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• JavaOne - Java SE Embedded Booth - Pactron Java Programmable Automation Controller (JPAC)

  - by David Clack

  Hi All, So at the last JavaOne we talked about developing a Java powered Programmable Automation Controller (JPAC) with our partner Pactron in Santa Clara. We actually demoed it running first at the Embedded Show in Germany this March. JPAC is based on a Marvell 88F6282 Kirkwood ARM SOC, we partnered with Hilsher from just outside Frankfurt, Germany for the mini pci ProfiBus controllers, Revolution Robotics from Corvallis, Oregon wrote the Java SE Embedded for ARM to Hilscher Linux driver interface. Revolution Robotics also designed the HTML5 application that runs on a Marvell ARM tablet to actually send and receive commands via ProfiBus to a slave device. We will have the system running in our booth at JavaOne this year, come take a look. If you are registered at JavaOne you can come over to the Java Embedded @ JavaOne for $100 Come see us in booth 5605 See you there Dave

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• Problem installing Oracle 10g Express edition

  - by abhi

  I have installed Oracle 10g Express edition in Ubuntu 10.10 and it doesn't show or ask to give my password during installation. When I click on "start database" it gave the warning "Operation failed, abhi is not a member of 'dba' group." and when clink on "Run SQL command line" it shows /usr/lib/oracle/xe/app/oracle/product/10.2.0/server/bin/nls_lang.sh: 114: [[: not found When I click on "GOTO Database home page", it opens Mozilla's "Ubuntu Google search page". Can anyone help me get my Oracle to work or tell me how to remove that because it is also not getting removed. I tried all the commands that are given as suggestions by Ubuntu. Please help me because I don't want to format my Ubuntu.

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• How can I install the Unity Photo Lens

  - by Chuqui

  I can't install the Photo Lens. After running these commands: sudo add-apt-repository ppa:scopes-packagers/ppa sudo apt-get update && sudo apt-get install unity-lens-photo unity-scope-shotwell unity-scope-flickr I get this: Package unity-lens-photo is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package 'unity-lens-photo' has no installation candidate Is there a fix for that? Thank you very much.

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• Should I Leave My Laptop Plugged In All The Time?

  - by Jason Fitzpatrick

  Should you leave your laptop plugged in and charging when you’re not on-the-go? What’s best for the battery? What’s best for your user experience? Read on as we investigate. Image available as wallpaper-size download here. Today’s Question & Answer session comes to us courtesy of SuperUser—a subdivision of Stack Exchange, a community-drive grouping of Q&A web sites. 8 Deadly Commands You Should Never Run on Linux 14 Special Google Searches That Show Instant Answers How To Create a Customized Windows 7 Installation Disc With Integrated Updates

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• How to protect Ubuntu from fork bomb

  - by dblang

  I heard someone talking about a fork bomb, I did some research and found some dreadful information about some strange looking characters people can have you type at the command line and as a result do bad things on the computer. I certainly would not issue commands I do not understand but one never knows what can happen. I heard that some OS allows the administrator to place some limit on user processes to mitigate the effects of fork bombs, is this protection in Ubuntu by default or would a person with sudo privilege have to set this? If so, how?

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• ralink rt2860 not working anymore in ubuntu 12.10

  - by greenit

  I just upgraded from Ubuntu 12.04 to 12.10, however, my network card is not working anymore... When i had 12.04 installed, i just had to download the driver from Ralink, go to the directory and enter these commands: $ make $ sudo make install and the network card worked... now, when I want to do this in ubuntu 12.10, it seems like it works, but it doesn't. I can enable the module, it recognizes the network card, but i am unable to connect to any wireless network... How can i get my wireless card working again? If any1 knows a solution, please tell it to me, thx in advance

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• How to create a restricted SSH user for port forwarding?

  - by Lekensteyn

  ændrük suggested a reverse connection for getting an easy SSH connection with someone else (for remote help). For that to work, an additional user is needed to accept the connection. This user needs to be able to forward his port through the server (the server acts as proxy). How do I create a restricted user that can do nothing more than the above described? The new user must not be able to: execute shell commands access files or upload files to the server use the server as proxy (e.g. webproxy) access local services which were otherwise not publicly accessible due to a firewall kill the server Summarized, how do I create a restricted SSH user which is only able to connect to the SSH server without privileges, so I can connect through that connection with his computer?

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• Ubuntu 12.04 LTS Realtek RTL8192E Problems

  - by Logan

  My wifi is not working. I have tried ndiswrapper with the XP driver but that still did not work. Please explain to me in layman's terms. I can run commands so if you tell me exactly what to put, i will put it. Basically, ubuntu is not showing a wireless networks option and when I ran some command yesterday it said the driver was UNCLAIMED. Please help. This is a wintec card with realtek rtl8192E chip on it. It is a desktop computer. On a 20gb partition, other 60gb is for windows(yeah its an old desktop). Use windows installer to install ubuntu(this is one of the dell desktops that wont boot ubuntu from disk). So any help is appreciated and I would like to get this done THIS weekend.

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• Installing latest Firefox beta, am I doing it wrong?

  - by xiaohouzi79

  I followed the instructions in this question to install the latest Firefox beta: sudo add-apt-repository ppa:mozillateam/firefox-next sudo apt-get update && sudo apt-get install firefox-4.0 This is the error I'm getting when running the second set of commands: Err http://ppa.launchpad.net maverick/main Sources 404 Not Found Err http://ppa.launchpad.net maverick/main i386 Packages 404 Not Found Fetched 24.8kB in 4s (5,279B/s) W: Failed to fetch http://ppa.launchpad.net/mozillateam/firefoxt-next/ubuntu/dists/maverick/main/source/Sources.gz 404 Not Found W: Failed to fetch http://ppa.launchpad.net/mozillateam/firefoxt-next/ubuntu/dists/maverick/main/binary-i386/Packages.gz 404 Not Found E: Some index files failed to download, they have been ignored, or old ones used instead.

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• Update: TFS Power Tools March 2011

  - by Enrique Lima

  There is an update available for the TFS Power Tools and the TFS Build Power Tools. Among the updates to the Tools: Changes to the Team Foundation Server Backups Add-In for TFS Admin Console. Added functionality to the Windows Shell Extension. Changes to the tfpt command line tool that allows you to script build management commands. For a full detail of the changes, read Brian Harry’s post  http://blogs.msdn.com/b/bharry/archive/2011/03/03/mar-11-team-foundation-server-power-tools-are-available.aspx To download the Power Tools: Team Foundation Server Power Tools Team Foundation Server Build Extensions Power Tool

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• BlueStacks Joins Forces with AMD; Launches AMD-only Enhanced Android App Launcher

  - by Jason Fitzpatrick

  Last fall we showed you how to run Android apps on your Windows PC with BlueStacks. Now BlueStacks has partnered with AMD to offer even better Android emulation on AMD-powered Windows machines. Check out our original overview and installation guide for BlueStacks to get a feel for what you can do with the app. If you’re sporting an AMD CPU, hit up the link below to check out the AMD AppZone to grab some of the thousands of Android apps you can enjoy on your desktop. AMD AppZone: Android [via Gigaom] 8 Deadly Commands You Should Never Run on Linux 14 Special Google Searches That Show Instant Answers How To Create a Customized Windows 7 Installation Disc With Integrated Updates

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• On Adopting the Mindset of an Enterprise DBA

  Although many of the important tasks a DBA has to perform should be done 'by hand', keying in commands or using SSMS, the canny DBA with a heavy workload will always have an eye to automating routine tasks wherever possible, or using a tool. 24% of devs don’t use database source control – make sure you aren’t one of themVersion control is standard for application code, but databases haven’t caught up. So what steps can you take to put your SQL databases under version control? Why should you start doing it? Read more to find out…

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• sudo & redirect output

  - by Khaled

  I have a small question regarding using sudo with output redirect >. To enable IP forwrding, someone can use the command: $ echo 1 > /proc/sys/net/ipv4/ip_forward Executing this command will give permission denied as it requires root privileges. However, executing the same command with sudo gives also permission denied error! It seems that output redirect > does not inherit the permissions of the preceding command echo. Is this right? As a workaround I do: $ echo 1 | sudo tee /proc/sys/net/ipv4/ip_forward Is this the best way to do it? Am I missing something? Please, note that this is an example and it applies to all commands that use output redirect.

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• How do I set up hosting a domain name at home with Apache?

  - by Andrew McIntyre

  I am relatively new to Ubuntu Linux and I am struggling to figure out the basic set-up of hosting a domain name at home with Apache2. I understand that you have to change your IP from dynamic to a static IP Address but I am not sure how you achieve that step. I am looking for some assistance on this on how to enable self signing certificates, make the domain name resolve on the Internet from hosting the website on the web server, enabling protected directories and the basic commands of accessing the directory where the website files can be uploaded and available on the World Wide Web.

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• How to install Chrome browser properly via command line?

  - by Bad Learner

  Setting up and managing an Ubuntu server all by myself, in coming months, is a part of my current plans. Hence, I am planning a swtich from Windows to Linux - - Ubuntu. I now need to get some grip on the command line, since I am all used to Windows' GUI. Anyway... the most obvious start is installing apps on my computer, and I thought I should learn to do it via CLI. And this is what I did: $ apt-cache search chrome browser the results showed that the proper term is "chrome-browser," so... $ sudo apt-get install chrome-browser And then "Y" for the Y/n question. But the installation threw errors. (I do not have my PC at hand, so can't mention what error exactly.) Does someone see anything wrong with the commands I issued? I am probably missing some command(s) in between, I think.

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• Translating to Bash Command

  - by user3424684

  So for a project for school I had to install the DPJ extension to the Java language. I downloaded and unpacked a tarball containing the files, and then was told to run the following: setenv DPJ_ROOT ${Home}/dpjbin setenv PATH ${PATH}:${DPJ_ROOT}/Implementation/bin How do I do these commands using bash? I know I have to open up the /etc/profile file and add 2 lines (or for the PATH one do I just append something to the top line of the file after a colon?). Any help in how to do this would be appreciated. If it helps I run Ubuntu 14.04 on Virtualbox (and have little to no experience)

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• Find the latest file by modified date

  - by Rich

  If I want to find the latest file (mtime) in a (big) directory containing subdirectories, how would I do it? Lots of posts I've found suggest some variation of ls -lt | head (amusingly, many suggest ls -ltr | tail which is the same but less efficient) which is fine unless you have subdirectories (I do). Then again, you could find . -type f -exec ls -lt \{\} \+ | head which will definitely do the trick for as many files as can be specified by one command, i.e. if you have a big directory, -exec...\+ will issue separate commands; therefore each group will be sorted by ls within itself but not over the total set; the head will therefore pick up the lastest entry of the first batch. Any answers?

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• How to efficiently map tokens to code in a script interpreter?

  - by lithander

  I'm writing an interpreter for a simple scripting language where each line is a complete, executable command. (Like the instructions in assembler) When parsing a line I have to map the requested command to actual code. My current solution looks like this: std::string op, param1, param2; //parse line, identify op, param1, param2 ... //call command specific code if(op == "MOV") ExecuteMov(AsNumber(param1)); else if(op == "ROT") ExecuteRot(AsNumber(param1)); else if(op == "SZE") ExecuteSze(AsNumber(param1)); else if(op == "POS") ExecutePos((AsNumber(param1), AsNumber(param2)); else if(op == "DIR") ExecuteDir((AsNumber(param1), AsNumber(param2)); else if(op == "SET") ExecuteSet(param1, AsNumber(param2)); else if(op == "EVL") ... The more commands are supported the more string comparisions I'll have to do to identify and call the associated method. Can you point me to a more efficient implementation in the described scenario?

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• Integrating Drools with JBossESB

  - by El Guapo

  In recent weeks I've been researching Drools amongst other CEP/Rule Engines and I believe I would like to use Drools. I also have an JBossESB which is responsible for routing of messages between different services. Unless I am totally missing the boat, I can't for the life of me see how I would get data into Drools via JBossESB. Inside of my ESB I have data (facts) that needs to be monitored and routed correctly (some of the data properties also needs to be modified based on other properties in each of the facts, I figured using Drools (a combination of Fusion and Expert) would be the best way to handle this, however, I don't really see in any of the JBoss (or other) documentation how I would get that done. Is this a cart-before-the-horse situation? Am I totally missing the boat somewhere? Any help is greatly appreciated. Thanks.

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• How do i clean up my harddrive?

  - by acidzombie24

  Not to long ago i was using only 35% of my HD. Just recently it shot up to 54% and my diskspace is 16gb so thats more then 3gigs that have been taken. From what i remember i failed to build mysql, i install gitolite which required me to build git from source which had a tons of dependencies (i think it was for building docs, i think i saw latex and other packages but i was drozy when i was installing). I suspect that is what is taking the diskspace. Anyways so far i deleted source folders i know i had and ran these commands. What else can i do? (3gigs is mighty) sudo apt-get autoclean sudo deborphan | xargs sudo apt-get -y remove --purge

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• 'module' object has no attribute 'PY2'

  - by ManikandanV

  I am using ubuntu 14.04, was trying to install python-memcache. I have got an error like Downloading/unpacking python-memcached Downloading python-memcached-1.53.tar.gz Cleaning up... Exception: Traceback (most recent call last): File "/usr/lib/python2.7/dist-packages/pip/basecommand.py", line 122, in main status = self.run(options, args) File "/usr/lib/python2.7/dist-packages/pip/commands/install.py", line 278, in run requirement_set.prepare_files(finder, force_root_egg_info=self.bundle, bundle=self.bundle) File "/usr/lib/python2.7/dist-packages/pip/req.py", line 1229, in prepare_files req_to_install.run_egg_info() File "/usr/lib/python2.7/dist-packages/pip/req.py", line 292, in run_egg_info logger.notify('Running setup.py (path:%s) egg_info for package %s' % (self.setup_py, self.name)) File "/usr/lib/python2.7/dist-packages/pip/req.py", line 284, in setup_py if six.PY2 and isinstance(setup_py, six.text_type): AttributeError: 'module' object has no attribute 'PY2' Storing debug log for failure in /home/mani/.pip/pip.log I am getting the same error when installing Django-celery, pymongo etc

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• Games for the Brain [Brain Teasers Game Site]

  - by Asian Angel

  Are you looking for a great collection of fun games to play at work or home? Then the ‘Games for the Brain’ website is definitely worth bookmarking in your favorite browser! This terrific collection of brain teasers is the perfect way to relax, have fun, and each one only take a few minutes to complete (if you are pressed for time). Games for the Brain Game Homepage [via StumbleUpon] 8 Deadly Commands You Should Never Run on Linux 14 Special Google Searches That Show Instant Answers How To Create a Customized Windows 7 Installation Disc With Integrated Updates

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• Home Pages in ASP.NET MVC

  - by Maxim Z.

  I'm trying out ASP.NET MVC, but, after reading a huge tutorial, I'm slightly confused. I understand how Controllers have Actions that URLs are routed to, but how do home pages work? Is the home page its own controller (e.g. "Home") that has no actions? This sounds correct, but how is it functionality implemented without Actions (no Actions means no methods that call the View Engine)? In other words, my question is this: how are home pages implemented (in terms of Controllers and Views)? Could you please provide sample code?

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• Is it possible to power up ports on a USB hub from Ubuntu?

  - by James Henstridge

  I have a D-Link DUB-H7 powered USB 2.0 hub connected to my computer. Occasionally when I reboot the system, I've noticed that some of the ports on the hub get powered down: the green light next to the port is turned off, and the device attached to that port is not visible to lsusb or similar commands. Devices attached to the other ports on the hub function as normal. I am able to restore the ports by disconnecting power to the hub temporarily (from the computer, AC adapter and any devices that might provide any power such as my phone), but this is a bit of a hassle. It seems like something that might be related to power management, so is there some way you can tell the USB hub to power up through software?

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• After executing a command in the terminal, I sometimes can't execute another

  - by jreed121

  First off sorry for the noob question, I'm sure it's been asked before but I have no idea how to phrase it eloquently... Sometimes when I open/run/execute (unsure of proper term) an application (?lol) from the terminal like geany ie: geany filename.php or maybe run a node.js script: node server.js The command will execute fine, but I'm then left without the ability to execute any other commands unless I open another terminal. my root@pcname:~$ is gone and when I try typing in something else and hitting Enter it just breaks to the next line. I've noticed that sometimes I can hit CTRL+D and it'll give me my prompt back (sorry is prompt even the right name for it?) So could someone please explain why this is happening and how I can get back to the prompt without opening another terminal. Thanks, and sorry again for my noobery.

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