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• How to make and restore incremental snapshots of hard disk

  - by brunopereira81

  I use Virtual Box a lot for distro / applications testing purposes. One of the features I simply love about it is virtual machines snapshots, its saves a state of a virtual machine and is able to restore it to its former glory if something you did went wrong without any problems and without consuming your all hard disk space. On my live systems I know how to create a 1:1 image of the file system but all the solutions I'v known will create a new image of the complete file system. Are there any programs / file systems that are capable of taking a snapshot of a current file system, save it on another location but instead of making a complete new image it creates incremental backups? To easy describe what I want, it should be as dd images of a file system, but instead of only a full backup it would also create incremental. I am not looking for clonezilla, etc. It should run within the system itself with no (or almost none) intervention from the user, but contain all the data of the file systems. I am also not looking for a duplicity backup your all system excluding some folders script + dd to save your mbr. I can do that myself, looking for extra finesse. I'm looking for something I can do before doing massive changes to a system and then if something when wrong or I burned my hard disk after spilling coffee on it I can just boot from a liveCD and restore a working snapshot to a hard disk. It does not need to be daily, it doesn't even need a schedule. Just run once in a while and let it its job and preferably RAW based not file copy based.

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• Computer won't start unless power is removed for ~5 minutes

  - by Paul Tarjan

  I have a fairly standard 2-year old desktop computer (quad-core intel, single hard drive, decent video card, 300W power supply) which recently started acting up. I'm not sure what the cause is, so hopefully you can help. Sometimes (once a week-ish) I press the power button and nothing happens. No blinking, no sounds, no nothing. If I remove the power cord (or flip the switch on the power supply) I hear a capacitor discharge. If I leave it in the "no power at all" state for about 5 minutes then I can put the plug back in and the computer works perfectly. What is the issue? What do you think I have to replace?

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• Multiple thunderbird Icons in System Tray(Windows 7) & TaskBar

  - by chobo2

  Is this some new "feature" for thunderbird 8? When I start thunderbird it starts by opening thunderbird. Once it is loading thunderbird it loads another 6 thunderbirds. The windows are called Mozilla Thunderbird Inbox - [email protected] - Mozilla Thuderbird Inbox - [email protected] - Mozilla Thuderbird Inbox - [email protected] - Mozilla Thuderbird Inbox - [email protected] - Mozilla Thuderbird (yes it repeats the same one a few times) Inbox - [email protected] - Mozilla Thuderbird I have 7 email accounts but for whatever reason it only made 3 windows. What happened to the one window? When I minimize to tray I got 4 of thunderbird icons. When closing one of them all of the close. My other windows 7(32 bit not 64 bit) only have one instance.

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• Where is php executable on Ubuntu?

  - by user601L

  I have installed apache and php. I know php works as I have tested a simple php file on apache server. I'm writing a simple webserver which should be able to process php files. So what I want to do is once I get a request for a php file, something like 'exec php test.php' and get the output and pass it to the client. As I'm not much into Ubuntu, I don't know where is the php executable (should be in \bin right?) to do it. But there is no php file inside \bin or \usr\bin. When I run 'which php' it shows nothing. How do I do this?

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• Is there any way to hide taskbar labels and not combine taskbar buttons?

  - by Domchi

  There are three options for customizing taskbar buttons in Windows 7: Always combine, hide labels Combine when taskbar is full Never combine Is there any way to hide labels and not combine taskbar buttons? Or even better, to exclude only certain applications from combining? My main problem is that I switch a lot between two instances of a single application, and having to hover over combined icon and then choosing the correct one. Alt-Tabbing is not a good alternative when I'm switching between more than three applications; clicking on taskbar only once is what I'm looking for.

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• Why do partially failed/failing switches fail to pass DHCP?

  - by David Mackintosh

  I've noticed this several times: a switch starts to behave oddly. Usually if the switch doesn't fail outright, what tends to get noticed is that DHCP doesn't work. We had a Linksys SRW-224P fail today. Systems which were still connected worked properly, until it came time to renew their DHCP lease. Once the lease expired, they stopped working, but up until then we couldn't detect a failure. This includes PoE VoIP phones -- they work fine until their lease is up, at which point they're done. I've noticed this on the above-mentioned Linksys, three varieties of 3Com, and possibly half a dozen dumb switches. What is it about DHCP that makes it sensitive to failing switches?

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• Access - Force Form Refresh on New Record

  - by gamerzfuse

  Let me set the stage here a bit: I have an Access project with various buttons, triggers, macros, etc. I needed an Appointment Date field to only show when the button APPOINTMENT MADE is toggled ON. This works great. The problem arises when you submit a form with the APPOINTMENT MADE toggled. Once the record is inserted, the Access file clears all fields, but leaves the Appointment Date enabled, when it should be disabled by default. I have tried the Current, Load, Before Insert, After Insert and many other options on the FORM properties. Am I missing a simple way to force a refresh so the field goes back to it's default DISABLED? Thanks in advance!

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• Best configuration and deployment strategies for Rails on EC2

  - by Micah

  I'm getting ready to deploy an application, and I'd like to make sure I'm using the latest and greatest tools. The plan is to host on EC2, as Heroku will be cost prohibitive for this application. In the recent past, I used Chef and the Opscode platform for building and managing the server infrastructure, then Capistrano for deploying. Is this still considered a best (or at least "good") practice? The Chef setup is great once done, but pretty laborious to set up. Likewise, Capistrano has been good to me over the past several years, but I thought I'd take some time to look around and seeing if there's been any landscape shifts that I missed.

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• Java Champion Dick Wall Explores the Virtues of Scala (otn interview)

  - by Janice J. Heiss

  In a new interview up on otn/java, titled “Java Champion Dick Wall on the Virtues of Scala (Part 2),” Dick Wall explains why, after a long career in programming exploring Lisp, C, C++, Python, and Java, he has finally settled on Scala as his language of choice. From the interview: “I was always on the lookout for a language that would give me both Python-like productivity and simplicity for just writing something and quickly having it work and that also offers strong performance, toolability, and type safety (all of which I like in Java). Scala is simply the first language that offers all those features in a package that suits me. Programming in Scala feels like programming in Python (if you can think it, you can do it), but with the benefit of having a compiler looking over your shoulder and telling you that you have the wrong type here or the wrong method name there.The final ‘aha!’ moment came about a year and a half ago. I had a quick task to complete, and I started writing it in Python (as I have for many years) but then realized that I could probably write it just as fast in Scala. I tried, and indeed I managed to write it just about as fast.”Wall makes the remarkable claim that once Java developers have learned to work in Scala, when they work on large projects, they typically find themselves more productive than they are in Java. “Of course,” he points out, “people are always going to argue about these claims, but I can put my hand over my heart and say that I am much more productive in Scala than I was in Java, and I see no reason why the many people I know using Scala wouldn’t say the same without some reason.”Read the interview here.

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• Desktop application, dependency injection

  - by liori

  I am thinking of applying a real dependency injection library to my toy C#/GTK# desktop application. I chose NInject, but I think this is irrelevant to my question. There is a database object, a main window and several utility window classes. It's clear that I can inject the database into every window object, so here DI is useful. But does it make sense to inject utility window classes into other window classes? Example: I have classes such as: class MainWindow {…} class AddItemWindow {…} class AddAttachmentWindow {…} class BrowseItemsWindow {…} class QueryBuilderWindow {…} class QueryBrowserWindow {…} class PreferencesWindow {…} … Each of the utility classes can be opened from MainWindow. Some utility windows can also be opened from other utility windows. Generally, there might be a really complex graph of who can open whom. So each of those classes might need quite a lot of other window classes injected. I'm worried that such usage will go against the suggestion not to inject too many classes at once and become a code smell. Should I use some kind of a service locator object here?

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• Font corruption: lines through characters

  - by Aibara Iduas

  I have an odd problem where a one-pixel high white line is displayed through certain letters of text. Almost always only a single character type is affected at once, and only in one font size (though that size can change over time). Most of the time things are fine, but this happens several times a day. It's been happening ever since I upgraded to 10.10. I have noticed few patterns: It might be a problem with Firefox (I'm currently using the nightly ppa, but it occurred in 3.6 also) - but this could just be because I spend most of my time on my computer either at a browser or text editors. I seem to remember it happening with the buttons on various Gnome dialogs. It never occurs in text I've typed, be it an email, url bar, etc. In Firefox it happens across tabs, and the problem remains even if they are closed or reloaded; only restarting the program can fix it. Two examples (in the first, only the larger "r" is corrupted): Any help would be appreciated, thanks.

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• How can Highscores be more meaningful and engaging?

  - by Anselm Eickhoff

  I'm developing a casual Android game in which the player's success can very easily be represented by a number (I'm not more specific because I'm interested in the topic in general). Although I myself am not a highscore person at all, I was thinking of implementing a highscore for that game, but I see at least 2 problems in the classical leaderboard approach: very soon the highscore will be dominated by hardcore players, leaving no chance for beginners, who are then frustrated. This is very severe especially in casual games. there is no direct reward for being a loyal player who plays the game over and over again My current idea is to "reset" the highscore every 24 hours (for example) and each day nominate the "player of the day" who then gets a "star". Then there would be some kind of meta-highscore of players with the most stars. That way even beginners might have a chance to be "player of the day" once and continued or repeated play is rewarded much more. The idea is still very rough and there are many problems in the details and the technical implementation but I have a feeling it is a step in the right direction. Do you have creative and new ideas on how to implement highscores? Which games are doing this well / what types of highscores do you find most engaging?

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• how to create a mirror of minimum size to install Ubuntu

  - by Registered User

  I need to create an http url at my laptop to have a Ubuntu installation begin within my laptop on a Xen environment. This is how the final thing will look like http://bderzhavets.wordpress.com/2008/10/28/install-ubuntu-intrepid-server-pv-domu-at-xen-33-port-via-httpgetco-centos-52-dom0/ the host and client are both going to be my laptop, I Google d and came across apt-mirror and some other packages. I do not want to archive entire 15 GB Ubuntu repositories on my machine. It is not possible to use a CD,ISO,loop mounted disk (reason mentioned below). I have tried using netboot image on local machine which failed because if you are attempting to create a virtual machine on a hardware which does not support VT virt-manager installer necessarily needs a URL of this sort http://archive.ubuntu.com/ubuntu/dists/hardy/main/installer-i386/current/images/netboot/ any other option to create guest OS is simply grayed out. The unfortunate part is my Ethernet connections do not work when I boot with Xen-4.0 and a pv-ops Dom0 kernel from Jeremy's tree.Which is where I have to do this work.So I have to create a URL structure which is similar to Ubuntu mirrors.So how can I do this in bare minimum so that at least the console boots and once the console comes I can do some work.

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• Why is Thunar not creating and showing thumbnails of images?

  - by darenw

  Thunar is my main file manager. Normally it automatically creates thumbnail images of all images in the directory being viewed. After experimenting with other Linux distros then installing Arch Linux once and for all, Thunar is not showing thumbs. Image files all get the same generic image icon. Googling turned up some information: Something called gvfs needs to be installed. I have it. Still no go. (Apparently this isn't actually needed anyway.) Someone had this problem and fixed it by running some mime-related command (I didn't save any notes) I did this same command but no go. Checking the obvious: in Thunar's Edit/Preferences, yes, the [x] Show thumbnails is turned on. When I view one image in GIMP or EOG, the generic icon in Thunar is replaced by a thumbnail. But only for that one file I opened.

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• How do I adjust the actual font sizes in Internet Explorer?

  - by Cyberherbalist

  I like having as much stuff on the screen at once as I can. But as a consequence of getting on in years, small font sizes are starting to become a problem. Internet Explorer has the ability to increase the font size of text in webpages (those pages that don't set the font size explicitly). On the main menu, it is View | Text Size. The choices are: Smallest, Smaller, Medium, Larger, Largest. Medium is on many web pages just a tad too small to me. But if I go to Larger the font size is way too big. My question is, is there a way to set these text size jumps differently from what they seem to be?

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• Isopropyl okay to use on MacBook screen?

  - by Archagon

  I've always used a mixture of isopropyl alcohol and distilled water to clean my computer screens (50% water and 50% * 70% isopropyl). From what I understand, these are exactly the same ingredients used in most commercial screen cleaners, perhaps even more diluted. I recently used this solution to wipe off my 2010 MacBook Pro screen, and there don't seem to be any problems, but this support page explicitly says not to use isopropyl. Now I'm worried that I might have inadvertently damaged something. I'm also concerned because I once managed to dissolve the surface rubber lining of one of my mice with the isopropyl solution, and the MacBook Pro display has a thin rubber bezel keeping the glass in place. Why would Apple single out isopropyl on their support page? Should I be concerned?

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• How to automatically render all opaque meshes with a specific shader?

  - by dsilva.vinicius

  I have a specular outline shader that I want to be used on all opaque meshes of the scene whenever a specific camera renders. The shader is working properly when it is manually applied to some material. The shader is as follows: Shader "Custom/Outline" { Properties { _Color ("Main Color", Color) = (.5,.5,.5,1) _OutlineColor ("Outline Color", Color) = (1,0.5,0,1) _Outline ("Outline width", Range (0.0, 0.1)) = .05 _SpecColor ("Specular Color", Color) = (0.5, 0.5, 0.5, 1) _Shininess ("Shininess", Range (0.03, 1)) = 0.078125 _MainTex ("Base (RGB) Gloss (A)", 2D) = "white" {} } SubShader { Tags { "Queue"="Overlay" "RenderType"="Opaque" } Pass { Name "OUTLINE" Tags { "LightMode" = "Always" } Cull Off ZWrite Off // Uncomment to show outline always. //ZTest Always CGPROGRAM #pragma target 3.0 #pragma vertex vert #pragma fragment frag #include "UnityCG.cginc" struct appdata { float4 vertex : POSITION; float3 normal : NORMAL; }; struct v2f { float4 pos : POSITION; float4 color : COLOR; }; float _Outline; float4 _OutlineColor; v2f vert(appdata v) { // just make a copy of incoming vertex data but scaled according to normal direction v2f o; o.pos = mul(UNITY_MATRIX_MVP, v.vertex); float3 norm = mul ((float3x3)UNITY_MATRIX_IT_MV, v.normal); float2 offset = TransformViewToProjection(norm.xy); o.pos.xy += offset * o.pos.z * _Outline; o.color = _OutlineColor; return o; } float4 frag(v2f fromVert) : COLOR { return fromVert.color; } ENDCG } UsePass "Specular/FORWARD" } FallBack "Specular" } The camera used fot the effect has just a script component which setups the shader replacement: using UnityEngine; using System.Collections; public class DetectiveEffect : MonoBehaviour { public Shader EffectShader; // Use this for initialization void Start () { this.camera.SetReplacementShader(EffectShader, "RenderType=Opaque"); } // Update is called once per frame void Update () { } } Unfortunately, whenever I use this camera I just see the background color. Any ideas?

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• Developer momentum on open source projects

  - by sashang

  Hi I've been struggling to develop momentum contributing to open source projects. I have in the past tried with gcc and contributed a fix to libstdc++ but it was a once off and even though I spent months in my spare time on the dev mailing list and reading through things I just never seemed to develop any momentum with the code. Eventually I unsubscribed and got my free time back and uncluttered my mailbox. Like a lot of people I have some little open source defunct projects lying around on the net, but they're not large and I'm the only contributor. At the moment I'm more interested in contributing to a large open source project and want to know how people got started because I find it difficult while working full time to develop any momentum with the code base. Other more regular contributors, who are on the project full-time, are able to make changes at will and as result enter that positive feedback cycle where they understand the code and also know where it's heading. It makes the barrier to entry higher for those that come along later. My questions are to people who actively contribute to large opensource projects, like the Linux kernel, or gcc or clang/llvm or anything else with say a developer head count of more than 10. How did you get started? Was there a large chunk of time in your life that you just could dedicate to working on the project? I know in Linus's case he had a chunk of time (6 months) to get it started. What barriers to entry did you encounter? Can you describe the initial stages of the time spent with the project, from when you had little understanding of the code to when you understood enough to commit regularly. Thanks

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• Computer won't start unless power is removed for ~5 minutes

  - by Paul Tarjan

  I have a fairly standard 2-year old desktop computer (quad-core intel, single hard drive, decent video card, 300W power supply) which recently started acting up. I'm not sure what the cause is, so hopefully you can help. Sometimes (once a week-ish) I press the power button and nothing happens. No blinking, no sounds, no nothing. If I remove the power cord (or flip the switch on the power supply) I hear a capacitor discharge. If I leave it in the "no power at all" state for about 5 minutes then I can put the plug back in and the computer works perfectly. What is the issue? What do you think I have to replace?

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• Excel trendline accuracy

  - by Rook

  This is a problem I have every once in a while, and it annoys me tremendously, beacuse I have always to recheck every trendline I get. An example: r L (mm) 30,00 97,0 60,00 103,2 90,00 106,0 110,00 101,0 125,00 88,0 140,00 62,0 148,00 36,7 152,50 17,0 Upon drawing a trendline (using 3rd order polynomial regression type) with r on the x axis, and L on the y one, Excel will give the formula y = -0,0002x³ + 0,0341x² - 1,8979x + 128,73 with R² = 0,994. If I interpolate values using that formula for the same values of r as the ones the formula was derived from, I get r y (mm) 30,00 97,083 60,00 94,416 90,00 88,329 110,00 66,371 125,00 33,68 140,00 -17,416 148,00 -53,5912 152,50 -76,97725 which are quite different? Why does this happen? What is the reason for it?

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• Using curly braces with a standard pc keyboard on a mac laptop

  - by raoulsson

  I have a standard PC keyboard connection to my Mac laptop. All keys work fine but the special characters that need "Alt-Gr" as accelerator keys would not work. I have a Swiss layout where the curly braces are such special keys. However I need them all the time and having to get used to a different layout is too painful (I'd rather get used to a US Layout once and for all). Does anyone have an idea how to switch this? Note: I have managed to switch the option and the command key, so that's not my problem.

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• Make Windows Task Scheduler alert me on fail

  - by acidzombie24

  I have an automated script that pulls backups from my website to my local computer. Once my server was down, another time i accidentally move my script. How do i make Windows Task Scheduler tell me with the script fails (or doesnt run/not found)? I dont care if a prompt comes up, an email or something that appears on my desktop. I want to be notified if something goes wrong. On my server crontab emails me about errors which is great. I want something like that on my windows 7 local computer.

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• Any mates have same plan as me. Focust on tech whole life, no wife, no kids [closed]

  - by Anders Lind

  I am about 30 years old, c++ programmer. Kernel hacker. Living in east coast US. Day by day, night by night. I am in front of my monitor, typing code on my hhkb, scratching idea on my notebook. In my spare time, I play piano sometimes. Go to some classical concert once a month. Basically having a happy life. One concern is I dont have gf. I dont have wife nor kids. My parents start to worry about this. Occasionally they will ask my status. they wont tell me to do anything. But I can see their worries. So, my question is, is my life normal? How many mates think same as me? (I only know rms is single, has no kids, and having a happy life. But I am way worse than him. compare to him, I am nothing. If I am as successful as him. I won;t ask this question here.)

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• Demantra Implementation Tip Windows and Unix or Linux

  - by user702295

  Hello!  Are you implementing using a third party or consulting resources?   Recently we have seen some cases where customers no longer have a windows installation.  After the initial install and configuration, once the instance has gone live, the windows install is either deleted or most likely no longer with the customer as the same was installed on the implementers' laptop to start with. As a result when support comes back requesting the customer to apply a patch and/or upgrade they do not have a windows installation.  This has started happening after Oracle Demantra gave them the option to configure the engine on Unix.  Workaround: It is advisable that the customer keep their Windows installation intact for further patching and/or upgrade.  It is aslo possible that the implementer had installed Demantra on his Windows box and you do not have access to it any more.  It is possible that with the web and engine on Unix, and the silent installer having downloaded all the executable for Business Modeler, to work on the User's client machine, you may no longer need the windows install. I have not tested the above 

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• Have You Checked Our BI Publisher Channel at Youtube ?

  - by kanichiro.nishida

  These days, more and more people watching video online rather than reading. Steve Jobs once said people don’t read anymore. Well, I love books and still read a lot either on books, magazine, iPad, MacbookPro, or whatever the medium shows me letters! But I have to admit, sometimes it’s much easier to understand especially something like How-To by just watching video clips than reading it. And this is why we started our BI Publisher Channel at Youtube last summer. Since then we have uploaded over 10 video clips so far and and now we’re gearing up to add more and more clips. Now, we’re in a middle of finishing up our work for the next 11G 1st patchset release, which should be coming soon and will have a lot of great new features that I can’t wait to talk to you guys about. And of course we’re preparing introduction and How-Top clips. So please subscribe the BI Publisher channel now if you haven’t done yet and stay tuned for the new clips! http://www.youtube.com/user/bipublisher Also, we’d love to hear your comments for each clip, so please don’t forget leaving your comments there after you watch!

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