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Articles indexed in July 2012

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• UI message passing programming paradigm

  - by Ronald Wildenberg

  I recently (about two months ago) read an article that explained some user interface paradigm that I can't remember the name of and I also can't find the article anymore. The paradigm allows for decoupling the user interface and backend through message passing (via some queueing implementation). So each user action results in a message being pased to the backend. The user interface is then updated to inform the user that his request is being processed. The assumption is that a user interface is stale by definition. When you read data from some store into memory, it is stale because another transaction may be updating the same data already. If you assume this, it makes no sense to try to represent the 'current' database state in the user interface (so the delay introduced by passing messages to a backend doesn't matter). If I remember correctly, the article also mentioned a read-optimized data store for rendering the user interface. The article assumed a high-traffic web application. A primary reason for using a message queue communicating with the backend is performance: returning control to the user as soon as possible. Updating backend stores is handled by another process and eventually these changes also become visible to the user. I hope I have explained accurately enough what I'm looking for. If someone can provide some pointers to what I'm looking for, thanks very much in advance.

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• What is a user-friendly solution to editing email templates with replacement variables?

  - by Daniel Magliola

  I'm working on a system where we rely a lot of "admins / managers" emailing users from the database. One of the key features is being able to email several people at the same time, with specific information relevant to each of them. Another key feature is to be able to hand-craft emails, because it tends to be be necessary to slightly modify them each time, but having a basic template saves a lot of time. For this, we have the typical "templates" solution, where we have a template that looks kind of like this: Hello {{recipient.full_name}}, Your application to {{activity.title}} has been accepted. You have requested to participate on dates {{application.dates}}, in role {{application.role}} Blah blah blah The problem we are having is obviously that (as we expected), managers don't get the whole "variables" idea, and they do things like overwriting them, which doesn't let them email more than one person at a time, assuming those are not going to get replaced and that the system is broken, or even inexplicable things like "Hello {{John}}". The big problem is that this isn't relegated, as usual, to an "admin" section where only a few power users have access to editing the templates that are automatically send out, and they're expected to know what they are doing. Every user of the system gets exposed to this problem. The obvious solution would be to replace the variables before showing this template for the user to edit, but that doesn't work when emailing several people. This seems like a reasonably common problem, and we are kind of hoping that someone has already solved it. Have you seen anywhere/created/can think of good solutions to this problem?

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• The most mind-bending programming language? [closed]

  - by Xepoch

  From a reasonably common programming language, which do you find to be the most mind-bending? I have been listening to a lot of programming podcasts and taking some time to learn some new languages that are being considered upcoming, and important. I'm not necessarily talking about BrainFuck, but which language would you consider to be one that challenges the common programming paradigms? For me, I did some functional and logic (ex. Prolog) programming in the 90s, so can't say that I find anything special there. I am far from being an expert in it, but even today the most mind-bending programming language for me is Perl. Not because "Hello World" is hard to implement but rather there is so much lexical flexibility that some of the hardest solutions can be decomposed so poetically that I have to walk outside away from my terminal to clear my head. I'm not saying I'd likely sell a commercial software implementation, just that there is a distinct reason Perl is so (in)famous. Just look at the basic list of books on it. So, what is your mind-bending language that promotes your better programming and practices?

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• What is the best objective way to measure language popularity trends? (What's better than TIOBE?)

  - by Eric Wilson

  The best way to get data on computer language popularity that I know is the TIOBE index. But everyone knows that TIOBE is hopelessly flawed. (If someone provides a link to support this, I'll add it here.) So is there any data on programming language popularity that is generally considered meaningful? The only other option I know is to look at the trends at indeed.com, which is inherently flawed, being based on job postings. It isn't like I would make a future language decision solely based on an index, but it might provide a useful balance to the skewed perspective one obtains by talking to ones friends and colleagues. To illustrate that bias, I'll point out that based on the experience of those I personally know, the only languages used professionally today (in order of popularity) are Java, C#, Groovy, JavaScript, Ruby, Objective C, and Perl. (Though it is evident that C, C++ and PHP were used in the past.) So my question is, everyone bashes TIOBE, but is there anything else? If so, can anyone explain how we know the alternative has better methodology? Thanks.

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• Often "running in low-graphics mode” with NVidia GeForce GT 430

  - by user42228

  Often (every fifth time perhaps) when I turn on my system, I'm greeted with the "running in low-graphics mode” window. Sometimes all I have to do is reboot and the system will start correctly, sometimes there can be a longer series of failed starts. If I go to the terminal and log in, I can run startx and my desktop will appear without problems. At the end of /var/log/Xorg.1.log I see this: [ 77.459] (EE) Screen(s) found, but none have a usable configuration. [ 77.459] Fatal server error: [ 77.459] no screens found [ 77.459] Please consult the The X.Org Foundation support at http://wiki.x.org Is the NVidia creating the appropriate XOrg configuration dynamically on every boot, or what could explain that the configuration error above only occurs sometimes?

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• Encryption Password help!

  - by Carlos L.

  Ok so let me summarize this up. I encrypted my Home to protect against hackers of course when I first installed Ubuntu. It loaded up the Terminal and was attempting to show me my encryption password incase it ever needed to be used. So I thought "Ehh what the heck, I can find it out later..." So I closed Terminal and went on with the (amazing!) Ubuntu life. But now I am having to install Java JDK 7.0.0.4 onto my computer to ya know, play games and such. But it is asking for my password for the encrypted Home folder but it never gave it to me... HELP!!! Does anyone remember the command for Terminal to give you you're randomly generated Encryption password pop up on the famous purple window? Please give legitimate answer and fast please!

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• How to identify doc, ppt, xls files

  - by Shelby. S

  So I was wondering how would you differentiate ppt, xls and doc files from each other in linux regardless of extensions. I tried 'file' but from the looks of it, all of MSOffice files are categorized under the same file type. Similarly I'm having trouble with docx, xlsx and pptx files, since they're essentially all zip files containing a bunch of xml. Thank you for your help! P.S. I also tried a python script importing the magic module, but no go.

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• Mouse and keyboard focus problem

  - by heffaklump

  I have two Chrome windows side by side. I click a link in window#1, ok. Now I want to switch to window#2 and click anywhere in the window. Noting happens. Sometimes the cursor switch to make-bigger-window style. If I click in the top part of current window. And then in the top part of next window I can switch focus so the other window works. Another problem is that the keyboard focus can get stuck in one window. I can click on things in one window but when using the keyboard it will change the first window. Only by closing the window that has the focus, it will release keyboard. What is this madness? Another problem not related is that sometimes I get logged out. Just like that.

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• No sound in any web browser(s)

  - by shaneo

  Hello I recently tried to compile and update alsa from source via this guide http://www.stchman.com/alsa_update.html. Afterwards the sound in any web browser I open Firefox, Opera, Chrome, Chromium, Iron there is no sound on any pages. I went back through the script listed on the site and found where it had installed the drivers and deleted it and than re-installed alsa via synaptic. Though I still have no sound in my browser(s). All system sounds work as they are supposed to only web sounds don't work. Here is my alsabase.conf http://paste.ubuntu.com/1073135/ also a snapshot of alsamixer Any assistance would be greatly appreciated. Thank You and let me know if any more information is required.

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• disk space worngly displayed after installing LVM disk

  - by Ubuntuser

  I installed ubuntu server using LVM partitioning on a 1 TB hard disk. However, after installation, i can only see 10 Gig space here is the fidsk output ` # fdisk -l Disk /dev/sda: 1000.2 GB, 1000204886016 bytes 255 heads, 63 sectors/track, 121601 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00041507 Device Boot Start End Blocks Id System /dev/sda1 * 1 10 71680 83 Linux Partition 1 does not end on cylinder boundary. /dev/sda2 10 121602 976689152 8e Linux LVM Disk /dev/dm-0: 10.7 GB, 10737418240 bytes 255 heads, 63 sectors/track, 1305 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Disk /dev/dm-0 doesn't contain a valid partition table Disk /dev/dm-1: 2147 MB, 2147483648 bytes 255 heads, 63 sectors/track, 261 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Disk /dev/dm-1 doesn't contain a valid partition table You have new mail in /var/mail/root and df -h output df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/system-root 9.9G 6.6G 2.8G 71% / devtmpfs 1.9G 232K 1.9G 1% /dev tmpfs 1.9G 4.0K 1.9G 1% /dev/shm /dev/sda1 68M 22M 43M 34% /boot tmpfs 6.0G 0 6.0G 0% /var/spool/asterisk/monitor You have new mail in /var/mail/root ` any way to increase this space without reisntalling?

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• Cron job running successfully suddenly reports script is not found

  - by Ted B

  What might cause cron to suddenly report a file it is supposed to run is "not found," when the file hasn't been touched, and in fact, the entire system hasn't been touched since it last ran successfully? I have a cronjob schedule I define by doing sudo crontab -e In it, I have dozens of cron jobs that run successfully.. I do not have a PATH specified, and I use absolute paths to call all my scheduled scripts, setting the PATH in them as needed. I do not specify a SHELL in the crontab. All scripts identify the shell as their first line. Without me touching the system, a particular job defined in the middle of other jobs will suddenly stop running. To debug this, I added an output redirection to a log file. In that, the output clearly shows the output of the script successfully running time after time for weeks, and then suddenly the following appears: /bin/sh: /home/iupress/bin/sync-email_images: not found /bin/sh: /home/iupress/bin/sync-email_images: not found /bin/sh: /home/iupress/bin/sync-email_images: not found /bin/sh: /home/iupress/bin/sync-email_images: not found /bin/sh: /home/iupress/bin/sync-email_images: not found /bin/sh: /home/iupress/bin/sync-email_images: not found /bin/sh: /home/iupress/bin/sync-email_images: not found /bin/sh: /home/iupress/bin/sync-email_images: not found /bin/sh: /home/iupress/bin/sync-email_images: not found If I do the ls command, copying and pasting that exact path from the error message, it clearly reports the file is still there (no surprise). Yet the log continues to report that file is "not found" until I take action. I can run the script manually and it runs just fine. If I do sudo crontab -e and save the file, the job runs on the next scheduled time, putting its output in the log, no longer reporting the script is "not found". It seems to me the contents of the script trying to be run are irrelevant since cron doesn't even process the file because it is "not found". I have a job scheduled below the one that is encountering this problem that I know is continuing to run, because I have its output mailed to me. So I know cron is running and continues to run at least one other job, even after it suddenly reports this job's script is "not found". All my lines end with a newline. I had no periods in the crontab until I added the redirection to a log file. I have now added a PATH specification, but left the absolute paths in the jobs. Unfortunately, I have no idea if and when this problem will occur. It will likely be weeks from now. By the way, I am running a script to syncronize the clock, and I see the time is exactly what it should be.

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• Where to find gtx560Ti driver for ubuntu 12.04?

  - by sam

  I found in this nvidia link : http://www.nvidia.com/object/linux-display-amd64-295.59-driver.html It says Linux x64 (AMD64/EM64T) Display Driver Version: 295.59 Certified Supported: NVS 5400M NVS 310 Quadro 410 GeForce GT 620M GeForce GT 640M GeForce GT 640M LE GeForce GT 650M GeForce GTX 660M GeForce GTX 670M GeForce GTX 675M GeForce GTX 555 GeForce GTX 560 SE GeForce GT 415 GeForce GTX 460 v2 Is that driver support for gtx560Ti? If not ,where is the proper driver? (I don't want to use the driver in ubuntu settings) Thank you~

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• Update errors on Xubuntu12.04

  - by Kris Everett

  I'm trying to install updates via the Update Manager, and I got this error: The Package system is broken Check if you are using third party repositories. if so disable them, since they are a common source of problems. Furthermore run the following command in a Terminal: apt-get install -f When I run apt-get install -f, I get: E: could not open lock file /var/lib/dpkg/lock - open (13: Permission Denied E: Unabvle to lock administration directory (/var/lib/dpkg/), are you root? What is wrong? How do I fix it? Why does this happen?

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• /dev/sda1 100% Mysql to blame?

  - by SJP

  I have a an API running that receives raw binaries, processes them, and then stores metadata about the bins in a mysql database. I have been running it for a couple days on a VM. Today the API stopped processing the mySQL commands. After using the command df-h the results were: root@mwdb1:/# df -h Filesystem Size Used Avail Use% Mounted on /dev/sda1 104G 99G 0 100% / udev 16G 4.0K 16G 1% /dev tmpfs 6.3G 364K 6.3G 1% /run none 5.0M 0 5.0M 0% /run/lock none 16G 0 16G 0% /run/shm /dev/sdb1 5.5T 42G 5.2T 1% /data sda1 is at 100%

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• 12.04 LTS Apache2 writing files from webpage at runtime has no effect - possible read/write permissions?

  - by J Green

  I'm running 12.04LTS with Apache and Mono in VirtualBox, with the goal of hosting a web app (coded in ASP.NET and C#) on my local network. The scripts on the page are able to successfully read from text files in the same directory as my site (/var/www/mysite/) but do not seem to be able to write. I'm sure the code works, because it did with my testing in Visual Web Developer on Windows. I don't get any errors, but when I click the button on the loaded webpage, the text file in question does not change. I'm fairly new to Linux in general, so I'm not too familiar with how to set permissions properly, and it may be a permissions issue. Unfortunately, I have searched all over the internet and haven't found a solution that worked, but I've tried (perhaps incorrectly) changing the owner of the files in question to www-root, changing the mode to a+rw, but sadly to no avail. I have tried everything here but it doesn't work: Whats the simplest way to edit and add files to "/var/www"? I hope someone can help me out.

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• How do I make Chromium use Flash from Google Chrome?

  - by Ubuntuser

  Now, that Adobe has stopped issuing new releases for Linux desktops, the only option for users is to use Google Chrome, for those who want to use the latest Flash updates. I use Chromium. Is there any way to get Chromium use the Flash from Google Chrome? The reason I as this question is that I have noticed both these browsers run in the background, so technically, the browsers' plugins are available to use.

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• How do I install drivers for a Konica Minolta 200?

  - by th3pr0ph3t

  This copy machine / scanner / network printer works with Windows but no drivers are available for linux. When Ubuntu supports a printer it works fine but this one is not supported. I found the drivers in: http://onyxftp.mykonicaminolta.com/download/SearchResults.aspx?productname=bizhub%20200 //But I don't know how to install them, nor which one to download. //How can I install this driver? EDIT: The file with the driver is here http://onyxftp.mykonicaminolta.com/DownloadFile/Download.ashx?fileid=18571&productid=865 Inside the archive there is a .deb package that installs correctly but doesn't work. So far the question is: "How can I make it work?"

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• How do I rip a dvd including menus and extras to a menu driven divx file (or any lossy format that supports menus)?

  - by John Baber

  I am asking exactly this question for the same reason, but would like to archive dvds as small, low quality video, while preserving the menu choosing experience. I would like to rip my dvds to something that has the same menus but whose video is in a much more compressed format. I do not want to copy a dvd to an .iso image. How can this be done in the most automatic (hopefully CLI) way possible? Any format is fine so long as playback on linux is possible.

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• Is there a version of Chrome or Chromium whose bookmarks are visible to the HUD?

  - by Isaac

  I noticed that Firefox has bookmarks that can be executed in the HUD. Love it! Chrome and Chromium, which run javascript apps much faster for some odd reason, allow for history to be called through the HUD, but not bookmarks. This wouldn't be a problem if ALL history was callable, but it seems that Chrome LIMITS the amount of history visible to the hud. Is there a version of chrome or chromium that will see our bookmarks?

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• Wireless is disabled by hardware switch on Dell Inspiron 1750

  - by lowerkey

  I have a problem where Ubuntu (12.04) says there is a wireless network card, but it is disabled by a hardware switch. How do I turn it on? I checked the BIOS, and the wireless card is enabled there. Fn + F2 was also no success. The results of rfkill list: 0: brcmwl-0: Wireless LAN Soft blocked: no Hard blocked: yes 1: dell-wifi: Wireless LAN Soft blocked: yes Hard blocked: yes sudo rfkill unblock wifi did nothing to the Wireless Status.

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• How to customize the initrd embedded in or coming with the kernel image

  - by STATUS_ACCESS_DENIED

  I would like to add some tools and not just kernel modules into the initrd (initramfs-based). Now I'm aware of how to unpack and how to pack the initrd with cpio and have even written a hook for /etc/initramfs-tools/hooks in the past to integrate a third-party kernel module. However, while the available script libraries seem to be geared towards the integration of modules, none of them seems to be for integration of other entities (in particular programs and their dependencies). What options do I have to automate the integration of some useful tools for recovery into the initrd? I'm talking about the "rescue" system that the system drops into if it is unable to mount the root drive given to it by the boot loader. Please note that I don't want the SquashFS approach as is used for Live-CDs because for the issue at hand it will be by far sufficient to include some relatively small tools that aid in recovery of the system (when it gets stuck in initrd and can't boot further). Also, the machines when they run into the issue that we have had in the past tend to boot into the rescue system, but there a few tools are missing to kick the system back on trail ...

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• Can not resolve hostnames on Xubuntu computers

  - by P Curtis

  I have a network of computers which has been running for many years. I have changed two of those to Xubuntu 11.10 and found I can no longer connect by ssh using the host-name from any other machine. I can connect and ping by IP although ping is very slow in one case (~200ms). All other machines are fine including another with Ubuntu 11.10. Host-name resolution works from Xubuntu machines to other networked machines. I am using wins resolution and have checked settings in /etc/nsswitch.conf are the same as my working Ubuntu systems. What is different in Xubuntu networking that I might have missed?

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• How to create repeatable table with unique ID's using jQuery

  - by milbert

  I need to create a table structure that can be "copied" and populated with a new set of data. However, each table must have unique IDs for functions that must access them later. For example: <table class="main"> <thead><tr><th class="header"></th></tr></thead> <tbody> <tr class="row"><td class="col0"></td><td class="col1"></td></tr> </tbody> </table> My current thought is to use jQuery to load the table from a seperate html file into a variable. Using this saved table I could then create a function that copies it, traverses the table to add an ID to each section where information will need to be appended from a seperate data source, and return this new table. I am new to jQuery and feel like I may be missing an easier/better way to accomplish this. Any help on this subject would be appreciated.

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• How to automatically generate html table from image in Linux?

  - by alfish

  In Photoshop, you can easily devide the image into zones using point and click and it automatically generates the corresponding html with image slices addressed in tables. Gimp also has a Slice (Filter Web Slice) but it is so rudimentary and, as far as I can see, does not allow point and click selection of slices. I am wondering if the functionality can be added into Gimp, or there are other Linux software to do this. I hate to return to Windows jut to do this simple task which I happen to use frequently. Thanks in advance for your suggestions.

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• Usual Suspects: Typical 3rd Party Entities in E-Commerce [closed]

  - by zharvey

  I am doing some requirements/analysis for a web app that I'd like to build (Ruby/Java developer here). This web app would have a store front, shopping cart and would need to be totally compliant with all e-com best practices. It's amazing how much non-technical info comes up when you search for phrases like "how does e-commerce work", but very little comes up in the way of technical details. As such, I'm having extreme frustration finding answers to what I consider pretty straight-forward questions. I came here because I believe this question is not off-topic; if it is, please leave a comment as to why this question does not belong here and I will happily remove it myself (upvotes if your comment can point me to the correct place for this question!). So then: What 3rd parties will I need to work with to have a modern, web-compliant e-com site? So far I can account for a payment gateway provider like Authorize.net and an SSL certificate provider like Trustwave. Any others? What other standards besides PCI compliance will I be held to (besides governing laws, of course!)? Vulnerability scans: PCI compliance requires quarterly scans: if I'm a "Level 4" (low volume) Merchant does that still apply to me? Irregardless, my backend architecture is quite huge, with web servers, app servers, database, message brokers and more. Do each of these servers need to be scanned?!? If not what servers do need to get these quarterly scans? I usually hate to ask micro-questions inside of one large one, but these are so closely-related I just felt like asking them all separately would be spamming the site with too many petty questions. Thanks in advance!

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