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• Real-time chat in Ruby on Rails

  - by Skydreamer

  First, I'm sorry because I know this question has been asked many times but I'm still looking forward to finding the answer to my problem. I'd want to implement a Real-time chat for my Rails app but I can't really host the server which handles the sockets. I've tried Faye but it needs a server. I've also heard of pusher but it's limited to 20 users at a time on the chat and I can't really be sure they won't be more. I've thought of irc but I think I can't really embed it into a rails app, maybe it needs sockets... So here's my problem, can I implement a real-time chat without owning a server ? What can you advice me ? Thank you for your answers.

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• Efficiently representing a dynamic transform hierarchy

  - by Mattia

  I'm looking for a way to represent a dynamic transform hierarchy (i.e. one where nodes can be inserted and removed arbitrarily) that's a bit more efficient than using a standard tree of pointers . I saw the answers to this question ( Efficient structure for representing a transform hierarchy. ), but as far as I can determine the tree-as-array approach only works for static hierarchies or dynamic ones where nodes have a fixed number of children (both deal-breakers for me). I'm probably wrong about that but could anyone point out how? If I'm not wrong are there other alternatives that work for dynamic hierarchies?

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• How do I fix gnome shell themes?

  - by Chris

  This is my fifth full format and install of Ubuntu in under a month. I finally have my Gnome 3 desktop working again, but again, the Gnome shell themes is not select-able. I have asked the question of how to fix this common issue before, but I have seen no positive resolution. Does anybody know of a simple fix? This is a common issue and I have seen hundreds of postings related to it, but other users only seem to get half-way answers also and it goes unresolved. Would it be advisable to completely purge Gnome desktop and reinstall? If so how would I do this? I cannot use any extensions if the shell is not working, so I am desperately seeking resolution for the issue. Thanks in advance.

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• Proprietary AMD driver freezes my Ideapad

  - by mote

  I got this problem that I can't figure out what to do about. On Ideapad s205 with Ubuntu 12.04* (64), if I install Catalyst Centre 12.1 or newer it Freeze (lock's up), 1-3 times a day. It doesn't suffer freezing when using Radeon driver, but Radeon driver are considerably slower and flickers, so I would really prefer the proprietary driver (with no freezing). I reported the bug to launchpad but it doesn't get attention. -Also tried Ubuntu forums. Reported bug to AMD bug site "http://ati.cchtml.com/", but I don't think anybody reads it. Wrote AMD support several times, but get silly answers like "reinstall Windows". -Asked them to send the bug to Linux driver developers, but never heard a thing (more than once). The same nothing happens when writing to the feedback link from AMD driver download site. I'm so frustrated here, any advice would help. Thanks (*The same on Ubuntu 11.10)

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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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• What is the easiest (preferably) graphical way to clone a hard drive to an image that I can open later?

  - by Roland Taylor

  I need to make a (preferably) mountable image of an 80GB Hdd, and store it on another hard drive. Is there some way that I can do this without losing data? Thanks for the answers I've received so far. The system in question cannot be used right now due to a problem with the power button :( [ugh!], but the information will really be useful =)! Thanks to all who answered so far, if anyone else wants to give me some tips I'll leave this open for a bit, as I still have not yet been able to clone the drive.

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• Best URL for cars related website? [duplicate]

  - by Claudio ??is Mulas

  This question already has an answer here: What is the best stucture of SEO friendly URL? 3 answers If this was your website, what will be the URLs for each car on sale? http://www.autoscout24.eu/Details.aspx?id=247572735&asrc=ha I'm working on a car dealership website. What should be the best URL? Consider also that the company can have more models of the same car. I'm not asking for a url scheme, there are a lot of similar questions. My question is: in a car dealership website what is the best url for a car? What are by you the best variables I've to put on the url. Brand, model, year, location, color, miles/km, etc. This website, that url, this particulary case: what will you choose for urls? (even not in the following list) audi_q5_2009.html audi_q5_2009_used.html audi_q5_2009_used.html audi_q5_2009_used_in_alcobendas.html audi_q5_2009_used/247572735.html

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• What is the difference between sudo X and running X as root?

  - by Raffael

  My question is asking regarding a specific observation that I would like to understand. I just tried to install the package rJava in R and failed even though I prefaced the installation as suggested by the manual with: sudo R CMD javareconf Then I came across this comment: Using sudo and running as root are not exactly the same thing. – Jon7 Desparate as I was I tried it: sudo su R CMD javareconf And to my surprise I suddenly could install that package. Sorry for the lenghty introduction but I wanted to give you a context to prevent answers like here. The question does not aim at specifically the described observation - rather at those "things" in general on Ubuntu. My question is: How could this be possible? What is the difference between sudo X and runnding X as root?

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• How do I explain the importance of NUNIT Test cases to my Colleagues [duplicate]

  - by JNL

  This question already has an answer here: How to explain the value of unit testing 6 answers I am currently working in Software Development for applications including lot of Mathematical Calculations. As a result there are lot of test cases that we need to consider. We donot have any NUNIT Test case system, I am wonderring how should I get the advantages of implementing the NUNIT testing in front of my colleagues and my boss. I am pretty sure, it would be of great help for our team. Any help regarding the same, will be higly appreciated.

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• How to list user installed applications (not packages)?

  - by Bucic

  Not packages and not all applications. Just the applications user installed by himself from whatever source (Software Center, manually added PPA, etc.). If the above is not possible - a list of all installed applications or at least a GUI which lists the applications so I can take screenshots of it. I've read a dozen of similar questions and people posting answers usually don't even get close to OP question merit. Please note that my question includes 'user installed'. Answer: It is not currently possible in Ubuntu Linux. (choosing tijybba's answer as the closest one though)

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• Oracle Data Integrator Demo Webcast - Next Webcast - November 21st, 2013

  - by Javier Puerta

  Oracle Data Integrator Demo Webcast Next Webcast - November 21st, 2013 The ODI Product Management team will be hosting a demonstration webcast of Oracle Data Integrator regularly. We will be showing baseline functionality, and covering special topics as requested by our customers. Attendance to these webcasts is open to customers and partners Webcast Format The same format for the Webcast will be followed for each presentation: 05 minutes - Background & Overview 30 minutes - Introduction to ODI Features 15 minutes - Drill-Down into Special Topics 10 minutes - Questions and Answers Next Webcast Special Topics Oracle Data Integrator 12c Webcast Details Thursday November 21st 2013, 10:00 AM PST | 1:00 PM EST | 6:00 PM CET (1 hour) Web Conference Link: 594 942 837 (https://oracleconferencing.webex.com) Dial-In Number: AMER: 1-866-682-4770 (More Numbers) Phone Meeting ID/Passcode: 3096713/505638 More information on Oracle Data Integrator (ODI) Learn more about Oracle Data Integrator. Download Oracle Data Integrator 12c. Oracle Data Integrator Webcast Archive Copyright © 2013, Oracle. All rights reserved. Contact Us | Legal Notices and Terms of Use | Privacy Statement

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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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• Which version of Ubuntu is recommended for app developers?

  - by Wes

  I've searched around Ask Ubuntu and the App Developer site, but I can't seem to find the answers to my questions. I'm wanting to get back into programming, and I'd eventually like get into app development for Ubuntu, but I'm not sure where to get started. Which version of Ubuntu is currently recommended for app development, especially for those wanting to publish their apps to the Software Centre? Should app developers use the current LTS release, or, can any of the new releases be used? Should developers use the 32-bit or 64-bit edition of Ubuntu, or does this not matter? What effect would the above choices have on the eventual publication of an app? I'm truly sorry if this has been covered elsewhere. Cheers Wes

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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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• URL SEO : Using directories or exact keyword phrase in the URL [duplicate]

  - by rahul14gt

  This question already has an answer here: What is the best stucture of SEO friendly URL? 3 answers I am trying to understand how to best optimise a url for a page to rank high for specific keywords. Example: a top keyword search is "rental properties in new york". Question is does this keyword need to appear as this exact phrase in the url or should it be broken up into different directories for a better structure e.g.: www.abc.com/en/properties/new-york/rental OR www.abc.com/en/rental-properties-in-new-york Which will help the page rank higher (given all other things on the page are exactly the same)? Thanks!

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• Help with Kodak esp 3250 printer driver on Lubuntu 12.1 SOLVED!

  - by user108608

  First my system: pentium 4 -don't remember the speed-, 1g ram, dual boot to separate physical drives, Fdos and Lubuntu 12.1 second my lan: I have four computers operating for the same printer. 1. Intel quad core i5, 4g ram, running Windoze 7 64 bit, printer connected and shared from here. Kodak ESP 3250 2. Gateway 17" laptop running Windoze 7 32bit 3. Asus tablet (small laptop) running Lumbutu 12.1 4. My dual boot system running Fdos and Lubuntu 12.1 The problem: I downloaded c2esp_25c-1_i386.deb, tried to install it using DEBI Package Installer, it loads the files, looks for cups driver and ends with an error: "Dependancy is not satisfiable: libcupsdriver1 (=1.4.0)" What do I do now? Is there some place that I can get the correct cups driver? further information: The Asus tablet was running Ubuntu 12.1 (very slowly and with a few crashes) and could print from the lan printer with no problems. Is there something in Ubuntu that can be loaded into Lubuntu? noobee user hoping for answers, Paul

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• Is there a simple, safe way to trigger a GPU lockup on a susceptible computer?

  - by Abe

  Answers to my previous question, Ubuntu 12.04 froze, requiring powercycle. What should I look / grep for in the logs?, have led me to suspect that my computer is experiencing an intermittent GPU lockup. It has been happening about once a week, usually when I am using Chrome. Today it happened when I was creating a diagram on lucidchart I have a Dell Optiplex 755 with an ATI Radeon HD 2400 XT and dual monitors running in Xinerama mode. I am using 12.04 with the proprietary ATI driver installed. When the computer locks-up, I can still ssh in. And I would like to follow the instructions on reporting this provided at https://wiki.ubuntu.com/X/Troubleshooting/Freeze Is there a (safe) way to cause a GPU lockup so that I can go ahead and file a bug, rather than waiting until it happens again?

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• Mythbusters- Programming/hacking myths [closed]

  - by stephen776

  Hey guys. I am a big fan of the Discovery show Mythbusters, as Im sure some of you are as well. I have always wanted them to do an episode on programming/hacking. They get a lot of their show ideas from fans so I though we could compile a list of possible myths to bust. Lets hear your ideas! (sorry if this is not appropriate, close if necessary) Edit: I am not necessarily looking for subjective "This is what I want to see" answers. I am talking more along the lines of interesting computer/programming/hacking stories that would appeal to a general audience. I do not expect them to do a show on "Whats faster i++ or i + 1".

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• which is the best CMS for building a Video tutorial website? [duplicate]

  - by Rajesh Sankar R

  This question already has an answer here: How to choose a CMS system for a small web site? 4 answers I am planning on setting up a website where I will be posting "how to or training videos" for various softwares. There will be several training videos under a single topic. And there will be several topics under a single software training. Similar to lynda.com but in a small scale. Can you suggest me a CMS for the job? Initially I am planning on hosting videos on YouTube and linking them to my website. But, I will be moving to my own hosting later on. It must be customizable, scalable, and most of all OPEN SOURCE

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• Are log records removed from ldf file for rollbacks?

  - by TiborKaraszi

  Seems like a simple enough question, right? This question (but more targeted, read on) was raised in an MCT forum. While the discussion was on-going and and I tried to come up with answers, I realized that this question are really several questions. First, what is a rollback? I can see three different types of rollbacks (there might be more, of course): Regular rollback, as in ROLLBACK TRAN (or lost/terminated connection) Rollback done by restore recovery. I.e., end-time of backup included some transaciton...(read more)

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• How to reset the Xorg / xserver?

  - by thomas

  xserver keeps crashing on my general user account both in unity 3d and 2d. It doesn't do it on the guest account. That's why I want to reset / rollback everything xserver related, hoping this is going to fix it. Most answers on this involve sudo dpkg-reconfigure xserver-xorg. However, this does nothing for me (generates no output) and I read in other forums, that it's deprecated. So, what's the current way to reset all xserver / xorg options; what's the alternative to sudo dpkg-reconfigure xserver-xorg ? Thanks Edit: X crashes during work, not before login or so. And the effect of a crash is, that I get thrown out of the session, not a freeze or machine crash.

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• INNOVATIONS IN PRODUCTS – Partner Briefing PROGRAM - October 1st

  - by Mike.Hallett(at)Oracle-BI&EPM

  Partners are invited to join the Innovations in Products webcast, October 1st: 4:00pm CET /5:00pm UK BI & EPM Product breakout Webcast sessions available on October 1st: Topics Speaker To Register Oracle Endeca Information Discovery, Product Overview Emma Palii, BI Sales Consultant CLICK HERE Hyperion Project Financial Planning, Measure the full financial impacts of your Projects Olivier Bernard, EPM Business Solutions Director CLICK HERE To see the full list of session topics, goto the overall registration page Innovations in Products October 1st.    To access the previously presented Applications, and Public-Sector Value Proposition presentations, please click here. Delivery Format: 1 Hour Webcast The Innovations in Products program is a series of Oracle product presentations followed by live Q&A.  It will be delivered over the Web.  Partner Participants have the opportunity to submit questions during the web cast via chat and subject matter experts will provide verbal answers live. For further information please contact Markku Rouhiainen.  

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• Need a graphical renaming tool which can rename files recursively

  - by user37991

  ATM I am forced to use freeware in Windows to rename SOME Linux data files. Linux also creates files like "Filename.ext" as being different to "filename.ext", and !@#$hg".ext ... which cannot be recognized by Windows. "pyrenamer" ... mentioned in another answer cannot auto-rename more than the one immediate folder. I use Ubuntu, not ARCH linux, because I am not CLI. Despite some answers here (designed by and for CLI programmers), how can Ubuntu GUI (not CLI) do file renaming? BTY: in ONE folder only, THUNAR is far better than silly pyrenamer. But Thunar cannot auto-rename recursively.

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• Need new developers-laptop, with ubuntu. Multiple ext displays, ssd, dock, NO DVD [closed]

  - by Ole Morten Amundsen

  I'm having a really hard time finding a great alternative for Macbook Pro (I have a MB pro '08). I'd like to return to ubuntu and need a kick-ass laptop. If you help, you've lead me back to linux :) Req: ubuntu friendly lots of memory 8G+ ssd 160GB+ great processor (intel sandy?) connect up to three external displays. this triple display looks cool No optical drive, NO DVD 13-17" dock. In place of the ridiculous optical drive (It's like having a floppy drive IMO): extra battery? 2nd ssd? extra graphics card? your suggestion The laptop should be designed for not having dvd. I can't find many, unless they are tiny 11"... I'm exited to know your answers!

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• How To Create a Full Android Phone or Tablet Backup Without Rooting or Unlocking Your Device

  - by Chris Hoffman

  Android includes a built-in way to back up and restore the contents of your phone or tablet. All you need is a computer and a device running Android 4.0 (Ice Cream Sandwich) or newer. We’ve also covered backing up and restoring your Android phone with Titanium Backup. Titanium Backup is a great app, but it requires rooting your Android. This feature isn’t exposed in Android’s user interface, so you should consider it experimental. 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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