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  • Does /boot safe on top of a lvm LV (logical volume)?

    - by fantoman
    Title already asked the question. More specifically, I read in some documents that logical volumes are nice in general but not for /boot in a linux system. They say that bootloaders don't understand LVM volumes, so create a separate partition for /boot out of lvm. I recently installed Ubuntu server (9.10) for my home server, but by default /boot is created in the LVM. Everything is fine now, but I am not sure it is safe to use /boot in LVM. Second question is do I really need a physical partition (volume)(pv) for /boot or is it equally fine if I put it into a logical volume (lv) on top of a single shared volume group. Thanks in advance.

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  • What do you need to know to be a world-class master software developer? [closed]

    - by glitch
    I wanted to bring up this question to you folks and see what you think, hopefully advise me on the matter: let's say you had 30 years of learning and practicing software development in front of you, how would you dedicate your time so that you'd get the biggest bang for your buck. What would you both learn and work on to be a world-class software developer that would make a large impact on the industry and leave behind a legacy? I think that most great developers end up being both broad generalists and specialists in one-two areas of interest. I'm thinking Bill Joy, John Carmack, Linus Torvalds, K&R and so on. I'm thinking that perhaps one approach would be to break things down by categories and establish a base minimum of "software development" greatness. I'm thinking: Operating Systems: completely internalize the core concepts of OS, perhaps gain a lot of familiarity with an OSS one such as Linux. Anything from memory management to device drivers has to be complete second nature. Programming Languages: this is one of those topics that imho has to be fully grokked even if it might take many years. I don't think there's quite anything like going through the process of developing your own compiler, understanding language design trade-offs and so on. Programming Language Pragmatics is one of my favorite books actually, I think you want to have that internalized back to back, and that's just the start. You could go significantly deeper, but I think it's time well spent, because it's such a crucial building block. As a subset of that, you want to really understand the different programming paradigms out there. Imperative, declarative, logic, functional and so on. Anything from assembly to LISP should be at the very least comfortable to write in. Contexts: I believe one should have experience working in different contexts to truly be able to appreciate the trade-offs that are being made every day. Embedded, web development, mobile development, UX development, distributed, cloud computing and so on. Hardware: I'm somewhat conflicted about this one. I think you want some understanding of computer architecture at a low level, but I feel like the concepts that will truly matter will be slightly higher level, such as CPU caching / memory hierarchy, ILP, and so on. Networking: we live in a completely network-dependent era. Having a good understanding of the OSI model, knowing how the Web works, how HTTP works and so on is pretty much a pre-requisite these days. Distributed systems: once again, everything's distributed these days, it's getting progressively harder to ignore this reality. Slightly related, perhaps add solid understanding of how browsers work to that, since the world seems to be moving so much to interfacing with everything through a browser. Tools: Have a really broad toolset that you're familiar with, one that continuously expands throughout the years. Communication: I think being a great writer, effective communicator and a phenomenal team player is pretty much a prerequisite for a lot of a software developer's greatness. It can't be overstated. Software engineering: understanding the process of building software, team dynamics, the requirements of the business-side, all the pitfalls. You want to deeply understand where what you're writing fits from the market perspective. The better you understand all of this, the more of your work will actually see the daylight. This is really just a starting list, I'm confident that there's a ton of other material that you need to master. As I mentioned, you most likely end up specializing in a bunch of these areas as you go along, but I was trying to come up with a baseline. Any thoughts, suggestions and words of wisdom from the grizzled veterans out there who would like to share their thoughts and experiences with this? I'd really love to know what you think!

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  • Mobile web app, styling in percentages; I can't get height to work [migrated]

    - by Mick79
    I am building a mobile app for a band and obviously want it to display well in all the plethora of handsets out there today. I built it at first for my own device and it looks and works great, so now I am reworking it in percentages so that it works in all devices. I have a slider (jquerytools) going on and if i set width to 100% then it is perfectly wide in my iphone and my ipad... success, however I am not having any luck with height. It seems to only accept a height in px. If i set a height in percent it just doesn't display. any ideas? #header{ width:100%; height:198px; position:relative; z-index: 20; box-shadow: 0 0 10px white; } .scrollable { /* required settings */ position:relative; overflow:hidden; width: 100%; height:100%; box-shadow: 0 0 20px purple; z-index: 20; } .scrollable .items { /* this cannot be too large */ width:500%; height:100%; position:absolute; clear:both; box-shadow: 0 0 30px green; } .items div { float:left; width:20%; height:100%; } /* single scrollable item */ .scrollable img { float:left; width:100%; height:100%; /* height:198px; */ } /* active item */ .scrollable .active { border:2px solid #000; position:relative; cursor:default; } `

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  • Cannot download or send MMS

    - by CGFoX
    I have a Huawei Honor with Android 4.0.3. I got a plan at AT&T that includes 200 messages (both SMS and MMS) per month. Unfortunately I can neither receive nor send MMS. When I receive one, there's a download-button. But when I hit download it doesn't do anything, even when I got internet connection via wifi. When I try to send a MMS it only says "sending...", but nothing happens. My guess is that I didn't configure the settings correctly, but I couldn't find anything useful online. Also I don't have a single APN. Maybe I need to create one? Thanks for your help!

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  • php-cgi got SIGKILL on burst.net VPS?

    - by Shawn
    I got an VPS at burst.net, very cheap one, but this doesn't matter. The strange behavior of it is, the php-cgi process, which started using lighthttpd's spawn-cgi, dies every a few minutes. however, other processes are fine and great, even include a java process, and I'm sure there is no "out of memory" issue, so it's not killed by OOM killer. I used strace to trace the process, and found out it was killed by SIGKILL, hence no single log was left on the disk, just dies suddenly. Is there anyway I can find out what process/thing sent the SIGKILL to the poor php process? Filed a ticket with the vendor, but they said they won't care. strace -p 7176 Process 7176 attached - interrupt to quit wait4(-1, <unfinished ...> +++ killed by SIGKILL +++

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  • Seek first to understand, then to be understood

    - by BuckWoody
    One of the most important (and most difficult) lessons for a technical professional to learn is to not jump to the solution. Perhaps you’ve done this, or had it happen to you. As the person you’re “listening” to is speaking, your mind is performing a B-Tree lookup on possible solutions, and when the final node of the B-Tree in your mind is reached, you blurt out the “only” solution there is to the problem, whether they are done or not. There are two issues here – both of them fatal if you don’t factor them in. First, your B-Tree may not be complete, or correct. That of course leads to an incorrect response, which blows your credibility. People will not trust you if this happens often. The second danger is that the person may modify their entire problem with a single word or phrase. I once had a client explain a detailed problem to me – and I just KNEW the answer. Then they said at the end “well, that’s what it used to do, anyway. Now it doesn’t do that anymore.” Which of course negated my entire solution – happily I had kept my mouth shut until they finished. So practice listening, rather than waiting for your turn to speak. Let the person finish, let them get the concept out, give them your full attention. They’ll appreciate the courtesy, you’ll look more intelligent, and you both may find the right answer to the problem. Share this post: email it! | bookmark it! | digg it! | reddit! | kick it! | live it!

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  • Are there any good resources for refactoring existing C# code to use LINQ while keeping your tests passing?

    - by Paddyslacker
    I've been teaching myself a little LINQ and an exercise I thought would be useful was to take my existing Project Euler C# code, which I built using Test Driven Development and gradually convert it to LINQ. I realise that LINQ is not always the best solution for all of the Project Euler problems, but I don't want to get into that here. I'm wondering whether or not it's feasible to refactor "traditional" OO C# code to use LINQ and functional programming syntax whilst keeping all of your tests passing. I can't find a way to make the tiny steps I'm used to making using TDD when converting to LINQ and this is a roadblock for me. I seem to have to make large changes to come up with a single function that I then replace whole chunks of my code with. I realise I could write this from scratch in LINQ, but in the real world, I'd like to be able to replace parts of my existing C# code to take advantage of LINQ where appropriate. Has anyone been successful with this approach? What resources did you find useful for refactoring existing C# code to use LINQ whilst taking a Test Driven Development approach?

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  • Keyboard glitches for some when Ctrl key is pressed

    - by user270716
    I'm having some problems with my keyboard, if I press the Ctrl key it glitches for some time. For example, if I press Ctrl and press Tab while it's still glitched the computer shuts down as if i pressed the Power On/Off button. If I press a it "presses" Alt, A and a symbol I can't remember, if I recall correctly it's a currency symbol. If I press Ctrl again it "presses" the ' key. I'm using Windows 8 Single Language 64 bits with a ABNT2 keyboard. The processor is a Intel Celeron G530 with 2 GB of RAM.

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  • Issues trying to download Windows 8.1 using official downloader

    - by Aviral Singh
    I had been trying to download Windows 8.1 ISO from the last 3-4 days but a silly issue is preventing me to download it.As many posts over the internet explain,I tried to use generic keys to download(as I don't have Windows 8),but the installer always shows "We can't connect right now,please check you internet connection.".Isn't it silly?,I have a working internet connection.No matter whatever key I use it always ends at this message.I've tried every single generic key,and almost every key was accepted by the installer as valid,but then the message. Can anyone please explain why is this happening and any workarounds ?

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  • How do you interpret `strace` on an apache process returning `restart_syscall`?

    - by indiehacker
    We restart an apache server every day because RAM usage reaches its limit. Though of value See this serverfault answer, I dont think lowering the MaxClients in the apache configuration is a solution to the unknown root problem. Can you make sense out of the below data? Below is an extract of what $top with M returns: 20839 www-data 20 0 1008m 359m 22m S 4 4.8 1:52.61 apache2 20844 www-data 20 0 1008m 358m 22m S 1 4.8 1:51.85 apache2 20842 www-data 20 0 1008m 356m 22m S 1 4.8 1:54.60 apache2 20845 www-data 20 0 944m 353m 22m S 0 4.7 1:51.80 apache2 and then investigating a single process with $sudo strace -p 20839 returns only this one line, which is cryptic, for me: restart_syscall(<... resuming interrupted call ...> <unfinished ...> Any insights? Thanks.

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  • Repeat the csv header twice without "Append" (PowerShell 1.0)

    - by Mark
    I have prepared a PowerShell script to export a list of system users in CSV format. The script can output the users list with Export-csv with single header row (the header row at top). However my requirement is to repeat the header row twice in my file. It is easy to achieve in PowerShell 3.0 with "Append" (e.g. $header | out-file $filepath -Append) Our server envirnoment is running PowerShell 1.0. Hence I cannot do it. Is there any workaround? I cannot manually add it myself. Thank you.

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  • How can I too many files upload more fast way to Cloud files in Rasckspace?

    - by andy kim
    I have a lot of image files, it's all I want to upload to RackSpace cloud files about a million in a single directory the fastest and most efficient way. but I'm use uploading python-cloudfiles script is very slow and I want to know different ways or python script code. because one by one connection upload is very slow. I think one files tar and uncompress directory is better way. but cloudfiles do not support this way. Who know any other way?

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  • Higher Performance With Spritesheets Than With Rotating Using C# and XNA 4.0?

    - by Manuel Maier
    I would like to know what the performance difference is between using multiple sprites in one file (sprite sheets) to draw a game-character being able to face in 4 directions and using one sprite per file but rotating that character to my needs. I am aware that the sprite sheet method restricts the character to only be able to look into predefined directions, whereas the rotation method would give the character the freedom of "looking everywhere". Here's an example of what I am doing: Single Sprite Method Assuming I have a 64x64 texture that points north. So I do the following if I wanted it to point east: spriteBatch.Draw( _sampleTexture, new Rectangle(200, 100, 64, 64), null, Color.White, (float)(Math.PI / 2), Vector2.Zero, SpriteEffects.None, 0); Multiple Sprite Method Now I got a sprite sheet (128x128) where the top-left 64x64 section contains a sprite pointing north, top-right 64x64 section points east, and so forth. And to make it point east, i do the following: spriteBatch.Draw( _sampleSpritesheet, new Rectangle(400, 100, 64, 64), new Rectangle(64, 0, 64, 64), Color.White); So which of these methods is using less CPU-time and what are the pro's and con's? Is .NET/XNA optimizing this in any way (e.g. it notices that the same call was done last frame and then just uses an already rendered/rotated image thats still in memory)?

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  • Does lesser wide screen fit better than a large one?

    - by artaxerxe
    About 3 weeks ago I changed my job. At the former workplace, I had 2 monitors for doing programming (GUI and core programming). Here, at the place where I am, the administrators gave me a laptop (15.6 inch) and wanted to provide me a wider screen additional to the laptop's one. I said that for now I want to test as it is, with the laptop's screen. I also want to mention, that in the current job I'm not targeted for GUI development. My feeling until now (but it can be just a feeling) is that working on this single not so wide screen, I'm not so weary after a full day work as I was with 2 wide monitors. Does anyone have any recommendations on this problem? Does lesser screens (in my case exclusively 15.6 inch vs 20 inch screens) affect your eyes? If anyone have any knowledge about, please feel free to say what's your opinion. P.S. I think that's a good site for this kind of question. Otherwise, please guide me on what site from StackExchange should I put it. Thanks.

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  • Help with design structure choice: Using classes or library of functions

    - by roverred
    So I have GUI Class that will call another class called ImageProcessor that contains a bunch functions that will perform image processing algorithms like edgeDetection, gaussianblur, contourfinding, contour map generations, etc. The GUI passes an image to ImageProcessor, which performs one of those algorithm on it and it returns the image back to the GUI to display. So essentially ImageProcessor is a library of independent image processing functions right now. It is called in the GUI like so Image image = ImageProcessor.EdgeDetection(oldImage); Some of the algorithms procedures require many functions, and some can be done in a single function or even one line. All these functions for the algorithms jam packed into ImageProcessor can be pretty messy, and ImageProcessor doesn't sound it should be a library. So I was thinking about making every algorithm be a class with a shared interface say IAlgorithm. Then I pass the IAlgorithm interface from the GUI to the ImageProcessor. public interface IAlgorithm{ public Image Process(); } public class ImageProcessor{ public Image Process(IAlgorithm TheAlgorithm){ return IAlgorithm.Process(); } } Calling in the GUI like so Image image = ImageProcessor.Process(new EdgeDetection(oldImage)); I think it makes sense in an object point of view, but the problem is I'll end up with some classes that are just one function. What do you think is a better design, or are they both crap and you have a much better idea? Thanks!

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  • Number of malicious attacks defended/done on the average user daily [closed]

    - by DalexL
    As a web hoster, it is very easy to notice the large amounts of exploit/abuse attempts done on my servers. Out of curiosity, how often are these attempts done on the average user? I'm assuming almost all of them are prevented just by simple security protocols in place by their browsers, local network, etc. How many attempts, on average, are committed against a single user daily through any method? (email, internet, downloads, etc.)? If known, what percentage of these things are blocked by the average users security? I tried googling but I was having a hard time getting the right search terms together.

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  • HTML5 - Does it have the power to handle a large 2D game with a huge world?

    - by user15858
    I have been using XNA game studio, but due to private reasons (as well as the ability to publish anywhere & my heavy interest in isogenic engine), I would like to switch to HTML5. However, I have very high 2D graphic demands for my game. The game itself will have a HDD size of anywhere between 6GB (min) to 12GB (max) which would be a full game deployed offline. The size of the images aren't significantly large, so streaming would be entirely possible if only those assets required were streamed as needed. The game has a massive file size because of the sheer amount of content. For some images or spritesheets, they would be quite massive. (ex. a very large Dragon, which if animated in a spritesheet would be split into two 4096x4096 sheets or one 8192x8192 sheet). Most assets would be very small, and about 7MB for a full character with 15 animations in every direction (all animations not required immediately) so in the size of a few hundred KB to download before the game loads. My question, however, is if the graphical power of HTML5 is enough to animate several characters on screen at once, when it flips through frames quite rapidly. All my sprites have about 25 frames per animation, 5 directions (a spritesheet for each direction & animation), and run at 30fps. Upon changing direction, animation, or a new character entering, spritesheets would change and be constantly loading/unloading. If I pack all directions in a single sheet, it would be about 2048x2048 per sheet. Most frameworks have no problem with this, but I am afraid from what I read that HTML5's graphical capabilities will limit me. Since it takes significant time simply to animate characters in any language, I'd like a quick answer.

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  • Using Ubuntu isn't worth it for me, Windows works best.

    - by user72475
    Welcome to Ubuntu and the lack of support( 12.04 LOS ). If I say Ubuntu 12.04 is a so so broken OS, I will get flamed. But if I ask for help, I can here the crickets chirruping. Unix/Linux user have an attitude and really don't like to share info. Because if they help everyone, they wouldn't have anyone to call a noob. Then their moms basement wouldn't be the same without being able to flame Ubuntu noobs. I am going back to windows I don't have to spend all day trying to get a single app or option to work. Sure Ubuntu is fun to tinker with but it is not a professional consumer OS. Windows is a better consumer based os, I don't need server software(Unix) that's been broken and hacked to be used like windows(Ubuntu). All the time I have wasted trying to get Ubuntu to work CORRECTLY cost me more the Windows 7 ultimate by far. HOW MUCH IS YOUR TIME WORTH. If you are unemployed and have all night to set in your moms basement and flame noobs then Ubuntu is for you. If you want to use an external monitor on your notebook or download Adobe reader use Windows 7. When are we going to stop complaining about corporate giants like Microsoft and admit they have great products. Gave it a shot, did work for me, I have better things to do with my time. bye Ubuntu

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  • how to compare files/directories of 2 separate solaris boxes ?

    - by chz
    Hi Friends I have 2 solaris boxes and I need to check certain directories (on local filesystem and mounted nfs) to make sure that they match up on both boxes and to delete or move the other mismatches to elsewhere on the local filesystem. I investigated for unix commands like rsync, and tree but it appears that these commands are not supported on my Solaris boxes. What is the best approach to this problem with the least pain to solve it ? to use rsync, tree and then diff the outputs or find ? I have trouble limiting the find command to certain directories as there are mounted folders that contain too many xml files that I don't care to much in that directory. What's the find command to search multiple directory paths on a single find command. Thanks Sincerely

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  • How to Increase Memory Allocated to IIS .NET Application?

    - by Mark Hansen
    We are using Windows 2008 R2 and IIS 7 running on Amazon EC2. IIS is running a single .NET application written in C#. We are having performance issues and I want to give the application more memory, but I cannot figure out how to do it. How do I control the amount of memory that the CLR gets? I'm a total newbie with IIS, .NET and the CLR. If I were working with Java, I would just use the -Xmx flag to increase the memory available to the JVM (e.g., -Xmx3000m for 3GB). But, I cannot seem to figure out how to do this in the Windows world.

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  • Game programming : C# or C++?

    - by Chronix
    Ok so the faq says : "What language should I learn next? (Unless you have a specific requirement and don't know which language meets that requirement.)" so I guess this is not against the rules of questions. So, I've decided what I really want is to do Game Programming. So the question is, as a 18 years old who wants to learn self taught programming, what is the most suited programming language between C# and C++? ( I should state that I don't care about unix because I believe windows will be still the most used os ) I know the basics of C++, but none about C#. I know that C++ has more tutorials guides, dlls and stuff like that, while C# doesn't, but it's far easier to learn and to use for a single person to develop a program, but I've read even if the program is obfuscated it's easy to get the source of it. Well, I kinda want to focus on basic a lot first, I must say that I have a preference for C++ just because it feels more suitable to me, but I must consider that I work alone.. So even if I like it, it may not be the best thing to do. I am really not sure of which one to go for, i've read a lot of threads on various websites and it looks like C# is becoming more popular than C++. But yeah, that said, I also specified I want to do Game Programming. So I need to know some better points than just "C# is easier because of .net memory handling while C++ isnt" because I couldn't just find it. I hope the thread won't be closed because I've read the faq and I have a specific requirement. Thank you, and if you need more details you're free to ask me, but I think just by saying game programming and that I'd work alone should be enough!

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  • Internet connection issues after installing Windows Phone 8 SDK

    - by Mosquito
    first of all I must admit, that I'm not good in all this network stuff. I am using Windows 8 OS. On my laptop (Lenovo G570) I have installed Windows Phone 8 SDK and shortly after this I started having weird issues with internet connection. When I start my laptop, internet usually works fine, but after a few minutes it starts slowing down so much, that I'm not able to open a single page. Rebooting doesn't work, after several disabling and enabling network adapter, it usually works again for a few minutes and then again it stops. I'm sure it has something to do with Windows Phone 8 SDK, because problems started with this. With SDK there was also installed "vEthernet (Internal Ethernet Port Windows Phone Emulator Internal Switch)" network adapter. It is worth to note that problems occur mostly in my school network, not at home. Both at home and school I am using Wi-Fi connection. I hope the information given are enough to help me. Thanks in advance for any answers!

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  • Did I Inadvertently Create a Mediator in my MVC?

    - by SoulBeaver
    I'm currently working on my first biggish project. It's a frontend facebook application that has, since last Tuesday, spanned some 6000-8000 LOC. I say this because I'm using the MVC, an architecture I have never rigidly enforced in any of my hobby projects. I read part of the PureMVC book, but I didn't quite grasp the concept of the Mediator. Since I didn't understand and didn't see the need for it, my project has yet to use a single mediator. Yesterday I went back to the design board because of some requirement changes and noticed that I could move all UI elements out of the View and into its own class. The View essentially only managed the lifetime of the UI and all events from the UI or Model. Technically, the View has now become a 'Mediator' between the Model and UI. Therefore, I realized today, I could just move all my UI stuff back into the View and create a mediator class that handles all events from the view and model. Is my understanding correct in thinking that I have devolved my View as it currently is (handling events from the Model and UI) into a Mediator and that the UI class is what should be the View?

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  • Motivation for a service layer (instead of just copying dlls)?

    - by BornToCode
    I'm creating an application which has 2 different UIs so I'm making it with a service layer which I understood is appropriate for such scenario. However I found myself just creating web methods for every single method I have in the BL layer, so the services basically built from methods that looks like this: return customers_bl.Get_Customer_Prices(customer_id); I understood that a main point of the service layer is to prevent duplication of code so I asked myself - why not just import the BL.DLL (and the dal.dll) to the other UI, and whenever making a change re-copy the dlls, it might not be so 'neat', but still less hassle than one more layer? {I know something is wrong in my approach, I'm probably missing the importance of service layer, I'd like to get more motivation to create another layer, especially because as it is I found that many of my BL functions ALREADY looks like: return customers_dal.Get_Customer_Prices(cust_id) which led me to ask: was it really necessary to create the BL just because on several functions I actually have LOGIC inside the BL?} so I'm looking for more motivation to creating ONE MORE layer, I'm sure it's not just to make it more convenient that I won't have to re-copy the dlls on changes? Am I grasping it wrong? Any simple guidelines on how to design service layer (corresponding to all the BL layer functions or not? any simple example?) any enlightenment on the subject?

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  • Ways to deduplicate files

    - by User1
    I want to simply backup and archive the files on several machines. Unfortunately, the files have some large files that are the same file but stored differently on different machines. For instance, there may a few hundred photos that were copied from one computer to the other as an ad-hoc backup. Now that I want to make a common repository of files, I don't want several copies of the same photo. If I copy all of these files to a single directory, is there a tool that can go thru and recognize duplicate files and give me a list or even delete one of the duplicates?

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