GUI Scripting with Tcl/Tk
Tcl/Tk is the oldest of the GUI-enabled scripting languages in common use today, but it doesn't enjoy the monopoly position it used to have. Python, coupled with GTK or Qt, now provides a more contemporary solution to many of the problems for which Tcl/Tk used to be the natural choice. Both Tcl/Tk and Visual Tcl have some ground to make up in terms of looks, features and desktop integration. Yet, the simplicity of application development offered by the mature and superbly integrated combination of the Tcl language and the Tk toolkit still is second to none. If you have a simple scripting task that would benefit from a GUI, where speed and cost of development are important, Tcl/Tk still should be near the top of the list of contenders for the job.
ActiveState Tcl Web Site: www.activestate.com/Products/ActiveTcl
Incr Tcl: incrtcl.sourceforge.net/itcl
Practical Programming in Tcl and Tk, 4th edition, by Brent Welch. Prentice-Hall PTR: www.beedub.com/book
The 11 Rules of the Tcl Syntax: www.tcl.tk/man/tcl8.4/TclCmd/Tcl.htm
Source for the Script Developed in This Article: ftp.linuxjournal.com/pub/lj/listings/issue119/7225.tgz
The Tcler's Wiki: mini.net/tcl
Tcl/Tk Headquarters: www.tcl.tk
Tcl/Tk man Pages, On-line and Downloadable: www.tcl.tk/man
Visual Tcl: vtcl.sourceforge.net
XSLT for libxml2: www.xmlsoft.org/XSLT.html
Derek Fountain is a freelance software developer, specializing in UNIX and Linux. He strongly believes in the adage of “make it as simple as possible, but no simpler”. That's why he deploys scripting solutions wherever possible. He lives in Perth, Western Australia.
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.
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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