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Articles indexed in April 2012

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• Your experiences with TDD [closed]

  - by SkonJeet

  In your experience, does TDD prove to be a useful approach in all development projects? Do you take the approach of TDD even when working on an existing project? Also, how does mocking tie in with a TDD discipline? I'm not looking for opinions, I'm looking for developers' advice, tips and learning resources regarding TDD's usage based on their experience. I'm going to spend the day equipping myself with enough knowledge about TDD to start making small steps towards using it but I don't know to what extent I should be using it.

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• Does TDD's "Obvious Implementation" mean code first, test after?

  - by natasky

  My friend and I are relatively new TDD and have a dispute about the "Obvious Implementation" technique (from "TDD By Example" by Kent Beck). My friend says it means that if the implementation is obvious, you should go ahead and write it - before any test for that new behavior. And indeed the book says: How do you implement simple operations? Just implement them. Also: Sometimes you are sure you know how to implement an operation. Go ahead. I think what the author means is you should test first, and then "just implement" it - as opposed to the "Fake It ('Till You Make It)" and other techniques, which require smaller steps in the implementation stage. Also after these quotes the author talks about getting "red bars" (failing tests) when doing "Obvious Implementation" - how can you get a red bar without a test?. Yet I couldn't find any quote from the book saying "obvious" still means test first. What do you think? Should we test first or after when the implementation is "obvious" (according to TDD, of course)? Do you know a book or blog post saying just that?

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• What is Pseudocode?

  - by Jae

  I've seen a lot of mentions of Pseudocode lately, on this site and others. But I don't get it: What is Pseudocode? For example, the Wikipedia article below says "It uses the structural conventions of a programming language, but is intended for human reading rather than machine reading." Does this mean that it isn't actually used to make programs? Why is it used? How is it used? Is it considered a Programming Language? See the above Wikipedia quote. Is it commonly known/used? Anything else... I honestly don't know where to start with this. I have Googled it and I've seen the Wikipedia article on the topic, but I still don't fully understand what it is.

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• How can I perform sentiment analysis on extracted text from online sources?

  - by aniket69

  I'm working on extracting the sentiment from YouTube comments, blogs, news content, Facebook wall posts, and Twitter feeds. I'm looking for an automated way to do this: the two third-party solutions I've found have been AlchemyAPI and RapidMiner. Are these the best way to approach this project, or should I be using something else? Is there a more efficient way to approach sentiment analysis? What techniques have worked for you in a project like this?

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• What is the best idea to put available OS (linux) and Web application to client?

  - by Fernando Costa

  After a year programming a web based business management system, I got my idea divided into two differents ways to do what I'm doing... I will try to explain in follow lines: First I will describe my enviroment: Webserver: apache, ngynx Programming Language: PHP, Shell Script, Java Script, SQL Database: Mysql Operating System: Linux, UNIX (All Distros) (If manually configured works on windows) Authentication Server: FreeRadius First situation I have my application running on this enviroment that I had just described before, as my application is a SaaS app, then I have my own server to run it all and customers pay to use it as a service accessed by webbrowser. Second Situation The same as before but with one big difference, everything (environment) is installed in the customer, then I need to cryptography all my codes (It includes PHP and Shell Scripts). I think this situation is most difficulty, but I would like to hear it from different points of view.

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• Does Ubuntu generally post timely security updates?

  - by Jo Liss

  Concrete issue: The Oneiric nginx package is at version 1.0.5-1, released in July 2011 according to the changelog. The recent memory-disclosure vulnerability (advisory page, CVE-2012-1180, DSA-2434-1) isn't fixed in 1.0.5-1. If I'm not misreading the Ubuntu CVE page, all Ubuntu versions seem to ship a vulnerable nginx. Is this true? If so: I though there was a security team at Canonical that's actively working on issues like this, so I expected to get a security update within a short timeframe (hours or days) through apt-get update. Is this expectation -- that keeping my packages up-to-date is enough to stop my server from having known vulnerabilities -- generally wrong? If so: What should I do to keep it secure? Reading the Ubuntu security notices wouldn't have helped in this case, as the nginx vulnerability was never posted there.

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• window decoration command change

  - by Pedro

  I'm quite new to Ubuntu, and I don't know how to fix this: I have been experiencing the problem with window decorations that go away. I have been told that I could correct that with compiz fusion icon, just restarting the graphics whenever it happened. This solution only fixed the problem for like 30 seconds. Then I found out that the command inside the window decorator had changed, so I only had to reset it to default (/usr/bin/compiz-decorator). The only problem is that it keeps changing the command by itself once or twice a day. I can live with that, but I would like to find a more permanent solution, if there is one. I am running Ubuntu 11.10

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• stuck on "preparing..." when restoring from deja-dup backup

  - by Dan

  I'm trying to restore my deja-dup backup from a certain date. However during restore after selecting the date to restore from i get a "restoring... "preparing"..." window that just seems stuck there doing nothing forever (past 1/2 hour). There was a point when i was prompted for the "encryption password" but i don't remember it, so i just entered one. I never got any error if the password i entered was not accepted.

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• Disabling hardware checking in the start up

  - by sven

  I have a ubuntu (10.04) on my desktop and it doesn't have monitor. I would like to connect the desktop (ubuntu) via teamviewer from my laptop. However, when the PC is powered, pc gives an error about it could not find monitor and it gets stuck in this error and does not continue. Since the ubuntu started correclty, teamviewer doesnt start to work on ubuntu so that I can not connect to the ubuntu. How can I disable hardware/desktop checking at the startup, so that ubuntu would start normally then I can use teamviewer?

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• Partitions and cdrom are not mounted, and the bars are missing in Ubuntu 12.04

  - by nuit

  Provide my spec and sorry for my poor English first. MB: Gigabyte G31M-S2L (bios ver. F9) CPU: intel E5200 2G RAM HD1: WD 160G with 2 partitions (partition 1:60G, NTFS, win xp; partition 2:100G, NTFS) HD2: WD 320G with 2 partitions (partition 3:220G, NTFS; partition 4:100G, ext4, Ubuntu) Recently, I tried to install Ubuntu 12.04 Beta 2 on my desktop PC (on partition 4). At the beginning, everything looked great including the auto-mounting of partitions 1~3 and the unity (3D). However, after I deleted and re-allocated the partitions on HD2 and re-installed Ubuntu on partition 4, the partitions 1~3 are no longer auto-mounted when I logged in the desktop (and even the inserted cdrom would not be mounted either), and the launch bar and menu bar in unity (3D) are missing. The configurations during these two installations are all the same as default. Are there any possible reasons or solutions for this issue? Thank you in advance!

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• Torrent clients suddenly stop downloading

  - by Vasilis Baltikas

  A few days ago I noticed, that Transmission in my Ubuntu 10.04 machine suddenly couldn't download anything anymore. To overcome this I have uninstalled and reinstalled Transmission and tried downloading with other clients (Deluge, Vuze) well seeded torrents (ubuntu iso images for example) without success. On the same computer I have also installed Ubuntu 10.10 and Windows 7, which I rarely use. What makes the problem I encounter weirder, is the fact that downloading via torrents works fine in my Ubuntu 10.10 and Windows partitions but not in Lucid Lynx. Browsing the web for similar problems didn't give me answers. Any help would greatly appreciated.

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• Using opencv on 12.04

  - by leighman

  I have some simple opencv files which I wanted to compile on 12.04. I have installed all the -dev packages They use: #include <cv.h> #include <highgui.h> at the top of the file. Using g++ `pkg-config --cflags --libs opencv` canny.cpp gives cv.h: No such file or directory pkg-config seems to list /usr/include/opencv but the directory created at install is /usr/include/opencv2 Is this a bug? Any advice?

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• Can I use VirtualBox as a sandbox for 12.04?

  - by Stephen Myall

  I am quite a cautious person though not afraid to experiment. I currently have 11.10 Unity and 12.04 Beta 2 running on different partitions (no problems). I have learned here that Unity can run in VirtuaBox. When I upgrade to 12.04 LTS later this month, I am curious to understand if I could also run 12.04 in Virtual Box for experimentation and test some things before I implement them into my system? Maybe there is a better way to achieve this, without partitioning my hard drive.

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• Unity very slow while Gnome Classic running just fine

  - by Sorin Sbarnea

  I see tons of people complaining about Unity speed and I think the problem is not with the video drivers. When I login to Gnome Classic the system is behaving just fine, but when on Unity I can barely do use it: windows are moved hard, terminal is damn slow. Is there any solution or bug that I should track? Details Ubuntu 11.10 Two monitors setup Latest Nvidia proprietary drivers (tested with default ones also, no change) 6GB RAM, Xeon @ 2.8 Nvidia Driver 280.13 - Quadro NVS 295 with 8 cores 256MB RAM. lspci | grep VGA 02:00.0 VGA compatible controller: nVidia Corporation G98 [Quadro NVS 295] (rev a1) uname -a Linux sorins 3.0.0-16-generic #29-Ubuntu SMP Tue Feb 14 12:48:51 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

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• Prompt not working when logged in as specific user

  - by Clay

  Hello I am running ubuntu 11.10 and access it via ssh with putty. My problem is that when I log in I get the prompt [email protected]:~$ and my arrow keys do what the y are supposed to. When I try to login in as another user account I made all I get is this as the prompt it never says the directory or anyting $ Also when ever I try to use the left, right, up or down arrow I get a character like this ^[[A Is this a bug in putty or did I just not set the account up right?

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• I've changed default shell but my terminal don't get it

  - by om-nom-nom

  Recently I've changed my default shell from bash to zsh like this: chsh -s /bin/zsh myname But when I invoke a new terminal (e.g. using ctrl+alt+T) I still have bash loaded: myname@machine:~$ cat /etc/passwd | grep myname myname:x:1000:1000:myname,,,:/home/myname:/bin/zsh myname@machine:~$ echo $SHELL /bin/bash zsh is installed and can be explicitly runned with zsh command. How to deal with that?

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• Can only run firefox 8.0 in safe mode [closed]

  - by Max Popp

  This is a recent problem but I have no idea what caused it: I can only run firefox in safe mode. Any other mode, I get a completely khaki, unresponsive screen, that I have to forcibly terminate. I have uninstalled firefox, and then re-installed it via synaptic. That didn't seem to work. The problem occurs in all the four user accounts I have defined in the ubuntu. I am running an ubuntu 11.10, amd64. My firefox is version 8.0.

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• have to plug/un-plug usb devices on system booting?

  - by user866581

  it's so weired that i have to plug/unplug in my usb devices every time booting ubuntu. it happens for both installing ubuntu and booting ubuntu (10.10 and 11.10) the scenario is like: 1.bios checking - 2.grub start - 3.keyboard & mouse led OFF (black screen with a cursor on top-left) - 4.i plug/unplug in any usb devices - 5.everything is back to normal and ubuntu started it's really frustrating :( please advise the solution.

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• Module loaded even though it's blacklisted

  - by isakkarlsson

  System: Ubuntu 11.10 Linux gray 3.0.0-12-generic #20-Ubuntu SMP Fri Oct 7 14:50:42 UTC 2011 i686 i686 i386 GNU/Linux I'm trying to blacklist a module (rt2800usb among other) like; $ lsmod | grep rt rt2800usb 22300 0 rt2800lib 48717 1 rt2800usb crc_ccitt 12595 1 rt2800lib rt2x00usb 20092 1 rt2800usb rt2x00lib 48114 3 rt2800usb,rt2800lib,rt2x00usb mac80211 272785 3 rt2800lib,rt2x00usb,rt2x00lib cfg80211 172392 2 rt2x00lib,mac80211 $ emacs /etc/modprobe.d/blacklist.conf and add: blacklist rt2800usb blacklist rt2800lib blacklist rt2x00usb blacklist rt2x00lib and then: $ sudo update-initramfs -u $ sudo reboot But the module are loaded after reboot: $ lsmod | grep rt rt2800usb 22300 0 rt2800lib 48717 1 rt2800usb crc_ccitt 12595 1 rt2800lib rt2x00usb 20092 1 rt2800usb rt2x00lib 48114 3 rt2800usb,rt2800lib,rt2x00usb mac80211 272785 3 rt2800lib,rt2x00usb,rt2x00lib cfg80211 172392 2 rt2x00lib,mac80211 How do I make the changes persist (i.e. have the modules blacklisted) after reboot?

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• Ricoh Aficio 1515ps - How can I get the scanner to scan? (printing works)

  - by nutty about natty

  For similar screenshots and story, see: How to define my Samsung SCX3200 multifunction printer? and for a possible solution: How can I get an Epson TX560WD scanner working? Thanks! Edit n°1 installed xsane (via Ubuntu Software Center), launched it and get the following: Clicking on "Help" yields: I tried 4) man sane-dll which yields No manual entry for sane-dll I uninstalled "Simple Scan": didn't help. I tried 3) but aborted due to unsettling warning ;) wasn't that brave (or desperate). Maybe it's due to 1) and I'm stuck with it? Is it really not possible that a driver for either Windoze or Mac OS would also support scanning via Ubuntu? Edit n°2 Resorted to Windows XP and the Network TWAIN Driver ScanRouter or the "lite" version (which I found elsewhere) might also work (under Linux??); but it's more than I need. Thought about WINE, but also that seems to rely on SANE... So still no luck with this device's scanning capabilities with Linux (but good enough (via xp) for my purposes)...

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• Which hosted ecommerce solutions allow customization?

  - by Diego

  Following my previous question, I'm now evaluating the possibility of using a hosted platform for the ecommerce project I have to implement. Before I start "playing" with each one of them, I'd like ask if anybody knows which ones allow a good degree of customization. At the moment I'm looking at BigCommerce, but it seems that customization is limited to templates, while I need additional features which require PHP Coding. Also, I'd need to be able to import additional product data into the system, and I'd need to do this via code; I had a look at some integrations, but they gave me the impression that they all run on the rendered page via JavaScript. For example, if I want to show Facebook Reviews on a product, I'll have to add some JS that will fetch it and show it on the page. This is not optimal, as I must cater for people with JS disabled, therefore I'd need to run my own PHP code. Thanks again for all the opinions.

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• How to interpret Google's "Avg. Page Load Time"?

  - by hawbsl

  Is there any industry rule of thumb for what's considered an unacceptable load time v. an OK one v. a blistering fast one? We're just reviewing some Google Analytics data and getting 0.74 Avg. Page Load Time reported. I guess that's OK. However it would be good if some meatier comparison data were available, or a blog post, or somewhere where there's some analysis of what speeds are generally being achieved by various kinds of sites. Any useful links to help someone interpret these speeds? If you Google it you just get a lot of results dealing with how to improve your speed. We're not at that stage yet.

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• Confirm that a dns zone is served by a nameserver

  - by adam

  We currently have a domain which has custom nameservers. Our host has their own nameservers. I'd like to switch our domain to use our host's nameservers for a while. Our host tells me that their nameservers hold a replica of our dns zone, but I'd like to confirm this before I switch. Is there a command line tool I can use that I can use to answer the question "does this nameserver know the dns zone of this domain?" Hope that makes sense! Thanks, Adam

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• Bizarre image loading problem from apache2

  - by NateDSaint

  Users have complained a few times about seeing a bizarre set of pink or green stripes on our webpage. At first I thought there were a rash of video card outages, but then someone sent me a screenshot from their browser (IE8). I later saw the same thing, but with slightly different colors on Chrome. Users have experienced this on their iPads and iPhones (iOS Safari). Because I've optimized the site to cache images, the bad image stays around until you clear your cache, so once you do, it resolves itself. My assumption is that the transmission of the image is being cut off mid-stream and then staying that way, but I can't for the life of me figure out why. Here's what I've checked: Header length is being sent, and transmission looks okay (wget sample below): wget http://www.superiorlivestock.com/templates/sla2/images/wallbg2.jpg --2012-04-05 08:46:00-- http://www.superiorlivestock.com/templates/sla2/images/wallbg2.jpg Resolving www.superiorlivestock.com (www.superiorlivestock.com)... [ip redacted] Connecting to www.superiorlivestock.com (www.superiorlivestock.com)|[ip redacted]|:80... connected. HTTP request sent, awaiting response... 200 OK Length: 45926 (45K) [image/jpeg] Saving to: `wallbg2.jpg' Images are not being served gzipped (apache conf below): SetOutputFilter DEFLATE SetEnvIfNoCase Request_URI \.(?:gif|jpe?g|png)$ no-gzip dont-vary The site is www.superiorlivestock.com, and here's a sample of the bad page load: Is there something obvious I'm missing? Am I saving my images in the wrong format somehow?

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• Disqus Comment Form Missing from Posts

  - by Saad

  I decided to transition from IntenseDebate to Disqus for the blog. So I uninstalled ID via their uninstall process (you upload the template to them, they remove code, you reupload your new template onto the site). Then I went to install Disqus into the site through their Blogger widget method. The problem is that there is no comment form present on any of the blog posts' pages. For example, when you click on the 'Comments' link it jumps to #disqus-thread but there is no thread there. So is there any fix that I can do in order to make the comment form appear? I checked Disqus' knowledgebase for Blogger installation but as far as I can tell my template should be compatible.

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