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Articles indexed in September 2012

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  • Books or other materials to overcome Linux learning curve?

    - by Marek Osvald
    I was born in 1989 and am an active Windows user since 1993. I've always struggled with Linux, not being able to configure the system the way I would like, snooping through blogs and forums for answers, never actually overcame the barrier. The books I've seen and read are either completely command line oriented (and don't get me wrong it's awesome to know this stuff when you're working on a server for example) but seems rather impractical to me on a desktop computer that's partially my development environment. The other kind are user manual describing step-by-step the controls of simplest applications like the Calculator, totally useless to me. What would you recommend for a programmer who needs to learn how to work with Linux but already knows the basics? What materials did you use to learn how to start with Linux?

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  • How to hide a program that is running on a virtual machine?

    - by Femto Trader
    Some softwares contain tests to see if they are running on a virtual machine. It's very unpleasant to see alert messages such as "Sorry, this application cannot run under a Virtual Machine." and have your software stopped! There is a lot of legal reasons to override such tests. Moreover such limitations are (most of the time) not written in User License Agreement. So... how to hide a program that is running on a virtual machine? I'm using a Virtual Private Server (VPS) with Hyper-V... I'm administrator of the Operating System (Windows 2003) installed on this VPS, not administrator of Hyper-V.

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  • Hadoop is not able to find JAVA_HOME properly

    - by Shekhar
    I am trying to run hadoop my Ubuntu OS. I have set JAVA_HOME variable in ~/.bashrc file to /usr/lib/jvm/jdk1.7.0_01/ but when I run hadoop namenode -format command it fails with following errors : shekhar@ubuntu:/usr$ hadoop namenode -format Warning: $HADOOP_HOME is deprecated. /host/Shekhar/Softwares/hadoop-1.0.0/bin/hadoop: line 321: /usr/jdk1.7.0_01/bin/java: No such file or directory /host/Shekhar/Softwares/hadoop-1.0.0/bin/hadoop: line 387: /usr/jdk1.7.0_01/bin/java: No such file or directory hadoop tries to locate java command at /usr/jdk1.7.0_01/bin/ path. Clearly somehow it missed /lib/jvm folder. I am not able to understand why and how this is happening. my echo $PATH command gives following output : shekhar@ubuntu:/usr$ echo $PATH /usr/lib/jvm/jdk1.7.0_01/bin:/usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/lib/jvm/jdk1.7.0_01/bin:/host/Shekhar/Softwares/hadoop-1.0.0/bin If I run which java command I get following output : shekhar@ubuntu:/usr$ which java /usr/lib/jvm/jdk1.7.0_01/bin/java and echo $JAVA_HOME returns following output : shekhar@ubuntu:/usr$ echo $JAVA_HOME /usr/lib/jvm/jdk1.7.0_01 I would like to know why hadoop is taking JAVA_HOME path incorrectly. Please help...

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  • Windows Server 2008 R2 and OSX 10.5/.6/.7, Search, Spotlight

    - by Keith Loughnane
    I'm handling a migration from a on old mac server to a Windows Server 2008 R2 machine running a 12TB(10 usable) RAID5 server. It's using an SMB share and now the OSX 10.5/.6 users can search sometimes it works but takes up to 10 minutes. The OSX 10.7 machine seems to be fine. I've looked in the root of the shared drive for a .Spotlight-V100 file (ls -a) but it doesn't seem to be there. mdutil says indexing is on for that volume and I have cleared the index using mdutil -E /Volumes/MeSharedVolume numerous times. Any ideas?

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  • google video chat works faster on local LAN

    - by bashrc
    Recently the internet speed on our college LAN has dropped drastically. ( Avg file download speed 13 Kbps :( ). However g-talk's video chat remains unbelievably fluent when done with someone within the college's LAN. However video chat is practically impossible for anyone else who is not in the college network. My college has a proxy server through which all computers inside the college connect to the internet. I suspect its due to the proxy server. Also how g-talk maintains video chat? Is it something in the mechanism that speeds up video chat between two clients with the same IP? Since all computers use the same proxy,their IP would appear to be the same to google server.

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  • Proxy within a proxy, tunneling?

    - by joeblogger
    At work there is a proxy that (understandably) blocks all ports except web ones. However, during lunch hours you are allowed to play online games. But as ports are blocked, multiplayer games are out of the question. So I was wondering, could I set up a tunnel on a web port, that would then allow me to access those blocked ports, through the port 80 tunnel whilst still being behind the work proxy? This is in a Windows environment.

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  • Changing ati graphics setting into a batch file

    - by FrozenKing
    I want to change my saturation level to zero and again to default but I can do it manually by going to ati catalyst center. Since, I want to do it regularly I need some batch file code or program to alter this settings in a click or using shortcut keys. The reason I am doing this because I want to change my screen to black and white from color since b/w will make my eyes less tired then a colored display. I came to know about this saturation from my previously asked question : Changing display color from B/W to color (vice-versa)using a program.

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  • How can I restore my laptop from Windows 7 to its original Windows Vista recovery partition?

    - by Cam Jackson
    I bought my Acer laptop 4 years ago with Vista Home Premium x86. It has a recovery partition that I have used successfully in the past to format everything and reinstall Windows to factory settings. I have since upgraded to Windows 7, but I now need to get back to my original installation. Not sure what it's called, but I can successfully get into this recovery thingy: However, when I click the third option (for me I think it says 'Windows Image Recovery' or something like that) it tells me that it can't find any images to recover from :( I have checked and I don't have a windows.old that I can recover from either. One final note, if I launch diskmgmt.msc, these are the partitions: Why is the first partition shaded? Does that mean anything? Both of the 'unlettered' partitions are 100% empty. Did the Windows 7 upgrade process format my Vista system recovery partition?! And finally: How can I get back to my factory settings? EDIT: I did see this question, but neither of the answers apply to my situation. Edit to address jdh's answer: From what I can tell, I never get the option to boot the Vista recovery partition. After hitting F10, I get this screen, except it's partition 2, and I don't have the IN/MINT bit: I hit Escape, and then I get this screen, except without Ubuntu listed, and without the auto-countdown thing: I hit F8, and then I get this screen: I hit Enter on the first option, I end up at the screen in the first screen shot. As I said, from there I click the third option, and it fails to find the image, which I guess makes sense if it's only looking for a Windows 7 recovery. So I either need to make the Windows 7 tool see the Vista recovery partition, or I need the boot loader (?) to let me select Vista earlier in the process. Any ideas?

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  • Why can a network address not be a valid host address?

    - by Goblinlord
    So... I have studied for CCNA and such and been working with IP networking at the least the past 8 years or so. I have always seen and been told that the network address for a subnet is not a valid host address. Now first I will start by saying I know this is true. My question is more... is there a technical reason it can not be used or was it just arbitrarily agreed upon when the specification was designed? I understand why a broadcast address can not be used (because it is ACTUALLY used). The thing is when I see a network address used it is normally only in routing which is specifically using NETWORK addresses. This being the case, (network addresses being used only when you are expecting a network address) is there some technical reason that they could not have the network address be an actual valid host address?

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  • Cannot connect to internet with Clearwire modem

    - by ide
    I'm currently using a Motorola WiMAX modem (CPEi 25725) and cannot connect to the internet. I can connect to the modem at 192.168.15.1 and check its status. It says that it has good/excellent connectivity to the internet and shows all five signal bars. Additionally it has sent and received some WiMAX packets so I believe it is connected to a tower. I'm at a loss for what the problem is. Unplugging the modem, restarting it from software, and restarting my computer (Windows 7) have not helped. Windows still reports that it is not connected to the internet. Alternatively, could this be an ISP issue? I have heard that Clearwire is a not-so-reputable ISP that blocks VoIP, and I was using Skype recently. EDIT: I called Clear's tech support and apparently their network is having significant problems at the moment. Guess there's nothing an end-user can do about it.

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  • Desktop Fun: Cloud Chaser Wallpaper Collection Series 2

    - by Asian Angel
    Last year we shared a wonderful collection of cloud wallpapers with you and today we are back with more cloudy goodness. Float away with the clouds on your desktop with the second in our series of Cloud Chaser Wallpaper collections. 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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  • Sneak Peak: Social Developer Program at JavaOne

    - by Mike Stiles
    By guest blogger Roland Smart We're just days away from what is gunning to be the most exciting installment of OpenWorld to date, so how about an exciting sneak peak at the very first Social Developer Program? If your first thought is, "What's a social developer?" you're not alone. It’s an emerging term and one we think will gain prominence as social experiences become more prevalent in enterprise applications. For those who keep an eye on the ever-evolving Facebook platform, you'll recall that they recently rebranded their PDC (preferred developer consultant) group as the PMD (preferred marketing developer), signaling the importance of development resources inside the marketing organization to unlock the potential of social. The marketing developer they're referring to could be considered a social developer in a broader context. While it's true social has really blossomed in the marketing context and CMOs are winning more and more technical resources, social is starting to work its way more deeply into the enterprise with the help of developers that work outside marketing. Developers, like the rest of us, have fallen in "like" with social functionality and are starting to imagine how social can transform enterprise applications in the way it has consumer-facing experiences. The thesis of my presentation is that social developers will take many pages from the marketing playbook as they apply social inside the enterprise. To support this argument, lets walk through a range of enterprise applications and explore how consumer-facing social experiences might be interpreted in this context. Here's one example of how a social experience could be integrated into a sales enablement application. As a marketer, I spend a great deal of time collaborating with my sales colleagues, so I have good insight into their working process. While at Involver, we grew our sales team quickly, and it became evident some of our processes broke with scale. For example, we used to have weekly team meetings at which we'd discuss what was working and what wasn't from a messaging perspective. One aspect of these sessions focused on "objections" and "responses," where the salespeople would walk through common objections to purchasing and share appropriate responses. We tried to map each context to best answers and we'd capture these on a wiki page. As our team grew, however, participation at scale just wasn't tenable, and our wiki pages quickly lost their freshness. Imagine giving salespeople a place where they could submit common objections and responses for their colleagues to see, sort, comment on, and vote on. What you'd get is an up-to-date and relevant repository of information. And, if you supported an application like this with a social graph, it would be possible to make good recommendations to individual sales people about the objections they'd likely hear based on vertical, product, region or other graph data. Taking it even further, you could build in a badging/game element to reward those salespeople who participate the most. Both these examples are based on proven models at work inside consumer-facing applications. If you want to learn about how HR, Operations, Product Development and Customer Support can leverage social experiences, you’re welcome to join us at JavaOne or join our Social Developer Community to find some of the presentations after OpenWorld.

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  • Function calls to calls in windows api

    - by Apeee
    I am a beginner, and learning C, I find it hard to grasp the whole programming concept. so hopefully this would help to clear up some things along the way. When programming in windows, which is my aim for the time being, it is really hard for me to understand how windows communicate with the programs that run on it. A question i have been pondering about is how when you incorporate a function call which is in another memory location on the disk or memory(not a function you yourself wrote and is included in the compilation), especially the windows API, does the compiler know where the function location is so when the program is run it can call that function? For example, a very simple program that displays a window which reads hello world. You would have to call windows API functions to achieve such features as creating the window, its size, colors and so on... So basically what I am struggling to grasp is how the programs I write communicate with the platform, framework they are run on(generally windows for Windows API). Apart from clarification on this one above, i would love a resource that explains this concept further. Thanks for your time!

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  • Developing a search algorithm

    - by Richart Bremer
    I want to create a basic search engine, and I want you to give me some ideas how to filter out the best results for my visitors. I have three fields regarding a product the user can search in: Title Category Description I came up with these ideas and I ask you to either competently criticize them or add to them. If the search term occurs in all three fields it should be among the first results. If it is in two of the fields it is below the results of 1. Combine the amount of occurences and output a value in per cent. For instance if in all fields together the term clock appeared 50 times and in all fields together there are 200 words, then the per cent value is 50/200*100 = 25%. Another product entry amounts to say 20% so product one having 25% is listed before product two having 20%.

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  • python factory function best practices

    - by Jason S
    Suppose I have a file foo.py containing a class Foo: class Foo(object): def __init__(self, data): ... Now I want to add a function that creates a Foo object in a certain way from raw source data. Should I put it as a static method in Foo or as another separate function? class Foo(object): def __init__(self, data): ... # option 1: @staticmethod def fromSourceData(sourceData): return Foo(processData(sourceData)) # option 2: def makeFoo(sourceData): return Foo(processData(sourceData)) I don't know whether it's more important to be convenient for users: foo1 = foo.makeFoo(sourceData) or whether it's more important to maintain clear coupling between the method and the class: foo1 = foo.Foo.fromSourceData(sourceData)

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  • How to deal with almost the same enums?

    - by reza
    I need to define enums in several classes. The majority of fields are the same in all of the enums. But one has one or two more fields, another has fewer fields. Now I wonder what is the best way to deal with this? Create separate enums public enum Foo {field1, field2, field5 }; public enum Bar {field1, field2, field3, field4 }; or use a general enum for them all public enum FooBar {field1, field2, field3, field4 , field5}; The enumerations contain the list of actions available for each class.

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  • what should I read in Windows [closed]

    - by Umesha MS
    I think I am asking generic question. Being a developer in windows what should I read to improve my skills? Do I need to read concepts on need basis or do I need to read concepts well in advance? If I want to read the concepts in advance then what topics do I need to read. (Note : I am a Windows developer. I use c++ programming language, Win32/MFC frame work and I use Visual studio IDE.) Updated: To be more specific when a fresher comes to my team I will ask him to read the following things and I tell him that these are very important. 1)C++ : 1 The C++ Programming Language by Bjarne Stroustrup's 2 Thinking in C++ 2nd Edition by Bruce Eckel 2)Win32/MFC : 1 Programming Applications for Microsoft Windows by Jeffrey Richter 2 windows programming by charles petzold 3 Programming Windows with MFC –by Jeff Prosise For 2 years and above developer I ask them to read 1)Above concepts (C++ and Win32/MFC)are mandate 2)Design Pattern : 1)Gang Of Four. 2)Head first patter. 3)Design princples. But for above 6 years’ experience developer what are the concepts are important.

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  • How can I figure out if programming is right for me? [closed]

    - by user66414
    I have an IT background and was pretty confident until an opportunity came up at work to go into programming(C#). I have never programmed before this, and the software I am programming for is a program I have never used before (a 3D modeling software). It has been 6 months since then and I feel like giving up. I didn't get much training... about 3 weeks of training spread out over the last 6 months. I think I would be good at programming but this experience is kinda making me rethink my decision. I'm not sure if it's just me, or if this frustration is normal. How can I tell if programming is right for me?

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  • What is a good toy example to teach version control?

    - by janos
    I am looking for practical examples to use when teaching version control. Breaking down the material to basic concepts and providing examples is an obvious way to teach version control, but this can be very boring, unless the examples are really practical or interesting. One idea I have is customizing a wordpress theme. I use wordpress a lot and no theme is ever perfect, so I typically just put the theme directory in version control using any dvcs and start recording changes. The problem with this example is that not many people in the audience may be familiar with wordpress, let alone have shell access to a wordpress site to try out the commands. Preparing a mock site and giving access to everyone is also not an option for me. I need a "toy example" that can be interesting to a broad audience of software developers, and something they can try on their own computers. The tutorial will use a dvcs, but the practical example I'm looking for is only to teach the basic features of version control, ignoring the distributed features for the moment. (Now that I think of it, instead of a mock site, a customized live cd might do the trick...) Any better ideas?

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  • When should I start learning a PHP Framework

    - by Festus
    I'm a beginner programmer I have been learning PHP for a while, though not consistently. But for the past few months (say 3 months) I have been a bit consistent in my learning, largely because of a project a friend ask me to do for him since he knew I was into web design. Though I struggled to complete the tiny project for him after about 3 weeks, because I got stuck some times and I have to look up tutorials/references relating to the problem I was trying to solve, but I feel fulfilled been able to accomplish a project and along the way grab most of PHP basics. My interest in Web development has grew higher since completing that project and I have been trying to learn PHP/MySQL as fast as I could, because the same friend want me to do something else for him, which to me is way beyond the basics I know. Though I don't charge him anything, but it gives me a sense of fulfillment. I want to learn a framework, because I heard it can make you accomplish more as a web developer and makes life much easier. Can I learn a framework without having OOP knowledge? I know how to create and use functions, though I don't use it much I know my question is not straight forward, but I know you will understand were I'm coming from and advice me appropriately. I wish to become a professional Web Developer. I really need your professional advice.

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  • Best Usage of Multiple Computers For a Developer

    - by whaley
    I have two Macbook Pros - both are comparable in hardware. One is a 17" and the other a 15". The 17" has a slightly swifter CPU clock speed, but beyond that the differences are completely negligible. I tried a setup a while back where I had the 17" hooked up to an external monitor in the middle of my desk with the 15" laptop immediately to the right of it, and was using teleport to control the 15" from my 17". All development, terminal usage, etc. etc. was being done on the 17" and the 15" was primarily used for email / IM / IRC... or anything secondary to what I was working on. I have a MobileMe account so preferences were synced, but otherwise I didn't really use anything else to keep the computers in sync (I use dropbox/git but probably not optimally). For reasons I can't put my finger on, this setup never felt quite right. A few things that irked me was the 15" was way under-utlized and the 17" was overutilized having 2 laptops and a 21" monitor all on one desk actually took up lots of desk space and it felt like I had too much to look at. I reverted back to just using the 17" and the external monitor and keeping the 15" around the house (and using it very sparingly). For those of you who are using multiple laptops (or just multiple machines for that matter), I'd like to see setups that work for you for when you have 2 or more machines that gives you optimal productivity and why. I'd like to give this one more shot but with a different approach than my previous - which was using the 15" as a machine for secondary things (communication, reading documentation, etc. etc).

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  • Recommended solutions for integrating iOS with .NET, at the service tier

    - by George
    I'm developing an application, in iOS, that is required to connect to my Windows Server to poll for new data, update, etc. As a seasoned C# developer, my first instinct is to start a new project in Visual Studio and select Web Service, letting my bias (and comfort level) dictate the service layer of my application. However, I don't want to be biased, and I don't base my decision on a service which I am very familiar with, at the cost of performance. I would like to know what other developers have had success using, and if there is a default standard for iOS service layer development? Are there protocols that are easier to consume than others within iOS? Better ones for the size and/or compression of data? Is there anything wrong with using SOAP? I know it's "big" in comparison to protocols like JSON.

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  • Why is Java the lingua franca at so many institutions?

    - by Billy ONeal
    EDIT: This question at first seems to be bashing Java, and I guess at this point it is a bit. However, the bigger point I am trying to make is why any one single language is chosen as the one end all be all solution to all problems. Java happens to be the one that's used so that's the one I had to beat on here, but I'm not intentionality ripping Java a new one :) I don't like Java in most academic settings. I'm not saying the language itself is bad -- it has several extremely desirable aspects, most importantly the ability to run without recompilation on most any platform. Nothing wrong with using the language for Your Next App ^TM. (Not something I would personally do, but that's more because I have less experience with it, rather than it's design being poor) I think it is a waste that high level CS courses are taught using Java as a language. Too many of my co-students cannot program worth a damn, because they don't know how to work in a non-garbage-collected world. They don't fundamentally understand the machines they are programming for. When someone can work outside of a garbage collected world, they can work inside of one, but not vice versa. GC is a tool, not a crutch. But the way it is used to teach computer science students is a as a crutch. Computer science should not teach an entire suite of courses tailored to a single language. Students leave with the idea that all good design is idiomatic Java design, and that Object Oriented Design is the ONE TRUE WAY THAT IS THE ONLY WAY THINGS CAN BE DONE. Other languages, at least one of them not being a garbage collected language, should be used in teaching, in order to give the graduate a better understanding of the machines. It is an embarrassment that somebody with a PHD in CS from a respected institution cannot program their way out of a paper bag. What's worse, is that when I talk to those CS professors who actually do understand how things operate, they share feelings like this, that we're doing a disservice to our students by doing everything in Java. (Note that the above would be the same if I replaced it with any other language, generally using a single language is the problem, not Java itself) In total, I feel I can no longer respect any kind of degree at all -- when I can't see those around me able to program their way out of fizzbuzz problems. Why/how did it get to be this way?

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  • Ubuntu always freezes on a friend's machine

    - by missingfaktor
    I am posting this on my friend's behalf. I installed Ubuntu 12.04 on my friend's computer but it continuously froze, no desktop effects worked, and it was frankly unusable. I thought this might be an issue with Unity and how it interacts with his hardware, so I tried several other desktop environments on his machine. These include KDE, Xfce, and GNOME. The problems persisted regardless of the desktop environment. I would like to note that he dual boots his system with Windows 7. Even there no desktop effects work but the system is reasonably stable. The following screenshots describe some of his system information (He is running Xfce at this time): 1: 2: Card information: intel corporation 82G33/G31 integrated graphics controller (rev02). What is the issue and how can it be solved? Please let me know if I should add any more information. Thank you.

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  • 12.04: I need a new network card - and I think this one may work?

    - by Jason Malone
    I found this list of compatible USB wireless network adaptors: http://www.cyberciti.biz/tips/linux-usb-wireless-compatibility-adapter-list.html Listed here is the Belkin F5D8053. I'm looking for a store to buy a suitable adaptor in locally and I can't find that particular adaptor - but I can see a Belkin F7D4101az. I think this is simply a newer model - but a Google search for "ubuntu belkin f7d4101az" brings no results - not even people trying to get it to work. Nothing. So I didn't want to purchase it without being sure. There's really only one PC shop that sells this sort of stuff around here - so here's a list of all my available options: http://www.pcworld.co.uk/gbuk/wireless-cards-adapters/xx_7088_70095_xx_xx/xx-criteria.html I'd really like to get one today, because I have a lot of work to do and don't really want to have to wait a week for a new adaptor - I spent 6 or 7 hours last night trying to get my Dell 1450 to work with no luck. Any help would be much appreciated.

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