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• Programming Challenges for a beginner

  - by JMK

  I'm in an unusual situation. A colleague of mine wants to "learn programming" and, being a developer I have been tasked with teaching him "programming". Personally, I am self taught, and have never taught any sort of skill to anybody else before so I am not quite sure where to start. Also, I still have a heck of a lot to learn myself (although don't we all)! I write in C# but is C# a good language for a beginner? I was thinking that Visual Basic .Net would be a better starting point, so was considering getting him setup with Visual Studio Express 2010, teaching him a few basics (variables, functions, classes etc) then finding some programming challenges and asking him to work through these. Does anybody have a good source of these sorts of challenges? Also is this a good strategy? Finally, what are your experiences of teaching programming to somebody else and what advice would you give?

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• OpenJDK 6 B27 Available

  - by user9158633

  On October 26, 2012 the source bundle for OpenJDK 6 b27 was published at http://download.java.net/openjdk/jdk6/. The main changes in b27 are the latest round of security updates and a number of other fixes. For more information see the detailed list of all the changes in OpenJDK 6 B27. Test Results: All the jdk regression tests run with  make test passed on linux_i586 cd jdk6 make make test Note: sun/tools/jinfo/Basic.sh test failed on linux_x64. For the current list of excluded tests see  jdk6/jdk/test/ProblemList.txt file:  ProblemList.html in B27 |  Latest ProblemList.txt (in the tip revision). Special thanks to Kelly O'Hair for his contributions to the project and Dave Katleman for his Release Engineering work.

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• XRegExp Regular Expression Library for JavaScript

  - by Jan Goyvaerts

  XRegExp is an open source JavaScript library. It extends JavaScript’s regex syntax with features such as free-spacing, named capture, mode modifiers, and Unicode categories, blocks, and scripts. It also provides its own test(), exec(), forEach(), replace(), and split() methods that eliminate most cross-browser inconstencies and bugs. Anyone using non-trivial regexes in their JavaScript code should seriously consider using XRegExp. Last month’s update of the Regular-Expressions.info website added full coverage of XRegExp to the regex tutorial and regex reference sections. But the tools & languages section was missing the XRegExp page, resulting in broken links in the tutorial and reference sections. This page has now been added.

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• How to document and teach others "optimized beyond recognition" computationally intensive code?

  - by rwong

  Occasionally there is the 1% of code that is computationally intensive enough that needs the heaviest kind of low-level optimization. Examples are video processing, image processing, and all kinds of signal processing, in general. The goals are to document, and to teach the optimization techniques, so that the code does not become unmaintainable and prone to removal by newer developers. (*) (*) Notwithstanding the possibility that the particular optimization is completely useless in some unforeseeable future CPUs, such that the code will be deleted anyway. Considering that software offerings (commercial or open-source) retain their competitive advantage by having the fastest code and making use of the newest CPU architecture, software writers often need to tweak their code to make it run faster while getting the same output for a certain task, whlist tolerating a small amount of rounding errors. Typically, a software writer can keep many versions of a function as a documentation of each optimization / algorithm rewrite that takes place. How does one make these versions available for others to study their optimization techniques?

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• "Dans 5 ans, softwares et hardware seront gratuits", prédit la Fondation Linux

  "Dans 5 ans, softwares et hardware seront gratuits", prédit la Fondation Linux De nouvelles informations sur l'évolution économique de Linux ont été annoncées. Les dernières tendances macro-économiques auraient joué en sa faveur, en allant dans le sens de l'open source. Linux est en effet gratuit, et, de plus, moins coûteux à faire tourner par rapport aux plateformes propriétaires ; que ce soit pour les particuliers ou pour les fabriquants d'ordinateurs. Et même, Google serait-elle la compagnie qu'elle est aujourd'hui si elle n'avait utilisé que des technologies propriétaires comme Microsoft.NET ? Chez Linux, on répond que c'est peu probable. Les fournisseurs de services, ou de cloud, doivent...

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• use ssh tunnel with phpmyadmin

  - by JohnMerlino

  I been using ssh tunnel to bypass firewall of remote mysql server. On my Ubuntu 12.04 installation, it works via the terminal and it works when using a program called mysql workbench. However, that program freezes often and I want to try phpmyadmin as an alternative. However, I cannot connect to remote server using ssh tunnel on phpmyadmin, albeit I can connect locally. These are the steps I've tried: 1) Open a tunnel, listening on localhost:3307 and forwarding everything to xxx.xxx.xxx.xxx:3306 (used 3307 because MySQL on my local machine uses the default port 3306): ssh -L 3307:localhost:3306 [email protected] So now I have the port for tunnel open and I have my local mysql installation default port: $ netstat -tln Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 127.0.0.1:3306 0.0.0.0:* LISTEN tcp 0 0 127.0.0.1:3307 0.0.0.0:* LISTEN tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN ... 2) Now I can easily connect to remote server via localhost using the terminal: $ mysql -u user.name -p -h 127.0.0.1 -P 3307 Notice that I expicitly identify 3307 as the port, so traffic forwards to the remote server, and hence it logs me in to the remote server. Unfortunately, the localhost/phpmyadmin local login interface doesn't allow you to specify a port option. So I modify the config-db.php file and change the $dbport variable to 3307, under the impression that the phpmyadmin interface will now work with port 3307: $ sudo vim /etc/phpmyadmin/config-db.php $dbport='3307'; Then I restart the mysql server. Unfortunately, it didn't work. When I use the remote credentials to login, it gives me error: #1045 Cannot log in to the MySQL server

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• Is it possible to have .bashrc outside home directory?

  - by FSchmidt

  I want to put a .bashrc file in a directory where my application is located, to set up path variables accordingly independent of the location of the directory at the moment. At the same time, I want to be able to run the application right away, without having to source a shell file to set the path every time. Therefore I figured I could use .bashrc which is executed when the non-login terminal is started. If I do put it in the proper .bashrc in the home directory, I would have to give an absolute path which I want to avoid. Is there a way to have something like .bashrc but not in home directory (ie a shell that is executed when terminal is started?)

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• File locked / read-only

  - by oshirowanen

  On a networked computer, I have a file which is coming up as read-only because someone else has it open. This is not true. This is a file stored locally on the computer and it is not being used by anyone else. I can login to the same computer using a different user, and the file opens up fine. I just get the issue with a particular user account. Other than deleting theses account/profile and creating it again, how can I unlock this file? Double clicking on this file gives me a message saying The file is locked for editing by another user, or the file (or the folder in which it is located,) is marked as read-only, or you specified that you wanted to open this file read-only. I don't think the folder is locked, because I can use other files in that folder fine, it's just 1 particular file which is causing this issue. I know that only 1 user is using this file as the file is on his c: and the same file works fine if he logs off to allow another user to log in.

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• The New My Oracle Support User Interface (HTML-based)

  - by user793553

  A single source for learning about the latest enhancements to the My Oracle Support User Interface... On January 27, 2012, we launched a new My Oracle Support HTML-based user interface (UI). The new user interface is built using Oracle’s Application Development Framework and is our first step towards providing a single online support portal for our customers and partners; one that all users will transition to in the coming months. Further enhancements to the HTML-based user interface are planned for April 13, 2012. We will transition users of the standard Flash-based interface in the coming months. To help facilitate a smooth transition, we invite you to preview and begin using the new My Oracle Support interface by going to supporthtml.oracle.com and sign in using your Single Sign-on username and password For full information regarding functionality, supported browsers and links to quick and easy videos on how to navigate the new UI, please check out Doc ID 1385682.1 

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• Oracle VM VirtualBox 4.0 toujours gratuit mais pas ses nouvelles extensions, payantes pour les entreprises

  Oracle VM VirtualBox 4.0 Toujours gratuit mais pas ses extensions, payantes pour les entreprises Oracle vient d'annoncer la disponibilité en version finale de sa nouvelle solution de virtualisation Oracle VM VirtualBox 4.0. issue du rachat de Sun Microsystems. VirtualBox 4.0 est disponible sous licence open-source GNU GPL 2 et supporte plusieurs plate-formes (dont Windows et Linux 32 et 64 bits). Cette version d'Oracle VM VirtualBox intègre plusieurs nouvelles fonctionnalités, dont certaines sont livrées sous forme d'extension. Ces Extensions Packs sont mises à disposition suivant la licence PUEL (Personnal Use and Evaluation Licence), autrement dit, accessible gra...

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• Getting older packages from ppa

  - by highsciguy

  Can I install an older version of a specific package from a ppa? Specifically, I want to get an older version of xserver-xorg-video-intel (and dependencies) from xorg-edgers ppa. The reason is that the older version seemed to work with my hardware. The present version seems to feature (I would like to found out if it is really the source) severe crashes as the present stable releases of this package do. I tried apt-get install pkg=version but didn't succeed. I am afraid that the packages in the cache are lost after apt-get clean I do not even know the precise version number of the previous version, assuming that it doesn't have to be exactly one less. The current version is xserver-xorg-video-intel-2.20.15 Alternatively: Is there a place, e.g. at launchpad, where I can manually download the previous version of the package?

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• Win7 'locking' process/files/folders?

  - by Dynde

  I've had a fair bit problems with sometimes files/folders/processes being 'locked' by Windows. The weird thing is, it's not like the traditional sense, I think, where tools like UnlockIT and wholockme would work. It seems that just giving it a little often helps - making me think it could either be the HDD, the memory, or something in Windows. A scenario: I go into a folder - don't open anything at all, go back up, cut or drag-move the folder to someplace else, it says "Action can't be completed because the folder or a file in it is open in another program". Waiting sometimes 20 seconds sometimes a little longer, and I can move it. Another scenario is deleting a bunch of files in a folder, and it appears that everything is gone, but then suddenly after a few seconds an .exe file pops back up, and I can't delete it. Waiting a few minutes, then pressing refresh and it's gone. I have the strangest feeling that there's a problem with either HDD or memory. I already tried disabling Windows indexing service with no luck. Does anyone have any ideas? EDIT: I should say, that I have a very fast system, 16 GB DDR3 RAM, i7-2600k CPU, SSD main HDD, so I really should not be experiencing any sort of problems, where one might say that it's "reasonable" for the system not to respond right away. Edit2: And I updated SSD firmware a couple months ago, so it shouldn't be bad release FW either

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• OpenJDK 6 B26 Available

  - by user9158633

  On September 21, 2012 the source bundle for OpenJDK 6 b26 was published at http://download.java.net/openjdk/jdk6/. The main changes in b26 are the latest round of security updates and a number of other fixes. For more information see the detailed list of all the changes in OpenJDK 6 B26. Test Results: All the jdk regression tests run with  make test passed on linux. cd jdk6 make make test For the current list of excluded tests see  jdk6/jdk/test/ProblemList.txt file:  ProblemList.html in B26 |  Latest ProblemList.txt (in the tip revision). Special thanks to Kelly O'Hair for his contributions to the project and Dave Katleman for his Release Engineering work.

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• Imagemagick convert creates monochrome output only

  - by rumtscho

  I have a book scan as a pdf. When I open it with Adobe Reader, it looks like grayscale. When I open it with IrfanView, it looks like grayscale, and the Information option tells me that the image is actually 24 bit (I don't know if this is the real bit depth of the image embedded in the pdf or if IrfanView assigns the maximal depth when opening a pdf as image). I want to OCR the scan with OmniPage SE. It doesn't read PDF, so I decided to use ImageMagick to convert the file to PNG first. But no matter what I try, the output is always monochrome and practically unreadable. I tried different conversion lines, with different depth, density and resize values, but it didn't help. What you see was made with the options convert testfile.pdf -density 600x600 -depth 8 PNG:testfile.png. Any idea what causes the problem? Edit: To make it clear, the output looks like this for any value of -density, -depth and -resize I have tried. It also looks like that when I use no options at all, as in convert testfile.pdf PNG:testfile.png.

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• Oracle Catalog – product overview for middleware

  - by JuergenKress

  Are you looking for quick overview of all the Oracle product and solutions? The answer is the Oracle Catalog which helps you to understand the whole stack from hardware, database, middleware all the way to applications. A great source and helpful for sales persons and customers. Make sure you add the file to your mobile device. SOA & BPM Partner Community For regular information on Oracle SOA Suite become a member in the SOA & BPM Partner Community for registration please visit  www.oracle.com/goto/emea/soa (OPN account required) If you need support with your account please contact the Oracle Partner Business Center. Blog Twitter LinkedIn Mix Forum Technorati Tags: Catalog,SOA Community,Oracle SOA,Oracle BPM,Community,OPN,Jürgen Kress

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• Installing drivers for an ATI 6950

  - by aj.esler

  Is there any way to get ubuntu to recognise an ATI 6950? I have tried installing the proprietary ATI drivers, but these do not seem to work properly. It seems to screw up the gnome desktop, and starts booting into terminal. I'm somewhat of a linux newbie, so not really sure whats going wrong. I don't want to game on ubuntu, I just want it to recognise my dual monitor setup rather than mirroring the monitors, so any driver that does this is fine by me. It seems like the open source ATI radeon drivers will not support the 6950/6970 for some time, at least until kernel 2.6.38 is released. The card is also flashed with the 6970 firmware, not sure if this is important. I am running a 64 bit version of ubuntu, I installed ubuntu server 10.10, then installed gnome-desktop.

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• How can I install iTunes in such a way that it can't put any "hooks" or helper programs on my computer?

  - by Joshua Carmody

  I'm buying a new iPad, which means I must once again install iTunes. I've not used iTunes in more than 6 months, since I bought a new computer. I don't like iTunes, but I can live with using it to buy/manage media and sync my Apple devices when the program is open. What I would like to do though, is find a way to install iTunes in such a way that it has absolutely no effect on my system when it is closed. iTunes normally installs several helper programs such as iTunesHelper.exe, and the Bonjour service. These programs run in the background when iTunes is closed. You can force-close them, or remove them from your setup files, but iTunes will often put them right back when you run it. I know these programs are mostly harmless, but they have at times caused issues such as iTunes spending system resources trying to catalog media files or drives connected to VPN, or other issues. At best they're just one more small background process eating up a small piece of my CPU time and RAM. How can I run iTunes without letting it get it's "hooks" into my system? One thought I had is that I could create a Windows user account just for iTunes, and deny it admin privileges. Then if I installed iTunes using that account maybe anything it installed wouldn't affect the "main" account on my PC? But I'm not sure if that would work.... Failing that, maybe some kind of virtualization software or sandbox I could install it in? I'm open to any suggestions. My system is an Intel-based PC running Windows 7 Professional 64-bit. Thanks!

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• Ubuntu 11.10 momentarily freezes every couple minutes

  - by Jeff Welling

  I'm working on an Acer Aspire One D257 running Ubuntu 11.10, and every few minutes the laptop freezes up for a second or two, before becoming responsive again. This doesn't really present a huge problem, but when I'm trying to code all of a sudden vim stops responding for a couple seconds while I'm trying to modify my code, it's increasingly frustrating. The odd part is, if I play a movie in VLC at the same time, when vim pauses the video keeps playing just fine (VLC's priority is not modified). I'm wondering if anyone knows why this may be happening, or in lieu of that, how I might be able to track down the source of my frustrating pauses. Normally I would try using top, but the pauses are shorter than 2 seconds so nothing unusual shows up in top as consuming the CPU. Does anyone know how to troubleshoot intermittent repeating 1 second long pauses in vim?

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• Does ICS modify windows firewall policies in the registry?

  - by insipid

  I had a host machine I wanted to enable ICS on. First I realized that doing so was not possible until I enabled the Windows Firewall. Once I enabled the firewall and set up ICS, I noticed due to group policy I could no longer disable the firewall. Also, any ports I tried to open seemed to be ignored. Although nothing seemed to be configured when I used the mmc snap-in to view local computer policy, when I checked the registry I noticed several policies set there in HKLM (such as disabling AllowLocalPolicyMerge). I was able to remove the policies from the registry and my open ports worked, but they were eventually re-added without my input. The network I am sharing the internet from is an "unsecured" wireless network with an authentication page, is it possible that this is causing those policies to be set? Did ICS set those policies? When you go to the properties of the ICS enabled adapter and go to the ICS settings it takes you to a tab called services where you can add and remove "services running on your network that internet users can access". Is this related to the windows firewall?

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• Win 8.1 Hyper-v Full Screen and VPN problems

  - by tr0users

  I need to connect to my office using Cisco VPN software (RSA). Once connected all my internet traffic goes through the employer's VPN and this prevents me from listening to spotify. As a way around this I created a Win 2012 VM that I run in hyper-v from my Windows 8.1 Client. First I RDP to the VM, then I connect to the VPN. This forces the RDP session between my host laptop and the VM to close. I then open the hyper-v manager and double-click my VM to get a connection back (not great because I don't get the use of copy & paste this way). Previously when I opened my VM this way I would have full screen. I'm using a 1920x1080 monitor. Today when I re-open my connection to the VM it is displayed in a window that uses maybe 75% of the full screen. I have tried the menu option View\Full Screen Mode only centres the screen and apply black borders around the outside. Could anyone please suggest how I may solve the VPN or Full Screen problems? Thanks Rob.

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• Sortie de la version 1.5 de JRuby avec une amélioration du support sous Windows

  Bonjour, La semaine dernière est sortie la version 1.5 de JRuby, version à laquelle ont contribué pas moins de 30 développeurs Open Source. Parmi les 4 core developpers, 3 font partie de la société Engine Yard. Les avancées principales pour cette version sont :Meilleure intégration avec les librairies Java (gestion mémoire et CPU plus efficace) Amélioration de la compatibilité avec Ruby (Ruby 1.8.7) Amélioration du support pour Windows (les nombreux problèmes qui rendait son utilisation sous Windows compliquée ont été traités) Pour les développeurs Java, il est également à noter de meilleures intégration avec Ant et Maven. Qui utilise régulièrement JRuby, et dans quel cadre ?

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• Adding your website to free web directories as a link building strategy

  - by Man

  It's been two month I've launched a website. I recently ran into some websites which list directory of other websites. Some examples can be http://www.addgoogleurl.com/ and webdirectorieslist.com, etc. I was talking with my colleague and he says, adding the URL of my website to these kind of websites will negate the effect of other organic real links. Does google consider positive/negative points for these kind of links from web directory websites? Do you have any source for your answer to refer to? I found this question asked before on webmasters.SE, this is asking about many links from a website.

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• What to choose for beginner: PHP/Python/Ruby

  - by Nai

  I'm a beginner teaching myself to code but I would like he insight of the PSE community and helping choose where to start. My main objective is to be able to create a basic website to first test my business idea and from there iterate on it quickly to minimise my learning time. The most important criteria for me is speed. An example of speed would be pre-built components available open source and not having to write one from scratch. From my research, this seems to be a death match between the following languages and frameworks: PHP and CakePHP Python and Django Ruby and Rails Assumptions: I am going to be equally good (or bad) in all 3. It is going to be equally easy to find competent developers in either language. I know this to be false already by lets assume that it is. This question is not meant to karma whore as I've seen how passionate some of these standoff questions have been and I'll be happy to turn it into a community wiki.

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• Free LINQPad is a great way to learn LINQ!

  - by CatherineRussell

  LINQPad is a great way to learn LINQ: it comes loaded with 500 examples from the book, C# 4.0 in a Nutshell.  There's no better way to experience the coolness of LINQ and functional programming. LINQPad is more than just a LINQ tool: it's an ergonomic C#/VB scratchpad that instantly executes any C#/VB expression, statement block or program with rich output formatting – the ultimate in dynamic development. Put an end to those hundreds of Visual Studio Console projects cluttering your source folder! Best of all, LINQPad standard edition is free and can run without installation (or with a low-impact setup). The executable is 3MB and is self-updating. To get it, go to: http://www.linqpad.net/

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• Upgraded users to Win7. Now getting "path not found" when saving files or opening attachments

  - by Matt Penner

  We have a Server 2008 AD environment with about 5k users. We just rolled out Windows 7 SP1 (were XP) with great success. However, about once a day we get a few calls that a user opens a file from their Documents (the folder is on the server and redirected), edits it and attempts to save but Win7 reports that the path is not found either because it doesn't exist or no permissions. The only way to fix it is to delete the profile. In addition we get about the same number but different users saying that they cannot open attachments from Outlook 2010 due to no permission. We have to edit the temp Outlook storage path in the registry to fix it (or delete the profile). I think the two issues may be related. What scares us is that we rolled out 1 month ago and had no calls of this nature until about 2 weeks ago. It started off as one or two but seems to be growing. Any ideas? We're going to open a Microsoft ticket but I wanted to seenif anyone else has run into this. Thanks!

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