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• What does /dev/null mean in a shell script?

  - by rishiag

  I've started learning bash scripting by using this guide: http://www.tldp.org/LDP/abs/abs-guide.pdf However I got stuck at the first script: cd /var/log cat /dev/null > messages cat /dev/null > wtmp echo "Log files cleaned up." What do lines 2 and 3 do in Ubuntu (I understand cat)? Is it only for other Linux distributions? After running this script as root, the output I get is Log files cleaned up. But /var/log still contains all the files.

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• Android Dynamic 2D Map

  - by Deltharis

  My problem is, I want to create a 2D tiled map. Yes, I know it's been asked a lot. I've seen answers that propose the use of tiled however it only allows (or so it seems to me) to generate static maps that do not change once generated. And I need a large empty uniform space of empty tiles, upon which players may place various buildings (some spanning more than one tile and logically being the same one). How to approach this in Android? Do I make some kind of TableLayout, use arbitrarly large amount of rows and imageviews (with my emptyTile), than somehow work event-based changing of image ids from there? I'd think that only a portion of that map should be visible at a time, but I don't see how scrolling around could be the part of that structure.

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• Packaging an application written in C

  - by Jishnu

  I have an application written in C. What I have is a bunch of c files and some .h files. Also, I created a Makefile to do compilation. How can I compile this into a deb package. I searched google, and put everything into a "name_0.1.orig.tar.gz" file and created a folder named "name-0.1", then inside that folder, "dh_make" Skipping creating ../name_0.1.orig.tar.gz because it already exists Currently there is no top level Makefile. This may require additional tuning. Done. Please edit the files in the debian/ subdirectory now. You should also check that the name Makefiles install into $DESTDIR and not in / . I have a Makefile in name.tar.gz, why it is not recognizing ?

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• Is it possible to lose some directories when upgrading from 11.10 to 12.04?

  - by maythux

  Last day I upgraded my Ubuntu 11.10 desktop to Ubuntu 12.04. I was running a KVM virtual about 7 machines and managed by virt-manage software. Anyway when I finished upgrading I found that virt-manager is not working. So I had to reconfigure it again and install some other missing packages that was deleted! Eventually, I managed to solve this issue. Then I started to restore my virtual machines. I restored 2 machines without any problems. The third and fourth ones (Windows) made a check disk that lasted more that 6 hours but finally it worked. Other machines I can't find their attached hard disks. I don't know what happened but I can't find those files. Does upgrading delete files? Is there anyway to restore those files?

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• Multiple style sheets best practice

  - by user1145927

  I currently am working on a project which has one large style sheet for about 20 pages. The style sheet contains some styles which are specific for certain pages. I'd like to break the style sheet up so there is one style sheet for each page with one master style sheet that handles everything generic. The reason I want to do this is so people can work on multiple pages without having to worry about who has that large style sheet checked out (I'm using TFS). Is this good practice?

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• Alternating links and slide down content on a list of sub sections

  - by user27291

  I have a page for a doctor's practice. In the summary page for the practice there is a list of subsections such as Women's, Men's, Children, Sport, etc. Some of these sub sections are very large, others can be a paragraph or more with a short unordered list. In terms of content volume, the large subsections warrant their own separate page, the smaller one's not so much. I created a little plugin which enables me to use the list of subsections in 2 ways. When clicking on the title of a larger section, you'll be sent through to it's own page. For the smaller sections, a slide down box will open with the information. Is this a good way to handle my information architecture? Should I be giving the smaller sub sections their own page for SEO purposes?

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• My data vanished after copying to E drive

  - by pnp

  Of late I had been thinking of having a fresh install of Ubuntu. So I cut-pasted all my required files and folders in my E drive. Then I decided to not to have a fresh install and just let it be. Later, when I booted up in Windows (dual-boot with 12.04 and Windows 7), I found that the files and folders I had cut-pasted from my home account in Ubuntu are just not there. What is even more surprising is that now, when I am back on Ubuntu, those files and folders that should have been there in my E drive are also not there. Is it an Ubuntu issue or a hard drive issue?

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• At what point asynchronous reading of disk I/O is more efficient than synchronous?

  - by blesh

  Assuming there is some bit of code that reads files for multiple consumers, and the files are of any arbitrary size: At what size does it become more efficient to read the file asynchronously? Or to put it another way, how small must a file be for it to be faster just to read it synchronously? I've noticed (and perhaps I'm incorrect) that when reading very small files, it takes longer to read them asynchronously than synchronously (in particular with .NET). I'm assuming this has to do with set up time for things like I/O Completion Ports, threads, etc. Is there any rule of thumb to help out here? Or is it dependent on the system and the environment?

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• How do I stop banshee remembering what's been played?

  - by dunderhead

  How can I prevent Banshee from remembering what files I have played? I really hate the way it keeps surprising me by automatically playing, after the current track, the previous file it had played. I really HATE that. I was just listening to a beautiful piece of music and in a nice mood when Banshee, without asking me, immediately afterwards, started playing a really annoying answerphone message from earlier. My solution so far is to manually delete all files in the playlist, but obviously that's not a long term solution. I cannot find an option anywhere that says "Do not remember my history" (Did I mention I hate the way Banshee plays my files without asking me?)

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• Can't copy file (I/O error) Ubuntu Server

  - by QxQ

  I'm running Ubuntu Server 12.04, and basically found out that a couple of files aren't behaving like they should. The file name is r.-1.-1.mca, and I've tried using this terminal command sudo cp r.-1.-1.mca ../ The hard drive is working/thinking for a while, then spits this back out: cp: reading `r.-1.-1.mca': Input/output error cp: failed to extend `../r.-1.-1.mca': Input/output error I have another file behaving like this. My guess is that these files are corrupt, so I tried running the server in recovery mode and it told me to check the file system. However, it didn't come up with any errors. Is there a way to repair these files so I can use them normally again?

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• How can I set view preferences to sorted by reverse date modified?

  - by Statwonk

  I'd like to permanently set Nautilus's view preferences to show files sorted in reverse by date modified (newest first). Similar questions have been asked before: How can I sort files in Nautilus by modified date? Can I view my files sorted by date? However, they don't address making the preference permanent. Nautilus's preferences allow you to set sort by date modified (oldest first), but not reverse date modified (newest first). Does anyone have suggestions on setting sorted by reverse date modified as default?

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• How would I migrate a front page form based site to an IIS7 server? [on hold]

  - by Nick Gilpin

  I have an large html website on a very old server and I'm attempting to move it to a brand new server running IIS7. I've tried moving the entire site to the WWW directory, but then all my forms return "The HTTP verb POST used to access path is not allowed". Additionally, all the solutions I've found online only work on a page by page basis. Is there a simpler/faster way to migrate a large website containing many forms to IIS7? Here is the specific error message: The HTTP verb POST used to access path '/FormServer/Mig/_vti_bin/shtml.dll/admissions/askseaaggie.htm' is not allowed.

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• Buy the server contents

  - by user103475

  How i can buy the contents of the server of archive.ubuntu.com (for lucid lynx)? In my country i have ultra slow connection. It will take years for downloading all these gigabytes. Because, canonical will stop supporting ubuntu 10.04, i want all the files now, before it's too late. i know that all files will be transfer to old.dir but i think some will be lost. And anyway i want the files. My question is: Can canonical provide (with payment) a disk with the contents of the server? Cheers

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• @Microsoft: please provide universal and professional concepts

  - by Marko Apfel

  Why such constructs are included in the csproj-Files? <CodeAnalysisRuleSetDirectories>;c:\Program Files (x86)\Microsoft Visual Studio 10.0\Team Tools\Static Analysis Tools\\Rule Sets</CodeAnalysisRuleSetDirectories> <CodeAnalysisRuleDirectories>;c:\Program Files (x86)\Microsoft Visual Studio 10.0\Team Tools\Static Analysis Tools\FxCop\\Rules</CodeAnalysisRuleDirectories> So it every projects needs some manual steps to clean the project file so the solution could be build on a continuous integration server. That annoying! And also in a Visual Studio mixed editions team that’s too specific for the ultimate edition. As good as Visual Studio in most cases is, sometimes it is really far away from professional coding fundamentals and best practices.

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• EMC Gives Data Domain New Replication Features

  Cascaded replication and 180-to-1 remote site fan-in features are aimed at large distributed enterprises.

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• Runescape - Ubuntu 12.04 - Jaggex cache folder

  - by user214179

  does anyone here know how to hide the jaggexcache folder, jagexappletviewer file and jagex_cl_runescape_LIVE file from the home folder? The problem is this, everytime you play runescape (in both windows or linux), it creates those files and folders. The problem is that on windows, you can hide them and everything is fine. On linux, if you add ( /.) to the folder or file to hide it, when you play runescape, those files and folders are again created, because they cannot be found. As far as I know, the game is Java based (needs java iced tea plug in and java 7), so is there any way of changing the directory where the game puts all those files? like home/documents instead of just /home thanks!

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• How to maintain a file's 'last modified' date ?

  - by Will.

  I'm copying files and folders over from one filesystem to another (both are ext3) via cp in the terminal. The 'date modified' on all of the files are being changed to the current time although I am not modifying the folder or the files. I'd like for them to keep their existing 'last modified date' which vary within the past 5 years. I am not interested in changing them to a specific date as described this previous question, but to maintain the existing 'last modified' date. I'm using 12.04.

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• How can you put all images from a game to 1 file?

  - by ThePlan

  I've just finished a basic RPG game written in C++ SFML, I've put a lot of effort into the game and I'd want to distribute it, however I've ran into a small issue. Problem is, I have well over 200 images and map files (they're .txt files which hold map codes) all in the same folder as the executable, when I look in the folder, it makes me want to cry a little bit seeing so many resources, I've never seen a game which shows you all the resources directly, instead I believe they pack the resources in a certain file. Well, that's what I'm trying to achieve: I'm hoping to pack all the images in 1 file (Maybe the .txt files as well) then being able to read from that file or easily add to it.

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• Content disappearing

  - by Koen_vdp

  several times now, I've had a document with very large parts of the content simply disappearing. I have Ubuntu (precise pangolin) a few days now. all of the years with windows, I never encountered this-very unpleasant-problem. Anyone knows a solution? Type document: docx; Which Ubuntu: Precise Pangolin LTS. &In the meantime, I'm discovering more & more documents like that with very large parts of the concent just... vanished :-(( A very 'dangereous' situation :-(

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• UIDocumentInteractionController in iOS for Whatsapp Integration

  - by Smitha

  I was looking for a way to share my application created files through Whatsapp. I found we can chat using custom URL scheme provided by whatsapp : https://www.whatsapp.com/faq/iphone/23559013. But, to share files of my app, read that I have to use DicumentIntercationController. So, is there any smaple available? Also, when I read about apple docs, it says, "Create an instance of the UIDocumentInteractionController class for each file you want to interact with" (https://developer.apple.com/library/ios/documentation/FileManagement/Conceptual/DocumentInteraction_TopicsForIOS/Articles/PreviewingandOpeningItems.html#//apple_ref/doc/uid/TP40010410-SW1). So is it necessary to create instance for each file? I just want to share the files as and when i receive it through my service to my app. Thanks for the help in advance.

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• Error Setting Java Environment Variables

  - by Cherie Riesberg

  Problem:  Not exactly SharePoint, but the issue is when setting the %JAVA_HOME% environment variable, Java installs to the Program Files directory by default.  The space in the path seems to stop the variable from being read.  You get an error. Solution:  Change Program Files to Progra~1, so the path now looks like this: C:\Progra~1\Java\jdk1.6.0_23\bin\; You can type %JAVA_HOME%\bin\javac to test.  Output should look like this: Usage: javac <options> <source files> where possible options include: ...

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• Why is FTP file transfer from Android Phone Slow?

  - by Frychiko

  To transfer files from my Android phone to Ubuntu, I use an app that creates a FTP server on the phone. Copying files to Ubuntu 12.04 (same with 12.10) I get up to 260 KB/s. Copying files to Windows 7 I get up to 1050 KB/s. I am currently on a fresh install of 12.10 with barely anything installed with the same results. I have tested with both a Galaxy S3 and HTC Desire HD with identical results. I have tested about 5 apps with the same results. Why is it slow on Ubuntu?

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• Is there an application which organizes my "Downloads" folder automatically?

  - by rearlight

  I'm looking for an application which puts all files from my Downloads folder into a new generated folder (called like the date) per button press or automatically is able to move files to its destinated directory automatically (p.e. *.png files should be put into /home/user/pictures/random/, *.avi to /videos/, ...) If you are familiar with the DayFolder application: I'm looking for an application like that but for any folder (not only the Desktop). In my case that's Downloads because this folder gets cluttered on my PC very fast. Thanks for your advice/help!

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• I have a new file type that I would like to handle in gnome how to get file properties?

  - by Mark

  I have a new file type that I would like to handle in gnome. Establishing a new mime type, a new thumbnailer and a new application to display the file type is done. But I need a new tab on the file properties page. This tab is analogous to the tabs for exif information for jpg files or for encoding information for video codecs, that says how long the video is. The files concerned are embroidery files and the file properties needed to be displayed are things like phisical dimentions of the design, how much thread will be used and how many colours. My belief is that with current gnome 3 this is not possible, am I right? Or should I take a wider view that in Ubuntu, anything is possible, just may be a bit difficult?

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• What's the best subversion client to use for a working copy on a network share that's being modified by other users without a subversion client?

  - by loupai

  That probably sounds confusing. Here's my situation: I have a software project I'd like to version control with Subversion. The project files are on a network share which is modified by several users. I'd like to version control the directory with caveat that many of the users are not going to be using a SVN client when they add, modify, move, and rename files. I'll be doing all the version control myself along with one or two other users. When I commit the changes with an SVN client I'd assume that all changes made to file, all deletions, renames, etc are intentional. So how do I detect these changes if as user made them without using a client like TortoiseSVN? Can anyone recommend a client that could determine possible renames, deletions, and moved files? Thanks!

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