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• Setting Environment Variable for nginx and Rails consumption

  - by kolrie

  Apache's module mod_env offers a handy way of setting environment variables in configuration files, like: <VirtualHost *:80> ServerName xyz.com DocumentRoot /var/www/rails_app/public PassengerAppRoot /var/www/rails_app SetEnv MY_VARIABLE contents </VirtualHost> http://httpd.apache.org/docs/2.0/mod/mod_env.html#setenv However, in nginx I couldn't find anything that serves the same purpose. What's the alternative here? I thought of setting environment variables in .profile files (I am using Ubuntu 10.04), but that wouldn't have the same "per vHost" isolation I have with Apache, right? What are the alternatives here?

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• Centering of a div, but the normal CSS does not work

  - by Jean

  Hello, I want to center a div, but the general way is #selector{position:relative;margin:0px auto;} What exactly is wrong below #crp{top:40%; position:absolute; margin:auto;} The Div below is not nested but a standalone. The #crp is going to the extreme right. <div id="crp">...something goes here....</div> Thanks Jean

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• Can you boot/install/restore a MacBook Pro with a MacBook Air USB stick?

  - by zekel

  The new MacBook Airs don't have optical drives, so you can't install or restore the OS via DVD. They include a little USB stick for this purpose. I have a MacBook Pro and a MacBook Air. Does anyone know if it will work with my MacBook Pro? I'm thinking about removing my optical drive to put in another HD. The only sticky situation I might get into is if I need to do an install or restore on the road without an external DVD drive. (Good article on replacing optical drive with hard drive enclosure: remiel.info/post/1601242301/making-the-leap-to-ssd-on-a-macbook)

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• C: performance of assignments, binary operations, et cetera...

  - by Shinka

  I've heard many things about performance in C; casting is slow compared to normal assignments, functional call is slow, binary operation are much faster than normal operations, et cetera... I'm sure some of those things are specific to the architecture, and compiler optimization might make a huge difference, but I would like to see a chart to get a general idea what I should do and what I should avoid to write high-performance programs. Is there such a chart (or a website, a book, anything) ?

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• F# mutual recursion between modules

  - by rwallace

  For recursion in F#, existing documentation is clear about how to do it in the special case where it's just one function calling itself, or a group of physically adjacent functions calling each other. But in the general case where a group of functions in different modules need to call each other, how do you do it?

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• What other sites / resources do you use to help you with programming

  - by Anthony

  Stack overflow has become the first place i come to whenever i have dev problem. I also like to browse when i'm killing time. Just curious to know what other general sites or resource people use regularly.

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• What is the best ways to duplicate DVDs in bulk?

  - by Axxmasterr

  I have some instructional videos I am getting ready to release on DVD and I want to know what is the quickest and most cost effective way to produce these in bulk? I am open to both customized PC based software/hardware solutions as well as dedicated hardware appliances which perform the same function. All options considered seriously. I don't have a problem building a system for this purpose. If I build something I would prefer it have the ability to make multiple copies at once. I figure I will need to make about 300 copies initially.

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• dhcp code for pxe server

  - by avoq

  I'm trying to understand every single line of the following script but to no avail. I'd be glad if someone could help me. For sure I know its purpose is to start the DHCP server as well as the TFTP...But I'm stuck: killall dnsmasq 2>/dev/null dnsmasq --enable-tftp --tftp-root=$PXEDATA/boot --dhcp-boot=pxelinux.0,"$IP",$IP --dhcp-range=$(echo $IP | cut -d. -f1-3).50,$(echo $IP | cut -d. -f1-3).250, infinite --dhcp-option=option:router,192.168.0.254 --log-dhcp Why killall, why dnsmasq 2 What does "2" stand for? "--" what does it mean? Thanks a lot.

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• Where do dsrm, dsadd and dsmove come from?

  - by Ben

  I am writing a script to join a machine to the domain after it has been imaged. (Don't want to do it in Sysprep.) On the machine I am writing the script on (a battered, world weary IT workhorse with all sorts of crud on it) my script works fine. However on one of my shiny new test machines, it doesn't find dsrm and dsadd. I can only assume I have inadvertently installed this on my machine in the past. I want these to be used just for the purpose of joining the machines to the domain, so don't want any full blown admin-ware installed. Where do I get / turn on dsrm etc?

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• Moving windows using keyboard...faster?

  - by Alois Mahdal

  I like using keyboard shortcuts because it's faster as it does not force me to move my hands off the keyboard. In Windows I can use them to move windows around desktop: Press Alt+Space to open common windows menu Press M to choose "Move" command Navigate window position by cursor keys Confirm new position with Enter Additionally, to achieve better accuracy, I can hold Ctrl while navigating. Now the problem is that the normal "step" when moving is about 20px, and my desktop is quite large, so "walking" all the way across takes quite a long time. This kind of defeats the purpose of using keyboard for these tasks. Is it possible to change size of this step so that takes less steps to walk the same distance? (I imagine a hidden setting in Windows registry...?) I tried holding Alt while navigating, but it does not seem to have influence on speed.

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• How to check WCF generated client is compatible with service at runtime

  - by Schneider

  I realise that WCF and services in general are meant to be loosely coupled. But I have a requirement that my client app can check whether an given WCF endpoint contains a service that matches its generated client code. In other words I need to check for a compatible service. Obviously I could have a method that returns a manually maintained version number, but I would prefer not to have to write my own meta data system if WCF can do something out of the box.

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• wsFederationHttpBinding over net.tcp

  - by CodeChef

  I have services that use net.tcp bindings (both streaming and buffered endpoints.) I'd like to add WIF federated security to those services, while continuing to use net.tcp bindings. I've tried to create custom bindings, but so far have been unsuccessful. Below is the general architecture that I'm attempting. I'm looking for the correct binding configuration to make this work. Client - WPF Application Relying party - WCF Service with net.tcp endpoints STS - WCF Service with http(s) endpoint

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• Best options for image resizing

  - by Claudio Redi

  Hi, I have resize images exceeding a max size. Methods I tried so far are not good enough :-( System.Drawing.Image.GetThumbnailImage generates very poor quality images in general. Playing with options like this one I can generate better images in quality but heavier than the original one. Probably the second option (or something similar) is the best option and I would need to resize using the proper options. Any advice?

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• How do I rename a process on Linux?

  - by jemfinch

  I'm using Python, for what it's worth, but will accept answers in any applicable language. I've tried writing to /proc/$pid/cmdline, but that's a readonly file. I've tried assigning a new string to sys.argv[0], but that has no perceptible impact. Are there any other possibilities? My program is executing processes via os.system (equivalent to system(3)) so a general, *NIX-based solution using an additional spawning process would be fine.

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• One class per file rule in .NET?

  - by Joan Venge

  I follow this rule but some of my colleagues disagree with it and argue that if a class is smaller it can be left in the same file with other class(es). Another argument I hear all the time is "Even Microsoft don't do this, so why should we?" What's the general consensus on this? Are there cases where this should be avoided?

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• Extract photo stills from .vob files

  - by Eric Rath

  My parents had all the family slides scanned by a photo lab. The lab returned the digital photos on two DVDs as movies; there's some stock music over a slideshow with fades between each photo. The discs contain only a handful of files, including some very large VOB files. I'd like to extract these photos and import them into iPhoto. I saw this answer about capturing stills, and that might work if I can figure out the right offset from the beginning and the right capture rate. But this approach seems very error-prone for this purpose. Is there a better way? I wish the individual photo files were stored in a directory on the discs, but they're not there.

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• How to know what dll or services taskhost.exe is hosting?

  - by tigrou

  I have recently discover a new process in the task manager : taskhost.exe (maybe it was there before but i did not notice it) As the name implies, it seems to be used for running dll in background (like rundll32.exe). Is there a way to know which dll / services this process is hosting ? i would like to know for which purpose it is used and if there is some malware or not. I know it is possible to see which services svchost.exe process is hosting using process explorer utility. I have checked taskhost.exe threads and their stacks using process explorer, here is what i get : So it seems it is used for sound (winmm + playsndsrv). But there is also other things for which very few information is provided (ex : thread 1456, taskhost.exe as start address and nothing relevant can be found in stack (same for 1464, 2272 and so). So maybe it is not the right way to do.

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• Where did the code that made it so you have to "fan" facebook pages to see content come from?

  - by Kyle

  Hey there. I have noticed a general trend in pages on facebook with a tab that requires users to "fan" a page to see it. I know these people aren't bright, but was wondering where exactly did this code (not tactic - for the sake of not having this question deleted) originate? I would really love to know. Thanks.

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• video editing tool to color overlay a specific part

  - by Santosh

  I have downloaded a video from YouTube. But the uploader has put some link (their twitter and facebook) for promotional purpose. The links keeps coming up through out the video in the black area (up and down of the video which are black). Thank god that links are on the black part of the video otherwise it would be hard to remove.    Also I want to remove the the last few seconds of the video. I don't want to crop that part. The video is in MP4 format. I don't want to lose the quality in anyway, I won't mind if the file size increases. I want a opensource and free tool. Good if it is available to both Windows and Ubuntu. Here is a link to the video.

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• Getting started with VNC

  - by Stephen

  I have subscribed to a VPS service for the purpose of running some remote applications. To do this I'm going to need a remote desktop of one sort or another. With this in mind it was suggested that I try Ubuntu. The installation that was prepared for me was Ubuntu 11.10 64 bit (Ubuntu 11.10 (GNU/Linux 2.6.18-348.4.1.el5.028stab107.1 x86_64)) From here I used apt-get install ubuntu-desktop which completed successfully. I rebooted the machine and reconnected via ssh. When I attempt to connect from TightVNC on my Windows machine I get a message about the session being actively refused. What should I do to confirm the service is running? Do I need to setup a firewall rule to allow the ports to pass through? (I am a linux newb so explicitness is appreciated)

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• Algorithm for neatly printing a paragraph on a printer

  - by davit-datuashvili

  First of all, this is not homework, so please don't tag it as homewrok I did not understand this problem. Can anybody explain it to me? It is not the english that I do not understand, but rather the general gist of the problem.

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• Copy only remaining rows after filter to new Excel Workbook

  - by Joel Coehoorn

  I have an Excel file with an external data connection set up. It pulls data in directly from a database, and gives us about 450 rows. The header row allows us to filter the data in the sheet, and we use this as a general purpose tool... I will use the filters to narrow down what I'm looking at based on criteria that change depending on the circumstance. Often, after filtering the data, I want to send just the filtered records to another person. I'd like to copy/paste just the remaining rows into a new Workbook to send via e-mail. Unfortunately, this doesn't work. When I paste the data, it still pastes all the data. The filtered rows are still in the workbook... they're just hidden. I want them gone from the new file completely. How can I do this?

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• What is the best way to create a debugging web page for a computation in Java?

  - by Shooshpanchick

  I'm developing a website that uses some complex computations (NLP-related). My customer wants to have "debugging" webpages for some of these computations where he can run them with arbitrary input and see all the intermediate results that occur during computation. Before this request all of the computations were encapsulated in beans and intermediate results were logged into general log. What is the best way to capture all these results on Java level to render them as webpage?

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• Good tool to convert sourcecode to PDF?

  - by Toad

  I've a daunting task of getting familiair and possibly re-architecting large pieces of old source code. I was hoping there would be a nice tool to convert php (in my case), but let's make it more general: any language to PDF, for offline browsing on a Kindle or Ipad Would be ideal if it would create indexes / hyperlinks automatically. So function calls can be easily browsed into

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• SNMP - So I have a MIB. Now What?

  - by senfo

  I can't seem to get my head wrapped around the purpose of a MIB. I have a collection of ~20 MIB files that were supplied to me by the vendor, but what do I do with them? I also have a few OID's that were supplied by the vendor that don't seem to be valid. When I issue an "snmpget -v1 -c public 192.168.0.123 .1.4.6.3.2.6.2" (assume that's a valid OID), I get an error indicating the variable is unknown. Does this sound like a hardware configuration problem? Do I need to "load" (for lack of better words) the MIB into the device? Unfortunately, the vendor has been completely unresponsive with returning emails to my questions, so any help would be greatly appreciated.

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