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• useradd instead of adduser,

  - by Chris at Well

  So I installed Ubuntu 13.04, set up sftp, that's all good. Setting up vsftpd for regular FTP users (we need those too, sadly. sftp isn't for good for all our purposes), i accidently used useradd to create one of the users instead of adduser. This user can't log in to frig all. I tried to delete the user and re-add it with adduser, no dice. It creates the user, but the permissions are frigged up. Any idea how I can completely undo a useradd, so that I can adduser this person and have everything coming up Milhouse again? Sorry boys, I frigged up hard.

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• Other people's files showing up in rhythmbox

  - by Avery Boyer

  I have my computer connected to a college network, and right now files that belong to other individuals on campus are showing up under Shared in rhythmbox. This is driving me up the wall, I absolutely despise the idea that files are being thrown around on the network and that other people's s*** is showing up on my computer, and that they may be able to see my files as well. This is a very, very serious problem as far as I am concerned and I want to know how I can ensure that I am sharing nothing with the network in the way of files on my computer and that no one else's files are showing up on my computer.

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• What significant lost advances on side tracks should be revived in the main stream of software?

  - by C.W.Holeman II

  In reading Alan Kay's question on Significant new inventions I was coming up with answers that were not new ideas but old ones that have been passed by in the main stream. So, what significant lost advances that happened on a side track should be revived in the main stream of software? These would be ideas that worked well in their context but a different context appeared and became dominant the context, even though it lacked the idea. It maybe that in the new dominant context one just cannot do something or it requires great effort to be exerted.

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• Change screen resolution from terminal

  - by Keith

  When I enabled my Nvidia graphics card, it changed the resolution of my screen to larger than my screen. As the result I cannot access any functions that were previously on the right side of my screen. How do I undo this? I originally had 8.04 and was able to change the resolution to whatever I wanted. I'm a new user and can copy and paste commands from a post to terminal mode but that's about it. I have no idea what they are or what they mean.

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• Redirect from the main page on multilanguage site

  - by Pluto

  I've decided to start developing multilingual web site. Now I'm thinking about the structure. The idea is to use a simple algorithm to find out what language is most interesting to the visitor when he makes his first visit to the root page, and then forward him to the corresponding address, for example, http://example.com/en/ for English-speaking audience and http://example.com/ru/ for Russians. The question is, how search engines react on such redirect? If this approach does not take away site's reputation, which redirects should I choose: 301 or 302? I would be very grateful for the reasoned response.

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• using heightmap to simulate 3d in an isometric 2d game

  - by VaTTeRGeR

  I saw a video of an 2.5d engine that used heightmaps to do zbuffering. Is this hard to do? I have more or less no idea of Opengl(lwjgl) and that stuff. I could imagine, that you compare each pixel and its depthmap to the depthmap of the already drawn background to determine if it gets drawn or not. Are there any tutorials on how to do this, is this a common problem? It would already be awesome if somebody knows the names of the Opengl commands so that i can go through some general tutorials on that. greets! Great 2.5d engine with the needed effect, pls go to the last 30 seconds Edit, just realised, that my question wasn't quite clear expressed: How can i tell Opengl to compare the existing depthbuffer with an grayscale texure, to determine if a pixel should get drawn or not?

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• Can these game be fully coded in html5/javascript?

  - by RufioLJ

  I mean the mechanics of the game. Would it be possible? -Pokemon GBA series, rendering the world would be easy, but what about battle mechanics? -MapleStory, after seen dragonbound.net which is an identical copy of Gunbound I would think it's rather possible, but I'm still not sure if javascript can handle all the mechanics of the world. It would be heavy on resources I guess? I'm asking this because I'm really interested in html5 game develop(I really think in a future will destroy flash on game dev ground). I want to have an idea of how far games developed with the html5/javascript technology can go. I got especially inspired by dragonbound. I really think it pushes htmlt/javascript to the limits (game dev).

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• Autostart desktop applications without session login

  - by derekcentrico

  I understand the idea of startup applications when starting a session (ie How do I start a program automatically when I boot?). However, I'm trying to have desktop applications for multiple users start when the computer reboots/starts. Some apps I'm aiming for are Google Music Manager, remote desktop server for each session, etc. How can I either have multiple user sessions launch on boot to get these apps going -or- have them launch some other way for those users? Right now I have my primary user automatically login to start its session and related apps...

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• 3D architecture app for Android or iPhone

  - by Manixate

  I want to make an app for 3D modeling on iPhone/Android. I cannot get the basic idea of how to get started. I have various options such as learning OpenGL ES, UDK or Unity3d but I want to create models(e.g architecture etc) in my app and then render them when user is finished modeling. I do not know if I am able to design models and then render them in the same app with various effects on the iPhone/Android using UDK or Unity3d. (Note: If you find this question unclear please ask, I may have skipped some vital information).

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• Sound card stop responding

  - by Merianos Nikos

  A few days ago I installed the latest version of Ubuntu in a computer of mine, that it has installed the "Sound Blaster Audigy 2ZS". After the installation and up to yesterday everything was excelent. Yesterday I installed the latest Ubuntu updates and today I had several issues. First the mouse was not responed as should be, but after restarted my computer everything was fine with mouse. Next was my sound card. For now I do not have sound at all :( I don't really know what's wrong. Does anybody has any idea on how to solve that issue, or from where to start, to find a solution ? If there is no any available solution for that issue, can I remove the latest updates that installed yesterday ? Kind regards Merianos Nikos

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• How to set up offline manifest for a web app to run in Safari in iOS?

  - by ahmd1

  I'm currently trying to set up an offline.manifest file for my web app to be used offline on an iOS device. For testing purposes I have a very simple HTML page that I'm trying to add to a home screen. I'm testing it on a live iPhone 4, but after the page is added to the home screen and I put the iPhone in the airplane mode and try to start my web app I get this error: "Turn Off Airplane Mode or Use Wi-Fi to Access Data" and then if I click OK I get: "Cannot Open Web App Name" "Web App Name could not be opened because it is not connected to the Internet" The following is added to the HTML file: <!DOCTYPE html> <html lang="en" manifest="scrts/offline.manifest"> and the offline.manifest is composed as such: CACHE MANIFEST ../pics/bkgnd_iphn_settings.png ../pics/mbl_btn_fb.png ../pics/mbl_btn_twt.png ../pics/icon_57_57_bg.png ../pics/icon_72_72_bg.png ../pics/icon_114_114_bg.png ../pics/icon_144_144_bg.png ../pics/splash_320_460_bg.png ../pics/splash_768_1004_bg.png ../pics/splash_1004_768_bg.png I got all instructions on composing it from here I also adjusted the .htaccess file to add this line: AddType text/cache-manifest .manifest Any idea what am I not doing right?

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• Repairing back-facing triangles without user input

  - by LTR

  My 3D application works with user-imported 3D models. Frequently, those models have a few vertices facing into the wrong direction. (For example, there is a 3D roof and a few triangles of that roof are facing inside the building). I want to repair those automatically. We can make several assumptions about these 3D models: they are completely closed without holes, and the camera is always on the outside. My idea: Shoot 500 rays from every triangle outwards into all directions. From the back side of the triangle, all rays will hit another part of the model. From the front side, at least one ray will hit nothing. Is there a better algorithm? Are there any papers about something like this?

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• C# XNA Make rendered screen a texture2d

  - by redcodefinal

  I am working on a cool little city generator which makes cities in the isometric perspective. However, a problem arose where if the grid size was over a certain limit it would have awful lag. I found the main problem to be in the draw method. So I took the precautionary step of rendering only items that were onscreen. This fixed the lag but, not by much. The idea I have is to render the frame once and take a snapshot. Then, display that as a texture2d on screen. This way I don't have to render 1,000,000 objects every frame since they don't change anyways. TL;DR - I want to Take a snapshot of an already rendered frame Turn it into a Texture2D Render that to the screen instead of all the objects. Any help appreciated.

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• SSL Certificate

  - by outdoorcat

  I've received the email below from google about my wordpress site and have no idea how to follow the instructions. Any help out there? Dear Webmaster, The host name of your site, https://www.example.com/, does not match any of the "Subject Names" in your SSL certificate, which were: *.wordpress.com wordpress.com This will cause many web browsers to block users from accessing your site, or to display a security warning message when your site is accessed. To correct this problem, please get a new SSL certificate from a Certificate Authority (CA) with a "Subject Name" or "Subject Alternative DNS Names" that matches your host name. Thanks, The Google Web-Crawling Team

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• How would I pursue a track in front-end web development?

  - by Koviko

  I've recently been put on heavy JavaScript projects and have become fond of the front-end world in comparison to the back-end. I have always been good at proper markup and CSS, and coupled with AJAX, pretty animations, and dynamically generated content, it's become a much more interesting and flashy world for me. I would like to be able to continue to hone my craft in the same way that I was able to become proficient at back-end development with PHP: getting paid to do it. How would I market myself as a front-end web developer with a strong interest in dynamic JavaScript-driven websites? Due to my strong background in back-end development, how would I find the companies that wouldn't waste my front-end skill set on simple HTML/CSS development? And as a bonus, how would I apply this to being a contractor/freelance developer rather than a salaried employee? While I like the idea of being able to remain a part of my creations, I also dislike the maintenance phase of projects.

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• C++: Checking if an object faces a point (within a certain range)

  - by bojoradarial

  I have been working on a shooter game in C++, and am trying to add a feature whereby missiles shot must be within 90 degrees (PI/2 radians) of the direction the ship is facing. The missiles will be shot towards the mouse. My idea is that the ship's angle of rotation is compared with the angle between the ship and the mouse (std::atan2(mouseY - shipY, mouseX - shipX)), and if the difference is less than PI/4 (45 degrees) then the missile can be fired. However, I can't seem to get this to work. The ship's angle of rotation is increased and decreased with the A and D keys, so it is possible that it isn't between 0 and 2*PI, hence the use of fmod() below. Code: float userRotation = std::fmod(user->Angle(), 6.28318f); if (std::abs(userRotation - missileAngle) > 0.78f) return; Any help would be appreciated. Thanks!

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• Where have the Direct3D 11 tutorials on MSDN have gone?

  - by Cam Jackson

  I've had this tutorial bookmarked for ages. I've just decided to give DX11 a real go, so I've gone through that tutorial, but I can't find where the next one in the series is! There are no links from that page to either the next in the series, or back up to the table of contents that lists all of the tutorials. These are just companion tutorials to the samples that come with the SDK, but I find them very helpful. Searching MSDN from google and the MSDN Bing search box has turned up nothing, it's like they've removed all links to these tutorials, but the pages are still there if you have the URLs. Unfortunately, MSDN URLs are akin to youtube URLs, so I can't just guess the URL of the next tutorial. Anyone have any idea what happened to these tutorials, or how I can find the others?

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• Corsair Hydro i series cpu cooler fan control

  - by user214690

  Im relatively new at Ubuntu and have found an answer to basically every single issue ive ever had thru this site... Otherthan this. I have been toying with the idea of a Corsair h80i for my dual boot system (win7/U12.10) and mostly use it in ubuntu. I have done some research on the interweb regarding fan control in linux and nearly ran up short untill I came across this thread: http://ubuntuforums.org/archive/index.php/t-2096166.html And it seems to have worked around it. (altho I have not tested it for myself) Is there any program/library/source that can be used to control the fans without having to MacGuyver it??

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• How to restruct RAID 10?

  - by user276851

  We would like to alter the partition without losing data. Here is the sketch of the plan. I am wondering if it is doable using mdadm; and if so, please kindly point some reference on how to carry out the following steps. For RAID 10, there are four disks used. (1 2)(3 4) The idea is to work on 1 and 3 while keeping 2 and 4 as backup. 1: break RAID 10 into two arrays of RAID 0 => (1 3) (2 4) (how to?) 2: re-partition and format (1 3) 3: copy data from (2 4) to (1 3) 4: re-partition and format (2 4) exactly as (1 3) 5: join (2 4) with (1 3) to form RAID 10 (how to?) Does it sound doable? Thanks a lot! Add: It looks like this guy (drumfile) is doing something similar, but lack of enough detail.

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• "A good programmer can be as 10+ times more productive as a mediocre one"

  - by m3th0dman

  I had read an interview with a great programmer (it is not in English) and in it he said that "a great programmer can be as 100 times as good as a mediocre one" giving reason for why good programmers are very well paid and why programming companies give many facilities for their employees. The idea was that there is a very large demand for good programmers, because of the above reason and that's why companies pay very much to bring them. Do you agree with this statement? Do you know any objective facts that could support it? Edit: The question has nothing to do with experience; if you talk about one great programmer with 1 year experience then s/he should be 10 times more productive than a mediocre programmer with 1 year experience. I agree that from certain experience years onwards, things start to dissipate but that's not the purpose of the question.

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• How do I get the Touchpad Settings working on a Dell XPS 13" Ultrabook?

  - by Dennis Wisnia

  Today I got an brand new Dell XPS 13 and I really like it. Wifi/Bluetooth/Brightness works very well. But only the Touchpad makes me insane. Okay, Multitouch is really nice and i love it on my Macbook but... i must click to click. How can I set up that is an "touch" to click? Its makes me insane. click, click, click.. Can I configure it? Update: I checked the proc/devices and got: I: Bus=0011 Vendor=0002 Product=0005 Version=0000 N: Name="ImPS/2 Generic Wheel Mouse" P: Phys=isa0060/serio1/input0 S: Sysfs=/devices/platform/i8042/serio1/input/input11 U: Uniq= H: Handlers=mouse0 event11 B: PROP=0 B: EV=7 B: KEY=70000 0 0 0 0 B: REL=103 Its really bad - and anyone have an Idea that Ubuntu thinks that is an Touchpad??

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• Reflective practice in programming using keystroke playback

  - by Graham

  I'm thinking of applying Reflective Practice to improving my programming skills. To that end, I want to be able to watch myself writing code. In general, what is a good method for applying Reflective Practice to the craft of programming? In particular, if it's a good idea, is there an editor that records keystrokes then plays them back at a later time - possibly running the keys together without delays, or replaying at a 2x/4x/8x accelerated rate? Screencasting with RecordMyDesktop is an option, but has downsides of waiting for encoding and ending up with a big video file instead of a list of keystrokes.

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• How to keep a team well-trained?

  - by PierrOz

  Hi dear fellows, I'm currently mentoring a small team of 4 junior dev in small software company. They are very smart and often achieve their tasks with a high-quality job but I'm sure they still can do better - actually I have exactly the same feeling for myself :) -. Besides some of them are more "junior" than other. So I would like to find of a funny way to improve their CS skills (design, coding, testing, algorithmic...) in addition to the experience they acquire in their daily work. For instance, I was thinking of setting up weekly sessions, not longer than 2 hours, where we could get together to work on challenging CS exercises. A bit like a coding dojo. I'm sure the team would enjoy that but is it really a good idea? Would it be efficient in a professional context? They already spend all their week to code so how should I organize that in order for them to get some benefits? Any feedback welcome !

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• Allow any arguments for a given command with sudo

  - by Mark L

  I have the following sudo config entry which I added via sudo visudo: mark ALL = NOPASSWD: /usr/bin/lxc-ls* I can run lxc-ls with my user fine but I can't append any parameters without it demanding I prefix the command with sudo. $ whoami mark $ lxc-ls test-container $ lxc-ls --fancy lxc-ls: error: You must be root to access advanced container properties. Try running: sudo /usr/bin/lxc-ls Any idea how I can edit via sudo visudo to allow for any argument after the command? I don't want to prefix the command with sudo as I'm using a python library to execute the command and it's being funny about sudo prefixes.

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• Useful versioning scheme for a git project?

  - by Oliver Weiler

  I have a small github project, which I need to add an option to to output some version number on the commandline. The problem is I have no idea how to "compute" the version number. Is this some random process? Should I just start at 1.0 (probably creating a tag or something), and put a number after . for fixes? I know this question is a bit vague... I just had never to deal with this, and want to use some sane versioning scheme. EDIT Im also interested into how to update this version number automatically, maybe using something like a git hook.

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