Archive for ‘Linux’ Category

Fix Ctrl-Alt-Backspace problem with Ubuntu 9.10+

datePosted on 13:58, October 31st, 2009 by Many Ayromlou

Downloaded and installed 9.10 yesterday and what do you know, someone decided to take away Ctrl-Alt-Backspace — or what I call “Three Finger Salute for Linux”. Whhhaaattt!!!!

How the heck are you supposed to kill and restart X without that…..A coworker suggested Alt-PrintScreen-K, but that just restarts GDM, not really useful when X decides to go south. Damit!!
The reason given on Ubuntu wiki is that “This is due to the fact that DontZap is no longer an option in the X server and has become an option in XKB instead.”
Well, fear not, whoever disabled it also created a easy way to reenable it again. Here is what you do:
  • In Gnome (Ubuntu):

    * Get to the System-Preferences-Keyboard menu.
Read the rest

gksudo: Or how this old dog learned new tricks :-)

datePosted on 12:19, September 28th, 2009 by Many Ayromlou

Okay if you know about gksudo, fine. I just found out about it a little while back when I was trying to run ethereal. You see under Ubuntu (and a lot of other Linux distros) the concept of root user has been removed. There is no root (well there is, but you can’t access it), unless you specifically modify your system to activate it. That’s fine (most of the time), since you can use sudo to accomplish almost anything as the administrator. One thing that doesn’t work properly are the graphical applications that need root access. So here is where gksudo comes to rescue. In the case of ethereal I would issue the following command to get it to prompt me for sudo and run as root user:
gksudo ethereal
So next time you get tempted to open up that root account on your Ubuntu install, don’t, use gksudo and get those gui apps running as root.… Read the rest

How to change the default command line text editor in Ubuntu….

datePosted on 12:10, September 28th, 2009 by Many Ayromlou

I love Ubuntu, but there is one thing that really bugs the hell out of me. The default configured editor in Ubuntu is nano, a Pico clone. I hate Pico, therefor I hate nano :-). So how would you go about fixing this and changing the default editor to vi (or vim):

  1. Issue the following command: sudo update-alternatives --config editor
  2. Enter the superuser password when prompted.
  3. At the following screen choose the number beside the editor you want as default or alternatively just press Enter to keep the default the same.
    There are 3 alternatives which provide `editor'.

    Selection Alternative
    -----------------------------------------------
    1 /usr/bin/vim.tiny
    2 /bin/ed
    *+ 3 /bin/nano

    Press enter to keep the default[*], or type selection number: 1
    Using '/usr/bin/vim.tiny' to provide 'editor'.
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Title says it all…..head over to TechPosters (kinda slow right now) and snag your favourite cheat sheet/reference card. There are also more of this kinda stuff over at Cheat-Sheets.org as well.

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Apertus: Open Source DCinema……

datePosted on 16:22, August 7th, 2009 by Many Ayromlou

Yep, those crazy open source hackers over at dvinfo.net have done it again. You thought the RED camera brought about a revolution in dcinema, well, you ain’t seen nothing yet. Apertus is using the Elphel 353, free software and open hardware camera. The Elphel Camera which this entire project is based on is basically an excellent security camera that can do some real magic. The camera uses an Aptina CMOS bayer-pattern sensor with an optical format of 1/2.5″ (5.70mm x 4.28mm) and a native resolution of 2592×1944 (5 Megapixels). It features a 12 bit ADC and supports: region of interest, on-chip binning and decimation. Aptina claims that the chip has 70db of dynamic range at full resolution and 76db when using 2×2 binning.… Read the rest

So after yesterdays rant, I went back and figured out how to install the Cacti monitoring software (OSS, Free) onto a Ubuntu 9.04 “Jaunty Jackalope” Desktop installation. This guide uses packages only, no compiling, no Makefiles or anything like that…..You should be able to just follow this and get a fully functioning Cacti installation in about 30 minutes. Here are the steps:

  1. install ubuntu 9.04 (“Jaunty Jackalope“) Desktop Edition on your machine
  2. Login, open a Shell window and install ubuntu LAMP (Linux/Apache/MySQL/PHP) server stack on your machine
    “sudo tasksel install lamp-server”.
    Note: Make sure you remember the password for “root” user in mysql Database, write it down somewhere, we will need it later on.
  3. Get a superuser shell started since it will make for less typing.
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I was looking for a fast small (read: mini-ITX) mobo that had enough power to drive 1080P monitor/panel and I came across Zotac IonITX-A-U board. According to manufacturer’s website:

The mini-ITX form factor ZOTAC® ION combines a high-performance NVIDIA® ION graphics processor with a power-efficient Intel® Atom processor for the ultimate eco-friendly platform that has no troubles handling regular web browsing, e-mail, & productivity and HD video playback tasks.

NVIDIA® PureVideo HD technology harnesses the power of the ION’s 16 high-speed stream processors for high-definition Blu-ray playback capabilities. PureVideo HD technology decodes HD video formats and enhances standard-definition videos with the ION GPU for flawless HD and superior SD video playback.

Sounds and looks very nice and capable. I guess I’d have to pick one up and give it a whirl.… Read the rest

Beagleboard is your friend…..

datePosted on 16:52, May 24th, 2009 by Many Ayromlou

The USB-powered Beagle Board is a low-cost, fan-less single board computer utilizing Texas Instruments’ OMAP3530 application processor that unleashes laptop-like performance and expansion without the bulk, expense, or noise of typical desktop machines.

Beagle Board is based on an OMAP3530 application processor featuring an ARM® Cortex™-A8 running at up to 600MHz and delivering over 1,200 Dhrystone MIPS of performance via superscalar operation with highly accurate branch prediction and 256KB of L2 cache. Focal to Beagle Board experience is the high-speed USB 2.0 on-the-go (OTG) port that can be utilized to provide power to the board or to deliver highly flexible expansion. Standard PC peripherals can be connected to Beagle Board using the USB with a mini-A to standard-A cable adapter, DVI-D using an HDMI to DVI-D adapter, or through the MMC/SD/SDIO connector enabling a complete desktop experience.… Read the rest

Could this be the Google Tablet…..

datePosted on 16:25, May 24th, 2009 by Many Ayromlou

Not too sure, but the Zoom OMAP34x-II Mobile Development Platform looks too “finished/flashy” to be a Mobile Development Platform (MDP). I guess time will tell……For now we can all drool over the pics….and btw, if you have $1150, you can beat the crowd and own one today.

Out of the box features of the Zoom OMAP34x-II MDP :

  • 4.1″ WVGA multi-touch display with a QWERTY keypad in a landscape, handheld form factor
  • High performance OMAP3430 applications processor that supports up to 720p HD video encode/decode
  • Support for popular leading mobile operating systems, including Android Mobile Platform, Linux, LiMo, Symbian OS and Microsoft(r) Windows(r) Mobile
  • Wireless connectivity technology from TI, including WiLinkTM 6.0 (WL1271), a single chip with Wi-Fi(r), Bluetooth(r) and FM functionality; and NaviLinkTM GPS functionality
  • 8-megapixel camera sensor
  • Optional 3G modem solution, as well as flexibility to support any third party modem through an extension card
  • An optional DLP Pico projection module will be available, taking mobile content from “tiny screen” viewing to a shareable “big screen” format
The DLP Pico projector is a interesting critter.… Read the rest

Surveyor SRV-1 Blackfin Robot

datePosted on 15:51, May 24th, 2009 by Many Ayromlou

Wow, this little guy is cool. Check out Surveyor Corporation’s Open Source Wireless Mobile Robot . Very neat little package for just $475. While there, you might also want to check out YARB 1.0 (Yet Another Robotic Blimp) robot, also pretty neat. Here is a bit of a description according to their site:

Designed for research, education, and exploration, Surveyor’s SRV-1 internet-controlled robot integrates a 1000MIPS 500MHz Analog Devices Blackfin BF537 processor, a digital video camera with resolution from 160×128 to 1280×1024 pixels, laser pointer ranging, and WLAN 802.11b/g networking on a quad-motor tracked mobile robotic base.

Operating as a remotely-controlled webcam or a self-navigating autonomous robot, the SRV-1 can run onboard interpreted C programs or user-modified firmware, or be remotely managed from a Windows, Mac OS/X or Linux base station with Python or Java-based console software.… Read the rest

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