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• What are some non-MS languages that can write xlsx (Excel 2007+) documents efficiently?

  - by Honus Wagner

  Unfortunately, Excel format is required for the project I am working on. I have no problems getting the data I need in objects and arrays, and currently PHPExcel is doing handling the document generation. It works, but it's slow and loopy. Was wondering if there is a more efficient server language to generate Excel documents (not CSVs). This is a pure Linux environment so I need to stay away from .NET. I am open to any programming language that does it cleanly and efficiently. Thanks.

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• No sound on fresh install of 13.10

  - by Totalnon

  I installed a new copy of 13.10 today and cannot get my audio to work. Speakers test good on other devices, enabled in the BIOS, worked this morning in a Windows environment. I ran all of the available updates through apt-get. aplay -l lists my card (which tells me Ubuntu recognizes the hardware, I have been looking around the web and trying various things to no avail. Pulse folder permissions seem fine, I've reinstalled ALSA, and the card shows both digital and analog in the system settings sound section. I have tried this guide: Sound Troubleshooting Guide As well as looked through these forums under the tags sound and 13.10 Anyone have any ideas that may help me?

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• Design pattern: static function call with input/output containers?

  - by Pavlo Dyban

  I work for a company in software research department. We use algorithms from our real software and wrap them so that we can use them for prototyping. Every time an algorithm interface changes, we need to adapt our wrappers respectively. Recently all algorithms have been refactored in such a manner that instead of accepting many different inputs and returning outputs via referenced parameters, they now accept one input data container and one output data container (the latter is passed by reference). Algorithm interface is limited to a static function call like that: class MyAlgorithm{ static bool calculate(MyAlgorithmInput input, MyAlgorithmOutput &output); } This is actually a very powerful design, though I have never seen it in a C++ programming environment before. Changes in the number of parameters and their data types are now encapsulated and they don't change the algorithm callback. In the latest algorithm which I have developed I used the same scheme. Now I want to know if this is a popular design pattern and what it is called.

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• What is the impact of a CMS on page load time versus a static site?

  - by PleaseStand

  I am creating a 20-page site that will go on shared hosting. Each page will be about 20 KB (including HTML, CSS, and images common to all pages). To avoid manually adding navigation elements to each page, I am considering using a CMS. However, I am concerned that on a busy server, using a CMS would make the site load more slowly. In a shared hosting environment where PHP is run as a CGI binary, how much does a CMS (WordPress, Drupal, etc.) generally affect page load time, compared to both "plain HTML" static sites and those using PHP as merely a templating language?

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• s expression representation for c

  - by wirrbel

  Experimenting with various lisps lately (clojure especially) i have wondered if there are any s expression based representations of (subsets) of c, so you could use lisp/closure to write macros and then convert the s-expression c tree to pure c. I am not asking for a to-c-compilers of lisp/scheme/clojure but more of using lisps to transform a c syntax tree. Little background to why i am asking this question: i find myself to really enjoy certain clojure macros like the threading macros -> doto etc. And i feel that they would be great in a non FP environment as well.

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• How should I set up UDK with Git and CruiseControl?

  - by Martin Sojka

  For a new project in UDK, I'd like to set up a Git repository for version control and a CruiseControl.NET-based continuous integration solution. The good news is that he first part seems easy enough and CruiseControl.NET can work off Git repositories. The bad news is that according to my searches, nobody has ever tried to do this. Ideally, I'm looking for a step-by-step guide on how to set up such a development environment assuming more than one development computer, one central repository for the "master" branch, and one machine for building and packaging the binaries via CruiseControl.NET. Related: Version control system for game development with UDK? Options for UDK and version control repositories? CruiseControl.NET and Git

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• Why does Unity in 2d mode employ scaling and the default othographic size the way it does?

  - by Neophyte

  I previously used SFML, XNA, Monogame, etc to create 2d games, where if I display a 100px sprite on the screen, it will take up 100px. If I use 128px tiles to create a background, the first tile will be at (0,0) while the second will be at (129,0). Unity on the other hand, has its own odd unit system, scaling on all transforms, pixel-to-units, othographic size, etc etc. So my question is two-fold, namely: Why does Unity have this system by default for 2d? Is it for mobile dev? Is there a big benefit I'm not seeing? How can I setup my environment, so that if I have a 128x128 sprite in Photoshop, it displays as a 128x128 sprite in Unity when I run my game? Note that I am targeting desktop exclusively.

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• messed up PATH and can't login

  - by Ben Glasser

  I was screwing around and trying to add some environment variables to my path. I must have made a type or something because once I logged out, I could not lob back in. I know I'm not on caps lock or anything and in fact if I type the wrong password I am informed of this. However, when I type the correct password the desktop starts to load and then loops back to the login prompt. There also no other users on the machine for me to log in as other than guest which does not have the right permissions for me to fix things. Any ideas on where to go from here?

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• Map, Set use cases in a general web app

  - by user2541902

  I am currently working on my own Java web app (to be shown in interview to get a Java job). So I've not worked on Java in professional environment, so no guidance. I have database, entity classes, JPA relationships. Use cases are like, user has albums, album has pics, user has locations, location has co-ordinates etc. I used List (ArrayList) everywhere. I can do anything with List and DB, get some entry, find etc. For example, I will keep the list of users in List, then use queries to get some entry (why would I keep them in Map with id/email as key?). I know very well the working and features, implementing classes of Map, Set. I can use them for solving some algorithm, processing some data etc. In interviews, I get asked have you worked with these, where have you used them etc. So, Please tell me cases where they should be used (DB or any popular real use case).

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• X crash at login for 1 user

  - by marxjohnson

  User switching wasn't working on my 12.04 LTS desktop (just dropped me to TTY8 with a blinking cursor) so I tried to manually start a second X session by logging in to TTY6 and running startx -- :1. This didn't work either, and my machine locked up. Now when I try to log in as the second user from LightDM, X instantly crashes and I'm thrown back to the login screen. Other accounts on the machine work fine, and it happens for every desktop environment. I've had a poke around in my home directory, but I can't see anything obvious to change/delete to get it working again. Can anyone advise please?

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• Not Quite Multiseat

  - by user2773520

  I am attempting to create a pair programming environment sort of set up like multiseat: https://help.ubuntu.com/community/MultiseatX[1] or https://help.ubuntu.com/community/MultiseatOneCard[2] (as the standard issue boxes only have one graphics card) The thing is, I only want one login session, just with 2 monitors, keyboards, and mice. As well as having 2 active applications (so 2 people can be typing independantly). They should ideally be able to mouse over and click & type in the other persons monitor, as well as move windows between the montors. Does anybody know of anything like this that will work? We are running Ubuntu 12.04.

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• 'tools.jar' is not in IDEA classpath

  - by Patrick

  I am a new user of Linux, it has been recommended to me by my friend. He told me to install software called IntelliJ Idea IDE. Well I have been following the tutorial. But now when I try to open "idea.sh", an error message pops-up: 'tools.jar' is not in IDEA classpath. Please ensure JAVA_HOME points to JDK rather than JRE. Please remember that I'm new to Ubuntu and I'm planning for a nice long stay once I get myself into it :) Also I do not know if I am running a correct Java6 JDK. When I do java -version, this is what I get: java version "1.6.0_23" OpenJDK Runtime Environment (IcedTea6 1.11pre) (6b23~pre10-0ubuntu5) OpenJDK 64-Bit Server VM (build 20.0-b11, mixed mode) Thank You for reading this and I hope I will get a nice response.

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• Windows Phone 7 Design Template

  Windows Phone 7 Design Template Expression Blend is a wonderful design environment for WP7 (Windows Phone 7) but for quickly visualizing a concept nothing beats Illustrator! I am excited about WP7 and decided that having a solid .ai template would prove invaluable. Some of the details of the WP7 UI Design and Interaction Guide are a bit fuzzy (literally) but I was able to generate some useful layout guides, character styles, and symbols. While the template does not cover every aspect of the guide I think it is a good launching point; if you find it useful and extend it please share your updates (I created the template in CS4, if you have problems in earlier versions let me know).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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• How can i add more wallpapers in 11.10?

  - by bjnobrega

  How do I increase the amount of wallpapers that appear on the menu for customizing the desktop with my backgrounds in 11.10? I added more images to the respective folder in /usr/share/background as root, but the list does not remain persistent. The images in 11:10 changes alone. So I want to add funds to enhance the environment. When I copy the images to the folder /usr/share/backgrounds the list is updated and increased. But only for the first time. Thereafter, the system ignores the other images, and the list of funds has become original as first. Any help?

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• Launch Rhythmbox using a Keyboard shorcut

  - by palerdot

  I use Rhythmbox all the time in my Ubuntu. Is it possible to have a custom shortcut like Ctrl+R in Ubuntu, which can launch the Rhythmbox window, even if it is playing in the background ? Since, the emphasis of Linux OS flavors is to use keyboards as much as possible instead of mouse, i thought this functionality might tremendously help me in my Ubuntu environment. The Keyboard shortcuts sections asks for a command; So, I'm not able to figure out how to give a custom keyboard shortcut to a program like Rhythmbox. I'm using 12.04 if that helps. Thanks.

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• WP: Oracle Multitenant on SuperCluster T5-8: Study of Database Consolidation Efficiency

  - by uwes

  Consolidation in the data center is the driving factor in reducing capital and operational expense in IT today. This is particularly relevant as customers invest more in cloud infrastructure and associated service delivery. Database consolidation is a strategic component in this effort. Oracle Database 12 c introduces Oracle Multitenant , a new database consolidation model in which multiple Pluggable Databases (PDBs) are consolidated within a Container Database (CDB). While keeping many of the isolation aspects of single databases, it allows PDBs to share the system global area (SGA) and background processes of a common CDB . The white paper recently published on OTN: Oracle Multitenant on SuperCluster T5-8: Study of Database Consolidation Efficiency analyzes and quantifies savings in compute resources, efficiencies in transaction processing, and consolidation density of Oracle Multitenant compared to consolidated single instance databases (SIDBs) running in a bare-metal environment.

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• How to start vnc server on-demand (not on boot)

  - by QRohlf

  I have a vps which has the basic xfce environment & tightvncserver installed. I would like to have tightvncserver automatically start whenever I initiate a connection to the port it runs on (in my case, 5901). I've seen posts about using inetd or xinetd to do this, but I've also seen lots of posts saying that (x)inetd is not included in Ubuntu for a reason, and that it's a bad idea to use it. Anyways, I'm looking for a way to auto-start tightvncserver whenever there's an incoming connection to port 5901, preferably with as few dependencies as possible

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• I'm tempted to include easter eggs in my code - will this get me fired?

  - by blueberryfields

  While working on a portion of the code for our application, I've noticed an opportunity to include one of my side projects as an easter egg. I can do this in a way which I am certain will in no way harm anyone, and I've met with a significant and representative sample of our client base - I'm certain that those who have the knowledge and skills required to find the egg, will also find it humorous. How likely is it that I will get fired for including an easter egg in our application? For more context, the application is aimed at enterprise clients, and, while the users of it tend to be technical, geeky and will enjoy the egg, those in charge of purchasing are on the sales/marketing side of things. I can't even begin to guess how they would react. Edit: Yes, I've asked my manager. As you might expect in a corporate environment, the answer was: "I cannot condone this. You're on your own"

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• What are options for 3rd Party Centralized Software Settings Management?

  - by Jeff Martin

  I am an architect in an enterprise looking to build a SaaS solution. Our products are distributed over many different deployable containers, Web Services, Web UI's, etc. I am looking for some open-source or 3rd party software solution to manage the settings of our application. These would be similar to the settings you might find in Word or Eclipse or Visual Studio. The settings would control various behaviors and features of the product. (Probably not settings like which database to connect to but more like, should I show line numbers on the page or not by default..). Ideally, we would be able to store values for different dimensions (by tenant, by user, by application environment... ) Because we have so many different deployables, I am looking for a centralized solution that can provide a web service that each of the deployables can get their individual settings from. Does anyone know of a centralized service providing this sort of features or give me some help in searching for an alternative to rolling our own?

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• How do I get from a highly manual process of development and deploy to continuous integration?

  - by Tonny Dourado

  We have a development process which is completely manual. No unit tests, interface tests are manual, and merging and integration are as well. How could we go from this state to implementing continuous integration with full (or at least close to full) automation of build and test? We have a pretty intense development cycle, and are not currently using agile, so switching to agile with CI in one move would be a very complicated and expensive investment. How can we take it slowly, and still moving constantly towards a CI environment?

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• What are the technial and programming requirements for writing a stealth keylogger?

  - by user970533

  I'm planning to write/code one such stealth keylogger that would bypass detection by a certain antivirus. (I don't want to name the vendor as I know how good Google queries are against StackExchange websites). I don't want to just download any keylogger from internet and try to encode it to evade detection. Writing code myself I would have the ability to make changes as I go; obscuration on both high-level and low-level language. I like control too. It seems naive but is it true that keyloggers are a thing of the past, probably because of how effective AV's have become in detecting such programs? I want some nice points on how can one easily write a robust, effective key logger preferably for a Windows environment?

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• Dynamically rewrite URLs upon the user's selection - is it possible?

  - by jitzo

  In my PHP based web application, there's a form that generates a URL according to the user's selection. The form has 7 different fields, each one of them affects the final URL, none of them is mandatory. The final URL can be: /field1/user_setting_of_field1/field3/user_setting_of_field3/field6/user_setting_of_field6/ or just: /field4/user_setting_of_field4 these URLs should be rewritten to- /results.php?field1=user_setting_of_field1&field3=user_setting_of_field3&field6=user_setting_of_field6 and: /results.php?field4=user_setting_of_field4 Is it possible to create a single rewrite rule that will cover these variations? I'd hate to create different rewrite rule for every possible scenario, it'll take forever... I'm currently developing the app on a Windows machine with IIS 7.5, but will eventually deploy it to an Apache server. Is it possible in both? I currently need to solve it for the IIS environment, and later on for Apache.

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• Reasons why crontab does not work

  - by Adam Matan

  Many a time and oft, crontab scripts are not executed as expected. There are numerous reasons for that, for example: wrong crontab notation, permissions, environment variables and many more. This community wiki aims to aggregate the top reasons for crontab scripts not being executed as expected. Write each reason in a separate answer. Please include one reason per answer - details about why it's not executed - and fix(es) for that one reason. Please write only cron-specific issues, e.g. commands that execute as expected from the shell but execute erroneously by cron.

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• JPOUG Tech Talk Next Week!

  - by roy.swonger

  Mike and I are really looking forward to our trip to Japan next week, not least because we will have the opportunity to visit the Japan Oracle User Group for a Tech Talk. You can find all of the details about this event here: JPOUG Tech Talk, Tuesday, 12-NOV-2013 The topic for our talk will be "Different ways to Upgrade, Migrate, and Consolidate with Oracle Database 12c."We will discuss changes and enhancements to database upgrade, how to move into a multitenant database environment, and new features that make database migration easier and faster than ever. Thank you to our friends at the JPOUG for making this event possible! 

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• Wordpress plugin installation error.

  - by Steve

  I'm trying to upload secure-wordpress.1.0.6, and I receive the following error: Warning: touch() [function.touch]: open_basedir restriction in effect. File(/abs_path/wordpress/tmp/secure-wordpress.tmp) is not within the allowed path(s): (/abs_path/:/abs_path/:/usr/local/lib/php:/tmp/php_upload) in /abs_path/public/www/wordpress/wp-admin/includes/file.php on line 199 Download failed. Could not create Temporary file. The /wp-content folder and all it's subfolders have 777 permission. I've added the following two lines to wp-config.php: putenv('TMPDIR='.ini_get('upload_tmp_dir') ); define('WP_TEMP_DIR', ABSPATH .'wp-content/uploads/'); What else should I try? I am using Wordpress 3.04 in a PHP 4.49 environment.

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