both as an EDA platform and (as the current leader of the RULE Project) as an efficient desktop. Marco lives with his family in Rome, Italy.
Articles about Digital Rights and more at http://stop.zona-m.net CV, talks and bio at http://mfioretti.com
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.
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- SourceClear Open
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