Hi-Tech Arena

netstat To list open network ports and the processes that own them on FreeBSD with netstat, you can use this command:   netstat -a | egrep 'Proto|LISTEN' The output for this on my laptop running FreeBSD is: Proto Recv-Q Send-Q  Local Address      Foreign Address    (state) tcp4       0      0  localhost.ipp      *.*                LISTEN tcp6       0      0  localhost.ipp      *.*                LISTEN tcp4       0      0  *.2200             *.*                LISTEN tcp6       0      0  *.2200             *.*                LISTEN tcp4   ...

Get this. You know Google Glass, the futuristic headset that sells for $1,500? According to a new report from TechInsight's Teardown.com, the high-tech headpiece only costs around $80 to produce. The site secured a pair of the pricey specs and then ripped them apart, piece by piece, to determine the estimated price of each component. The surprising finding? Their preliminary analysis revealed that the bill of materials for all the parts and pieces used to make Google Glass adds up to a measly $79.78. The most expensive component used in Glass is the Texas Instruments OMAP 4430 applications processor, which comes in at around $13.96. The display, touch screen, and glass cost just $3, while the battery comes in at $1.14, and the camera is worth $5.66. Non-electrical material used in the device costs $13.63, while the 16GB of NAND flash memory from Toshiba totals $8.18, and assembly and testing comes in at $2.15. Google, meanwhile, says Teardown.com's assessment is n...

For a more detailed analysis of this catastrophic bug, see  this update , which went live about 18 hours after Ars published this initial post. Researchers have discovered an extremely critical defect in the cryptographic software library an estimated two-thirds of Web servers use to identify themselves to end users and prevent the eavesdropping of passwords, banking credentials, and other sensitive data. The warning about the bug in OpenSSL coincided with the  release of version 1.0.1g of the open-source program , which is the default cryptographic library used in the Apache and nginx Web server applications, as well as a wide variety of operating systems and e-mail and instant-messaging clients. The bug, which has resided in production versions of OpenSSL for more than two years, could make it possible for people to recover the private encryption key at the heart of the digital certificates used to authenticate Internet servers and to encrypt data traveling between ...

A medical device, once its job is done, could harmlessly melt away inside a person's body. Or, a military device could collect and send its data and then dissolve away, leaving no trace of an intelligence mission. Or, an environmental sensor could collect climate information, then wash away in the rain. It's a new way of looking at electronics: "You don't expect your cell phone to dissolve someday, right?" said Reza Montazami, an Iowa State University assistant professor of mechanical engineering. "The resistors, capacitors and electronics, you don't expect everything to dissolve in such a manner that there's no trace of it." But Montazami thinks it can happen and is developing the necessary materials. He calls the technology "transient materials" or "transient electronics." The materials are special polymers designed to quickly and completely melt away when a trigger is activated. It's a fairly new field of study...

Newcastle University is trialling new technology to help patients suffering from Parkinson's disease live more independently by reminding them to swallow, speak up and take their medication Google Glass is being used by people suffering from Parkinson’s disease in a groundbreaking experiment to see if the technology can help improve their day-to-day lives. The technology, which is not yet available in Britain, reminds the patients to take their medication, contacts relatives in an emergency and can even prevent debilitating episodes of paralysis – known as ‘freezing.’ The system works like a hands-free smartphone, displaying information on the lens of the Glass. It is voice-operated and linked to the internet. Doctors at Newcastle University have created a programme that helps control behaviour associated with Parkinson's, such as reminding the individual to speak up or to swallow to prevent drooling. “The beauty of this research project is we are desi...

Snoopy  is a distributed tracking and profiling framework to perform some pretty interesting tracking and profiling of mobile users through the use of WiFi. The talk was well received (going on what people said afterwards) by those attending the conference and it was great to see so many others as excited about this as we have been. In addition to the research, we both took a different approach to the presentation itself. A 'no bullet points' approach was decided upon, so the slides themselves won't be that revealing. Using Steve Jobs as our inspiration, we wanted to bring back the fun to technical conferences, and our presentation hopefully represented that. As I type this, I have been reliably informed that the DVD, and subsequent videos of the talk, is being mastered and will be ready shortly. Once we have it, we will update this blog post. In the meantime, below is a description of the project. Background There have been recent initiatives from numerous gover...

Today we will create a small script that will allow us to run one or more commands on multiply Unix/Linux servers .. List of Commands / Tools : SSH :     (SSH client) is a program for logging into a remote machine and for executing commands on a remote machine.  It is intended to replac rlogin and rsh, and provide secure encrypted communications between two untrusted hosts over an insecure network.  X11 connections and   arbitrary TCP ports can also be forwarded over the secure channel.   CAT :    cat reads each file in sequence and writes it on the standard output. FOR :     for will allow us to run in loop until the end of input . ECHO :  echo writes its arguments separated by blanks and terminated by a new-line on the standard output VI :   it's just a text editor CHMOD :  The chmod command changes the permissions of one or more files according to the value of symbolic_mode_list or numeric_m...