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• Nautilus only starts as root user

  - by user7978

  Hello. I am running Ubuntu 10.04 64-bit. When I attempt to start Nautilus from the command line, it does not appear -- although a PID is generated. As root/sudo, I can start Nautilus fine. One note: I run e16 as the windows manager, so I do not use Nautilus to draw my desktop. However, even under this configuration, Nautilus used to run fine as a "regular" user. The permissions for Nautilus are the same as the other packages in /usr/bin. I believe this is a Gnome issue, but I'm fumbling at this point.

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• Besides macros, are there any other metaprogramming techniques?

  - by mhr

  I'm making a programming language, and, having spent some time in Lisp/Scheme, I feel that my language should be malleable. Should I use macros, or is there something else I might/should use? Is malleable syntax even a good idea? Is it perhaps too powerful a concept? EDIT: In doing some research, I found fexprs. I don't really understand what these are. Help with that in an answer too please. EDIT2: Is it possible to have a language with macros/something-of-a-similar-nature without having s-expressions?

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• Azure Florida Association: New user group announcement

  - by Herve Roggero

  I am proud to announce the creation of a new virtual user group: the Azure Florida Association. The missiong of this group is to bring national and internaional speakers to the forefront of the Florida Azure community. Speakers include Microsoft employees, MVPs and senior developers that use the Azure platform extensively. How to learn about meetings and the group Go to http://www.linkedin.com/groups?gid=4177626 First Meeting Announcement Date: January 25 2012 @4PM ET Topic: Demystifying SQL Azure Description: What is SQL Azure, Value Proposition, Usage scenarios, Concepts and Architecture, What is there and what is not, Tips and Tricks Bio: Vikas is a versatile technical consultant whose knowledge and experience ranges from products to projects, from .net to IBM Mainframe Assembler.  He has lead and mentored people on different technical platforms, and has focused on new technologies from Microsoft for the past few years.  He is also takes keen interest in Methodologies, Quality and Processes.

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• How to setup passwordless SSH access for root user

  - by Cerin

  I need to configure a machine so software installation can be automated remotely via SSH. Following the wiki, I was able to setup SSH keys so my user can access the machine without a password, but I still need to manually enter my password when I use sudo, which obviously an automated process shouldn't have to do. Although my /etc/ssh/sshd_config has PermitRootLogin yes, I can't seem to be able to login as root, presumably because it's not a "real" account with a separate password. How do I configure SSH keys, so a process can remotely login as root on Ubuntu?

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• Suggestions for Future or On-The-Edge Languages (2011)

  - by Kurtis

  I'm just looking for some suggestions on newer languages and language implementations that are useful for string manipulation. It's now 2011 and a lot has changed over the years. Most of my work includes web development (which is mostly text-based) and command line scripting. I'm pretty language agnostic, although I've felt violated using PHP over the years. My only requirements are that the language be good at text manipulation, without a lot of 3rd party libraries (core libraries are okay, though), and that the language and/or standard implementation is very up to date or even "futuristic". For example, the two main languages I'm looking at right now are Python (Version 3.x) or Perl (Version 6.x). Research, Academic, and Experimental languages are okay with me. I don't mind functional languages although I'd like to have the option of programming in a procedural or even object oriented manner. Thanks!

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• My user can't upload files to folders owned by www-data

  - by Thomas Gautvedt

  I think I have screwed up my permissions in Ubuntu. I am using my server to run PHP. I recently ran across a problem where PHP could not create directories in the var/www-directory, so I searched around on the internet. Now PHP can write and access anything like it should, but as a user, I can't create new folders or files anymore. Right now, the permissions for folders are like this: drwxrwsr-x 2 www-data www-data [Folders] This is the permissions when I upload using sftp: -rw-rw-r-- 1 gautvedt www-data [Folders] What have I done wrong and how can I change this?

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• How to solve linear recurrences involving two functions?

  - by Aditya Bahuguna

  Actually I came across a question in Dynamic Programming where we need to find the number of ways to tile a 2 X N area with tiles of given dimensions.. Here is the problem statement Now after a bit of recurrence solving I came out with these. F(n) = F(n-1) + F(n-2) + 2G(n-1), and G(n) = G(n-1) + F(n-1) I know how to solve LR model where one function is there.For large N as is the case in the above problem we can do the matrix exponentiation and achieve O(k^3log(N)) time where k is the minimum number such that for all km F(n) does not depend on F(n-k). The method of solving linear recurrence with matrix exponentiation as it is given in that blog. Now for the LR involving two functions can anyone suggest an approach feasible enough for large N.

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• What tools should I consider if my aim is to make a game available to as many platforms as possible?

  - by Kensai

  We're planning on developing a 2D, grid-based puzzle game, and although it's still very early in the planning stages, we'd like to make our decisions well from the beginning. Our strategy will be to make the game available to as many platforms as possible, for example PCs (Windows, Mac and/or Linux), mobile phones (iPhone and/or Android based phones), game consoles (XBLA and/or PSN) PC will have an emphasis, but I believe that's the most flexible platform so that shouldn't be a problem. So, what programming language, game engine, frameworks and all around tools would be best suited for our goal? P.S.: I'm betting a set of tools won't cover ALL of them, and that there will still be some kind of "translating" effort for some platforms, but we'd like to know what the most far reaching are.

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• My talk at the Launch of the Vancouver Silverlight User Group

  Last week I did a presentation for the Launch of the new Vancouver Silverlight User Group (http://vanslug.net). I had a touch screen laptop so I started my presentation with the Multi Touch Silverlight Puzzle demo, wow effect guaranteed!   So 80 people were Rickrolled this night! You can download and try this demo from this link: http://www.silverlight.net/community/samples/silverlight-4/html-puzzle/   My presentation was mostly inspired by this awesome MIX10 session: Microsoft...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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• mod_rpaf problems with Nginx front, Apache back-end after Ubuntu upgrade

  - by Kenn

  I'm running an Nginx front-end for static files, and proxying to an Apache backend for PHP and Passenger, using Apache's mod_rpaf to set the correct remote IP address on the backend. Everything worked fine until I upgraded to Ubuntu 12.04 (Precise). Now Apache reports all connections coming from 127.0.0.1. Here's the relevant configuration. Nothing here changed with the upgrade. Nginx: proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; mod_rpaf: <IfModule mod_rpaf.c> RPAFenable On RPAFsethostname On RPAFproxy_ips 127.0.0.1 ::1 RPAFheader X-Forwarded-For </IfModule> I'm using %{X-Forwarded-For}i in my Apache LogFormat directive and the access logs are showing the correct remote address, so I know Nginx is passing the address along properly. In a phpinfo() test, HTTP_X_FORWARDED_FOR is showing the correct remote address, but REMOTE_ADDR is 127.0.0.1. This is reflected in PHP applications as well, such as WordPress comments. I've tried switching Nginx and mod_rpaf to X-Real-IP with no effect. Did something change that I missed? Relevant version info, everything installed from the Ubuntu repository: Nginx 1.1.19 Apache 2.2.22 mod_rpaf 0.6

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• Gnome question> Nautilus only starts as root user

  - by user7978

  Hello. I am running Ubuntu 10.04 62-bit. When I attempt to start Nautilus from the command line, it does not appear -- although a PID is generated. As root/sudo, I can start Nautilus fine. One note: I run e16 as the windows manager, so I do not use Nautilus to draw my desktop. However, even under this configuration, Nautilus used to run fine as a "regular" user. The permissions for Nautilus are the same as the other packages in /usr/bin. I believe this is a Gnome issue, but I'm fumbling at this point.

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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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• User Experience Tablet Guide Released on UX Direct Site

  - by Madhuri Kolhatkar

  Tablet Guide available on UX Direct NOW Responding to a popular demand from our customers, Oracle Application's user experience team is happy to externalize its new design guide for creating tablet based solutions for Enterprise applications on the UX Direct website. Download and use this guide to create great and successful customer experience for your users. UX Tablet Guide for Oracle Applications This guide provides basic help for designers, developers, and project managers trying to approach tablet design and testing from an enterprise point of view. If you are embarking on a tablet application design project, start here first. In the spirit of tablet design, it is delivered in the form of an iPad interactive iBook .Use this guide and tell us what you think. We would love to see examples of your creations. Watch this space for more updates and new and innovative design tools.

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• Design Pattern Books, Papers or Resources for Non-Object Orientated Paradigms?

  - by FinnNk

  After viewing this video on InfoQ about functional design patterns I was wondering what resources are out there on design patterns for non-object orientated paradigms. There are plenty out there for the OO world (GOF, etc, etc) and for architecture (EoEAA, etc, etc) but I'm not aware of what's out there for functional, logic, or other programming paradigms. Is there anything? A comment during the video suggests possibly not - does anyone know better? (By the way, by design patterns I don't mean language features or data structures but higher level approaches to designing an application - as discussed in the linked video)

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• Installing ubuntu, asks for user/pass

  - by NickGreen

  Hi there, Im trying to install ubuntu v10.10 64bit on my pc. Unfortunately when I try to boot the installation from my usb-drive the installation begins with asking for a username and password.. I didn't set up a user or a password for that matter, so what username/pass should I fill in. I already tried to submit the form blank and with root / root but without success.. Somebody knows what the right combination is or explain if I'm a complete idiot for not understanding what to do.. Thank you alL!

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• What significant progress have we made in Rapid Application Development?

  - by Frank Computer

  Since the introduction of OOPL's and event-driven programming, I feel like developing an application has become harder and more tedious, when it should have been the other way around! We should have development tools which can generate prototype apps which can be quickly and easily customized into sophisticated applications, even by novice users! We really need new ideas in this area of software development and I would like to know of any good ideas. If we can't really find them, then we should ask "Where did we miss the boat?.. Why?.. and What should we be doing?"

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• Ubuntu 12.04 LTS Desktop 64 bit user permissions or apache2 rewrite problem

  - by mtm

  have installed 12.04 Desktop 64 bit, manually installed LAMP, phpmyadmin, php5-dev,PEAR, PECL, apc, ssh, created user to own /var/www/ and transferred 3 sites to /www/. sites are in subfolders, sites - available all configured, and enabled. One site is pure html, two athers - php. Enabled curl, but phpmyadmin started at first, also php sites, than stopped working /show blank pages/ sites said Clean urls cannot be enabled. Html site still working. Where is the problem, and why the php sites stop working? In all apache .conf files Allow Override is set to ALL. php sites have .htaccess files. And this configuration worked with Ubuntu 10.04.

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• Find out if there is a local user logged in when logging in over ssh

  - by sebastiangeiger

  I need to run some calculations on a machine that I can only access remotely but also serves as a work station. There are many of them and I want to pick a "free" one. Free means in this case that no one is logged in locally. My first try was the who command, but for some reason it only lists "selected" users and I can't really find out how they are selected. Next try: ps aux | cut -d " " -f1 | sort | uniq: better showing a bunch of demons but also the local user that was not displayed by who. My current solution is to go in and do ps aux | grep "gnome-session" which is better but still gives me a lot of junk. Ideally I am looking for something that I can include in my ssh profile that warns me about (active) local users when I log in.

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• '/'var/www/' vs '/home/$USER/public_html'

  - by OrganizedFellow

  I recently started using Ubuntu as a LAMP server. I've come across plenty of tutorials that say to place the files at '/var/www/' and I've also seen others that put them in '/home/$USER/public_html/'. During my testing and figuring stuff out, I was successfully able to view a test site URL from each location. Is one better than the other? I thought that maybe it was just preference. But the more I think about it, the more I want to keep all my work in my Home folder.

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• Programatically loading user controls

  - by PhilSando

  Today's little problem is that I am trying to load user controls from my codebehind like so: Dim myControl As UserControl = Page.LoadControl("~\Modules\Content.ascx")              Controls.Add(myControl)  On running the page myControl is no where to be seen. I wonder why that is? Well after a bit of thought the following come to mind... Am I using the correct code to insert the usercontrol? Is there an alternative available? Does the fact that the usercontrol has a page_load method make a difference? Does the fact that the usercontrol is being called from the page_init method make a difference? Do I need to register the control in my aspx page at design time? I'll be looking to answer these questions as the day goes on!

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• How much configurability to give to users regarding concurrency?

  - by rwong

  This question is a narrowing-down of these related questions: How much effort should we spend to programming for multiple cores? Concurrency: How do you approach the design and debug the implementation? Given that each user's computers may have different performance characteristics with respect to calculations, memory, disk I/O bandwidth and network I/O bandwidth, and that it is difficult to implement an automated self-tuning system in your software, how much configurability should we give to the end-users so that they can find ways (by trial-and-error?) to improve our software's efficiency? If we give users the ability to change these settings, how do we give visual feedback to users so they can measure the performance changes?

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• Why is JavaScript not used for classical application development (compiled software)?

  - by Jose Faeti

  During my years of web development with JavaScript, I come to the conclusion that it's an incredible powerful language, and you can do amazing things with it. It offers a rich set of features, like: Dynamic typing First-class functions Nested functions Closures Functions as methods Functions as Object constructors Prototype-based Objects-based (almost everything is an object) Regex Array and Object literals It seems to me that almost everything can be achieved with this kind of language, you can also emulate OO programming, since it provides great freedom and many different coding styles. With more software-oriented custom functionalities (I/O, FileSystem, Input devices, etc.) I think it will be great to develop applications with. Though, as far as I know, it's only used in web development or in existing softwares as a scripting language only. Only recently, maybe thanks to the V8 Engine, it's been used more for other kind of tasks (see node.js for example). Why until now it's only be relegated only to web development? What is keeping it away from software development?

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• What is Perl's relation to hackers? [closed]

  - by K.Steff

  I know Perl is a language revered by many hackers (as in hacker vs cracker) and respected by many good programmers for its expressiveness. I also realize it is useful to know and it's very handy at generalizing common Unix tasks (Unix here includes Linux and Cygwin). I also know that being a good hacker probably means you're a good programmer in general (references on this one are sparse around the web, but about everything Paul Graham has ever written seems approving of this statement to me). So my question is whether there is a reason that attracts hackers to Perl in particular? Will learing Perl improve my general programming, problem-solving and hacking skills if done properly? Does it present unique tools that are more useful to a hacker?

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• What language has the best/most library bindings?

  - by Rook

  A library binding allows a programming language to use a library written in another language. Most commonly you want to access a C library like libcurl from a language like PHP or Python. Not all bindings are created equally, for instance the libcurl binding for Python was abandoned almost 3 years ago and their sf.net bug tracker is overrun with unsolved problems. PHP on the other hand has very good libcurl bindings that are actively maintained. So here is my question: What language has the best and/or the most bindings?

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• Checking whether the user input is a str in Python [migrated]

  - by Sahil Babbar

  I checked various questions on Stack Overflow but one thing every logic lacks. Let me demonstrate using Python: while True: user_input = raw_input() if type(user_input) == str: print 'ERROR' else: print 'BINGO' Also, we cannot use input() in place of raw_input() as it gives the error:Traceback (most recent call last): File ".\test.py", line 3, in <module> user_input = int(input()) File "<string>", line 1, in <module> NameError: name 'asdf' is not defined The problem here is that raw_input converts the user input into string so it always prints 'ERROR' and if I change the second line to user_input = int(raw_input) then, it gives an error: Traceback (most recent call last): File ".\test.py", line 3, in <module> user_input = int(raw_input()) ValueError: invalid literal for int() with base 10: 'asdf' I tried this with try and except but it shall work fine to check integer but not a string. I feel that this question may be marked as a duplicate but I think that this query is important, if logically taken.

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