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• O'Reilly 50& off offer on CSS3 books to 05:00 PT on Oct/28

  - by TATWORTH

  Originally posted on: http://geekswithblogs.net/TATWORTH/archive/2013/10/21/oreilly-50-off-offer-on-css3-books-to-0500-pt.aspxAt  http://shop.oreilly.com/category/deals/css3.do?code=WKCSS&imm_mid=0b155e&cmp=em-prog-books-videos-lp-owo_css3_direct_wkcss, O'Reilly are offering 50% off a number of e-books on mastering CSS3 to 05:00 PT on Oct 28 "CSS3—the technology behind most of the eye-catching visuals on the Web today—is loaded with capabilities that once would have required JavaScript or third-party plugins, such as animation, pseudo-classes, and media queries. Use CSS3 to transform markup into stunning, richly detailed web pages that look great in any browser. For one week only, SAVE 50% on CSS3 ebooks from shop.oreilly.com and take your sites from ordinary to incredible."

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• How can I work out how many IP addresses there are in a given range?

  - by Jarede

  I'm wondering if there is a formula to work out the amount of IP addresses in a given range. I have a system that takes either a single IP address or a start and and end IP address: A single one might be: 145.16.23.241 A range might be: 145.16.23.122 - 145.16.23.144 The people inputting these aren't technical, nor are they receiving these details from technical people, so suggesting using CIDR notation isn't an answer for me. I want to be able to highlight that when entering a range such as: 122.100.10.12 - 128.10.200.140 it might not actually be a range and rather 2 singular IP addresses since such a range would comprise of x (large number of) IP addresses. Is there a basic formula to help me highlight this?

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• Does SEO optimisation count on the responsive side of a site?

  - by Rick Donohoe

  I'm looking at making some SEO optimisation fixes, and at this point I'm sorting out the heading structure and keywords - H1's, H2's etc We have a site where there are a number of similar blocks, and one is always visible, and one is hidden depending on the screen size. This is our method of making a single site responsive. Firstly, how does this technique affect the SEO, and in general does the responsive side of a site matter at all to search engines? What I mean by this is if the site has different content depending on screen sizes, then which content would the search spider crawl?

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• How do I clear all gnome shell notifications?

  - by user19448

  I use Jupiter as a power manager. Now I get a good number of notifications from it. I do not have problem with the fact that I get all these notifications. I do however, want to be able to clear all gnome shell notifications with a few clicks. Currently, my entire bottom edge of the screen is filled with notifications and I do not wish to clear each item one by one. So my question is, how do I clear these notifications? If this is not possible in the ui, is it possible to write an extension to do it? Where should I suggest this feature to gnome developers? Gnome forums are almost dead now, the administrator has not activated my created account since 5 days!

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• Where to find PHP version usage stats?

  - by Darren Cook

  My original question was: what percentage of sites are using php 5.4.x? (As it has some very interesting new features.) With secondary questions like how many of the cheap web hosting places have upgraded, which versions of the linux distros include it, etc. But I'm coming up blanks. http://php.net/usage.php stops at July 2007, and the nexen.net website seems to have stopped in 2008. At SecuritySpace they only list the web servers, not php versions. The TIOBE link isn't what I'm after (it doesn't -- and couldn't -- break down by version number. I thought php.net might show download numbers, but I cannot see them anywhere. I kind of answered the distro question, but it requires a lot of clicking around at distrowatch.com. E.g. I see here that Ubuntu offers php 5.4.6 in the latest snapshot, but the latest release (Ubuntu 12.04) has 5.3.10.

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• Design a Distributed System

  - by Bonton255

  I am preparing for an interview on Distributed Systems. I have gone through a lot of text and understand the basics of the area. However, I need some examples of discussions on designing a distributed system given a scenario. For example, if I were to design a distributed system to calculate if a number N is primary or not, what will the be design of the system, what will be the impact of network latency, CPU performance, node failure, addition of nodes, time synchronization etc. If you guys could present your in-depth thoughts on this example, or point me to some similar discussion, that would be really helpful.

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• What is the best database design for managing historical information? [closed]

  - by Emmad Kareem

  Say you have a Person table with columns such as: ID, FirstName, LastName, BirthCountry, ...etc. And you want to keep track of changes on such a table. For example, the user may want to see previous names of a person or previous addresses, etc. The normalized way is to keep names in separate table, addresses in a separate table,...etc. and the main person table will contain only the information that you are not interested in monitoring changes for (such information will be updated in place). The problem I see here, aside form the coding hassle due to the extensive number of joins required in a real-life situation, is that I have never seen this type of design in any real application (maybe because most did not provide this feature!). So, is there a better way to design this? Thanks.

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• Oracle Enterprise JavaBeans (EJB) Developer Certification

  - by user33716

  I would like to gain the "Oracle Enterprise JavaBeans (EJB) Developer" certification. According to this page I have to take a number of classes each of which costs up to a couple of thousand GB£. Is this really the only way to obtain the certification? Can I not just buy a certification guide book from amazon and just sit the requisite tests? At the moment I have no Java EE experience and I'm finding it impossible to get interviews for the jobs I'm interested in. I'm hoping this will at least help me get my foot through the door.

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• Is there a size limit when using UICollectionView as tiled map for iOS game?

  - by Alexander Winn

  I'm working on a turn-based strategy game for iOS, (picture Civilization 2 as an example), and I'm considering using a UICollectionView as my game map. Each cell would be a tile, and I could use the "didSelectCell" method to handle player interaction with each tile. Here's my question: I know that UICollectionViewCells are dequeued and reused by the OS, so does that mean that the map could support an effectively infinitely-large map, so long as only a few cells are onscreen at a time? However many cells were onscreen would be held in memory, and obviously the data source would take up some memory, but would my offscreen map be limited to a certain size or could it be enormous so long as the number of cells visible at any one time wasn't too much for the device to handle? Basically, is there any memory weight to offscreen cells, or do only visible cells have any impact?

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• Is there a difference between multi-tasking and time-sharing?

  - by Dummy Derp

  Just going over my school notes, my teacher identifies multi-tasking OS, and time-sharing OS as two different things. I really don't see a difference between the two. MULTI-TASKING: You load a number of programs in the memory and execute them. You execute another program if the time quantum allocated to the current program expires OR if it goes on to do I/O and leaves the CPU OR if it finishes execution. TIME-SHARING: the same,again. The same applies in case of serial processing and batch processing. Although they are the same, I guess the only difference would be the way in which control information is passed to the CPU. Maybe, and again MAYBE, in serial processing you need to provide the punch cards with all the processes while in batch, the entire batch uses the same set of control information. Like all the print jobs would have the same control information.

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• Animating isometric sprites

  - by Mike

  I'm having trouble coming up with a way to animate these 2D isometric sprites. The sprites are stored like this: < Game Folder Root /Assets/Sprites/< Sprite Name /< Sprite Animation /< Sprite Direction /< Frame Number .png So for example, /Assets/Sprites/Worker/Stand/North-East/01.png Sprite sheets aren't really viable for this type of animation. The example stand animation is 61 frames. 61 frames for all 8 directions alone is huge, but there's more then just a standing animation for each sprite. Creating an sf::Texture for every image and every frame seems like it will take up a lot of memory and be hard to keep track of that many images. Unloading the image and loading the next one every single frame seems like it will do a lot of unnecessary work. What's the best way to handle this?

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• How To Uninstall Your Windows Product Key Before You Sell Your PC

  - by Taylor Gibb

  Do you have an old PC you want to sell, but also want to use your Windows license on your new PC ? There is a hidden command in Windows that allows you to do just that. Read on to find out more. Note: Between Microsoft and your OEM there are a number of different laws that determine whether you are allowed to use your license on another PC, so follow this tutorial at your own risk. Additionally before you go through the tutorial you will want to check that your product key is still attached to your PC/Installation CD, if it is not , do a quick Google search on how to recover it. 6 Ways Windows 8 Is More Secure Than Windows 7 HTG Explains: Why It’s Good That Your Computer’s RAM Is Full 10 Awesome Improvements For Desktop Users in Windows 8

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• Phantom activity on MySQL

  - by LoveMeSomeCode

  This is probably just my total lack of MySQL expertise, but is it typical to see lots of phantom activity on a MySQL instance via phpMyAdmin? I have a shared hosting plan through Lithium, and when I log in through the phpMyAdmin console and click on the 'Status' tab, it's showing crazy high numbers for queries. Within an hour of activating my account I had 1 million queries. At first I thought this was them setting things up, but the number is climbing constantly, averaging 170/second. I've got a support ticket in with Lithium, but I thought I'd ask here if this were a MySQL/shared host thing, because I had the same thing happen with a shared hosting plan through Joyent.

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• Best Practice to return responses from service

  - by A9S6

  I am writing a SOAP based ASP.NET Web Service having a number of methods to deal with Client objects. e.g: int AddClient(Client c) = returns Client ID when successful List GetClients() Client GetClientInfo(int clientId) In the above methods, the return value/object for each method corresponds to the "all good" scenario i.e. A client Id will be returned if AddClient was successful or a List< of Client objects will be returned by GetClients. But what if an error occurs, how do I convey the error message to the caller? I was thinking of having a Response class: Response { StatusCode, StatusMessage, Details } where Details will hold the actual response but in that case the caller will have to cast the response every time. What are your views on the above? Is there a better solution?

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• How-To: AutoVue Bug Status Tracking & Email Notifications

  - by Graham McKendry

  I’ve posted a number of different Support process-related and tool-related blog entries over the past few years, and one common question I received back from various customers and partners is “How can I easily track AutoVue bugs & enhancements for status updates?” The capability to track bug status through the My Oracle Support (MOS) portal has existed in different forms for a while, although hasn’t necessarily been easy to find without going through specific segments of the extensive MOS training. Recently, the instructions were consolidated into the following highly recommended knowledge base article: KM Note 1298390.1 - How to Monitor a Bug from My Oracle Support The note covers various capabilities, including: How to add the new ‘Bug Tracker’ widget to your MOS dashboard How to add and manage bugs within the Bug Tracker and probably most interesting to MOS users... How to enable email notifications for bug status updates Make sure to pass this KM Note along to your MOS users in case they haven’t already configured this valuable feature.

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• Can I use a desktop as a network server?

  - by Jhourlad Estrella

  Pardon me if I'm asking the wrong question. But I am a newbie in networking and I'm not sure what direction to go on this. I have just setup an Ubuntu Desktop. I am planning to convert it to a network server without losing the GUI interface (again, I'm a newbie) and use it to manage and monitor user access to a network with a small number of network terminals all running on Windows. My purpose is to use the new server to filter sites accessed by each terminals, monitor sites being visited by employees and grant access to both group and user-specific folders based on their IP address. Is this possible? What server software do I need to install? How do I structure the hardware? (I have a router, a hub, the Ubuntu server and the network terminals) How do I assign privileges to users and monitor them at the same time? Thank you in advance for your replies.

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• vlc issue with unity

  - by bob

  I'm using ubuntu 12.04 with unity 3d. I am having troubles to lock vlc (version: VLC media player 2.0.1 Twoflower (revision 2.0.1-0-gf432547)) to the left panel. It doesn't behave the same way other applications do. This is a fresh install from the repo, I didn't change any settings. Ubuntu 12.04 is also a fresh install. For example, (left) clicking on it doesn't bring it to front, but creates a new instance (this in particular is very annoying, if it gets behind another window, that happens to be maximized, there is no way to bring it back up). It also doesn't have a right arrow to say the number of instances there is. Any way around that ?

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• Subtext 2.5 is released!

  After more then one year since last release, we are happy to announce that the new version of Subtext, number 2.5, has just been released. The main features are the new dashboard, featuring the Ayendes formula for blog post popularity, and a improved site-wide search based on Lucene.net. More about that will be published shortly, in the meantime you can read how the search engine has been implemented using Lucene.net. Lots of improvements have been made to the codebase of Subtext for this release: ...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• What software development model has worked best for software teams with heavy dependancy on hardware teams?

  - by MasterDIB

  So, let me explain more. There are a number of competing best practices for software development. I can find that many teams have benefited from Agile practices in some cases. In some other cases, using the Unified Process has been championed by large companies like IBM. The common themes that I find seemed to work well for teams that mainly develop software. I am interested to know what has worked best for people who have worked in shops where there is a team on the other side that produce the hardware that your software is running on. For example, one team puts together a crate with several custom hardware on it; while you need to develop the software that would run on those crates. I can't find a development model (agile, spiral ...) that works best in this case. Any wisdom is this area will be well appreciated.

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• Window colors/shades/decoarations/whatever per instance

  - by user35186

  Sometimes I open several instances of one program at the same time and have to switch between them every few seconds and get totally confused as to which is which (they all display similar information, except few bits). I'd like to have each one of them color-coded, different shades, window border, etc or have anything visual to make them differ from one another to ease the confusion. Ideally this would happen automatically when I launch a new instance. I guess this belongs to the window manager so mine is xfce. In one of the window managers I used to use a huge label was displayed each time I switched between workspaces, something like that (with window title or simple number) would do as well. Any clues?

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• Can I use Ubuntu One Icons for 3rd party thingy?

  - by Joseph Mills

  So I am wondering what the guide lines are for using Ubuntu One icons as I have heard from a number of people that Ubuntu One has some propitiatory things to it. So I am not sure if I am to use there logo in something like this http://bazaar.launchpad.net/~josephjamesmills/ubuntutv/fan_art/download/josephjamesmills%40gmail.com-20120728145710-sy00cvq1ja8o9qad/ubuntuoneactive.png-20120728145613-jtjdupswpqiocpb2-266/ubuntuone-active.png If That is OK ? I know that this might be a silly question but I do not want to get myself in trouble.Thanks so much for reading this and helping me with a project that helps others ;)

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• "Fatal Error" message during boot process

  - by Denja

  I'm running Ubuntu 10.10 with ATI proprietary FGLRX graphic drivers When I boot, I can see this very quick message appearing; I don't have time to read it: **Fatal Error ..................................**(&@something i cant read) I searched through the log file in /var/log/ in order to find what is wrong and I did find something in the /var/log/Xorg.1.log: 21:31:08 [ 15.734] (--) using VT number 1 [ 204.647] Fatal server error: [ 204.647] xf86OpenConsole: VT_WAITACTIVE failed: Interrupted system call [ 204.647] [ 204.647] Please consult the The X.Org Foundation support at http://wiki.x.org for help. [ 204.647] Please also check the log file at "/var/log/Xorg.1.log" for additional information. [ 204.647] But this is already Xorg.1.log. And there is a Xorg.0.log also & Xorg.0.log.old but it doesnt have any error in it. My system seems to work properly and it seems its not affected by this But how do I correct this message? Any suggestions?

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• Calculating the rotational force of a 2D sprite

  - by Jon

  I am wondering if someone has an elegant way of calculating the following scenario. I have an object of (n) number of squares, random shapes, but we will pretend they are all rectangles. We are dealing with no gravity, so consider the object in space, from a top down perspective. I am applying a force to the object at a specific square (as illustrated below). How do I calculate the rotational angle, based on the force being applied, at the location being applied. If applied in the center square, it would go straight. How should it behave the further I move from the center? How do I calculate the rotational velocity?

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• Blocking path scanning

  - by clinisbut

  I'm seeing in my access log a number of request very suspicious: /i /im /imaa /imag /image /images /images/d /images/di /images/dis They part from a known resource (in the above example /images/disrupt.jpg). All comming from same IP. Requests varies from 1/sec to 10/sec, seems somewhat random. It's obviously they are trying to find something and seems they are using a script. How do I block this kind of behaviour? I though of blocking the IP request, at least for a given time. Keeping in mind that: Request intervals seems legitimate (at least I think so). I don't want to end blocking a search engine bot, which may find 404 urls too (and that's a different problem, I know). ¿Do they use always same IP?

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• Is there a correlation between complexity and reachability?

  - by Saladin Akara

  I've been studying cyclomatic complexity (McCabe) and reachability of software at uni recently. Today my lecturer said that there's no correlation between the two metrics, but is this really the case? I'd think there would definitely be some correlation, as less complex programs (from the scant few we've looked at) seem to have 'better' results in terms of reachability. Does anyone know of any attempt to look at the two metrics together, and if not, what would be a good place to find data on both complexity and reachability for a large(ish) number of programs? (As clarification, this isn't a homework question. Also, if I've put this in the wrong place, let me know.)

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