Letters to the Editor
What a pleasure to read Mr. Iacona's introductory treatment of awk in the June issue. I've been exposed to awk in a hard-core UNIX setting (designing SRAM circuit layout for Motorola), but have not used it myself. Now I design textiles on the SGI platform (not so far from chip layout as you might think) and need to manipulate text files. I run LinuxPPC on my PCC PowerCenter 120 Macintosh clone at home to practice UNIX for work. I'll lean on Mr. Iacona's article, his clear, well-commented example code and helpful glossary with confidence. I'm dying to get the O'Reilly books and take on more. A clear, usable, focused treatment of a daunting subject; well-edited, too. Continue to set your standards high.
—Four Hewes firstname.lastname@example.org
The information in this month's Kernel Korner (“IP Bandwidth Management” by Jamal Hadi Salim, June 1999) reminds all of us that there is yet another dimension to the “free-ness” offered to Linux users: not only the code and applications in development, but also Linux ISP's.
These ISPs are affecting our ability to move freely. Why? QoS (Quality of Service) is essentially the end of all-you-can-eat Internet access—no more monthly flat rates. Oh sure, there's the bare-bones rate, but that's bare, bare bones. Instead, the more we are willing to pay, the more our ISP will shove down our lines. What a fair world!
It's a double-whammy. I can remember the good old days (i.e., three years ago) when we criticized telco's for ripping us off (after all, the customer is considered “the last mile”); now, ISP's will also be subject to our scorn (if they're not already), as will the host client/servers (i.e., those Linux boxes we adore so much).
Sure, QoS implementation is not so much a question of “if” but “when” (it's that inevitable, my friend). But my teeth gnash at the thought of this implementation hard-coded into the Linux kernel.
—John K. Joachim Joachimj@usa.net
I've been a subscriber for a few years but still consider myself a newbie. So far, my faltering steps toward ever greater Linux mastery are consistently rewarded by finding out just how rich and robust an OS Linux is. Your magazine really helps; it's great to feel like I'm part of such a community as LJ serves. Thank you and your staff for sweating the little stuff.
—Jamie Matthews email@example.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.
Free to Linux Journal readers.Register Now!
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- 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