Best of Technical Support
Is it possible to run my Red Hat 8.0 system without a network card?
Sure, it's possible, and you don't have to do anything. Any normal
Linux system configures lo (the loopback interface) automatically.
It's even possible to run without that (as embedded Linux systems
sometimes do). However, you shouldn't have to do anything special.
Simply install your distribution and refrain from entering any
I recently used Konqueror 2.2.2 to visit a credit-card Web site (URL
withheld to protect the guilty) to check my account. The site said I
needed to upgrade to at least Netscape 4.0 or Microsoft Internet Explorer
4.0 in order to use the 128-bit-strong encryption their site used.
I know that Konqueror 2.2.2 is a much later version than 4.0 of either of
the browsers they mentioned. I checked the various browser settings,
and sure enough, SSL2 and 3 both were enabled, with encryptions going
as high as 168 bits. Almost every encryption standard was enabled
in my settings; the exceptions being FZA-FZA-CBC-SHA, FZA-NULL-SHA,
NULL-MD5 and NULL-SHA—they all say “0 of 0 bits”. Finally, I changed the user agent setting to broadcast that it was
Netscape or MSIE, and magically, I stopped getting the error messages.
Now when I fill in the forms, such as the login screen, my input is
and cookies. Nothing works. Am I doing something wrong or is the site nonstandard? If
I look in my settings under certificates, it says I have a
certificate from the Web site. I can verify that certificate, but it
does not say what type of encryption they use or give me any other useful
I'll bet the Web site uses the user agent string to help identify what it
thinks is a valid browser version.
Mozilla. If that doesn't work complain to the Web site.
Too many Web developers code to a particular
implementation (target platform) rather than to
the standard protocols and APIs (application
programming interfaces). This is exacerbated
several different Web browsers is daunting.
I encourage all Web site developers to start
with the simplest implementation of the
core requirements. Add bells and whistles in
core functions without it.
My suggestions: complain to your bank and try using Mozilla 1.x or
There is a silver lining, however. You may not
be aware of this, but the default Apple browser,
Safari, is based on the KHTML rendering engine
from the KDE Project. This, obviously, is the same
engine that Konqueror uses. Also, now that Microsoft discontinued
development on the Macintosh version of Internet
Explorer, Web developers who
code for Windows and Mac only will be coding
for you too.
I am using an ASUS motherboard. Under Microsoft Windows 98, a program called
asusprobe reports that the CPU temperature is about 47°C/116°F and the
motherboard temperature is about 31°C/87°F. These may change slightly but
are pretty steady. How do I find these temperatures under Linux?
Most commodity motherboards that provide this information are built
around the LM78 series of chips that communicate over the i2c 2-wire
bus. The SMBus is a particular implementation of i2c. The drivers and
utilities for accessing this information under Linux are in the
lm-sensors package. You can learn more about that project from
The i2c and lm-sensors drivers are included with mainstream kernel sources
and are compiled into all mainstream Linux distributions like Red Hat,
Debian and SuSE. Perusing the FAQ reveals that different motherboards report differing
numbers for temperature and voltage; you can adjust those settings
by editing the /etc/sensors.conf file. Debian installed a sample
sensors.conf file that's about 20 pages long.
Also, the FAQ specifically mentions ASUS P2B
motherboards in relation to odd temperature readings—if that's
your motherboard, read the FAQ at the above URL.
Incidentally, a number of packages use this lm-sensors
interface, dæmons that store histories of readings for statistical
analysis and graphing, GUI widgets that run in KDE, GNOME or Window
Maker panels and so on. At the very least you probably should use the sensors
command that will read the settings from your /etc/sensors.conf to
adjust the raw readings it gets from the drivers.
Suppose there's a site called www.foo.org/technical/pics.
How can I download only the pictures—let's say
the only extension is .jpg—from a Web site using
Here's an example:
wget -r -l1 --no-parent -A "*.jpg" \ http://www.server.com/dir/
This recursively (-r) downloads all the *.jpg files from the dir
directory on the www.server.com Web server up to one level depth.
Do a man wget for more of this great utility's
Felipe Barousse Boué
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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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