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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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• How to generate good serials for DNS zones with Puppet?

  - by Bittrance

  My tradition is to set all zone serials to the timestamp at modification. Now that Puppet is my new religion, I want to set serial timestamps when building zone files from exported resources. A somewhat trivialized example may look like this: file { "/tmp/dafile": content = inline_template("<%= Time.now.to_i %>"), } The problem with this approach is that content will be different all the time, which will (ultimately) provoke rebuilding of zone files on each puppet config poll. Is there some way I can insert a timestamp without it being included in the data that is compared against previous state?

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• What is involved with writing a lobby server?

  - by Kira

  So I'm writing a Chess matchmaking system based on a Lobby view with gaming rooms, general chat etc. So far I have a working prototype but I have big doubts regarding some things I did with the server. Writing a gaming lobby server is a new programming experience to me and so I don't have a clear nor precise programming model for it. I also couldn't find a paper that describes how it should work. I ordered "Java Network Programming 3rd edition" from Amazon and still waiting for shipment, hopefully I'll find some useful examples/information in this book. Meanwhile, I'd like to gather your opinions and see how you would handle some things so I can learn how to write a server correctly. Here are a few questions off the top of my head: (may be more will come) First, let's define what a server does. It's primary functionality is to hold TCP connections with clients, listen to the events they generate and dispatch them to the other players. But is there more to it than that? Should I use one thread per client? If so, 300 clients = 300 threads. Isn't that too much? What hardware is needed to support that? And how much bandwidth does a lobby consume then approx? What kind of data structure should be used to hold the clients' sockets? How do you protect it from concurrent modification (eg. a player enters or exists the lobby) when iterating through it to dispatch an event without hurting throughput? Is ConcurrentHashMap the correct answer here, or are there some techniques I should know? When a user enters the lobby, what mechanism would you use to transfer the state of the lobby to him? And while this is happening, where do the other events bubble up? Screenshot : http://imageshack.us/photo/my-images/695/sansrewyh.png/

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• Is text-only mode a saving or a problem for battery savings?

  - by Robottinosino

  A friend is flying to the US from Europe and asked me a very thought-provoking question, which I am not remotely able to answer with substance so I am asking it here: How to absolutely maximise battery life on an Ubuntu (laptop) install? do not rush to mark this as duplicate, there is an important point here: does -GNOME- help or worsen battery life? Let me provide some context: The only task he needs to perform is: edit text files in Vim. He is unsure whether running GNOME will drain his battery life more or actually save him some battery life given the smarts of GNOME's power management features like "switch this peripheral to -power save- after X minutes..." (GNOME might just be a configuration front-end for settings that are governed by command-line utils for all I know?) He could perfectly well boot the system in text-only mode and use the automatic 6 virtual consoles for his needs, if that's a saving at all over running tmux (I think so because of all the smart buffering/history/etc the latter does by default?) Exactly how would you advise him to run his laptop during his flight? What I told him already: power off WiFi in the BIOS, not from the "GUI" power off Bluetooth switch off the courtesy light and use low monitor brightness play music off of his phone, not mp3blaster do not use his tiny portable mouse (and do not attach any other USB gimmicks like "screen light", etc) stop development services he will not be using, especially apache2, tomcat, dovecot, postgresql, etc. Potentially: - switch off his cron jobs? (he does an rsync + tar + 7za of his "work in progress" every so often) I think the above is standard stuff one could get off StackExchange, and with many duplicates... the core of this question is, I think: __ will running Ubuntu in text-only mode be a saving in terms of battery life or a problem? why? (provide some technical arguments) __ I think it will be a saving but I am also scared about "other things" detecting and enabling advanced chipset power management features only when some services are started.. and fear these "services" may be off in text-only mode?

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• How do I capture and playback http web requests against multiple web servers?

  - by KevM

  My overall goal is to not interrupt a production system while capturing HTTP Posts to a web application so that I can reverse engineer the telemetry coming from a closed application. I have control over the transmitter of the HTTP Posts but not the receiving web application. It seems like I need a request "forking" proxy. Sort of a reverse proxy that pushes the request to 2 endpoints, a master and slave, only relaying the response from the master endpoint back to the requester. I am not a server geek so something like this may exist but I don't know the term of art for what I am looking for. Another possibility could be a simple logging proxy. Capture a log of the web requests. Rewrite the log to target my "slave" web application. Playback the log with curl or something. Thank you for your assistance.

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• Dangers of the pyton eval() statement

  - by LukeP

  I am creating a game. Specifically it is a pokemon battle simulator. I have an sqlite database of moves in which a row looks something like: name | type | Power | Accuracy | PP | Description However, there are some special moves. For said special moves, their damage (and other attributes not shown above, like status effects) may be dependant on certian factors. Rather than create a huge if/else in one of my classes covering the formulas for every one of these moves. I'd rather include another column in the DB that contains a formula in string form, like 'self.health/2'(simplified example). I could then just plug that into eval. I always see people saying to stay away from eval, but from what I can tell, this would be considered an acceptable use, as the dangers of eval only come into play when accepting user input. Am I correct in this assumption, or is there somthing i'm not seeing.

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• Are Rackspace's Cloud Servers really cloud hosting?

  - by sopppas

  I may be confused about what cloud hosting really is... I asked Rackspace how its Cloud Server (CS) 256MB/10GB compares to Slicehost's 256slice VPS, and they said it's exactly the same (only different billing and BW). I know they are the same company. So, why do they call it Cloud Server? Isn't it just a collection of VPS (virtual private servers)? For me, cloud hosting would be: if I need any additional horsepower at any given time, the cloud would automatically stack more VPS and then charge me at the end of the month for the surplus of resources. Reading Rackspace's info, it looks like it's for me to decide when to stack more CS and that its Cloud Servers don't AUTOMATICLY scale up. Am I confusing things?

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• Why do mapped drives only reappear after logging out and back in, and not after a reboot?

  - by razumny

  I work in a corporate environment, where we use mostly Windows 7 Professional computers, though some legacy applications are still being run on Windows XP. We have security in place on the network not to allow access to network resources to computers that are not members of Active Directory. When logging in, our users get their home folder and a common network drive mapped to H: and F:, respectively. Sometimes, this does not happen, and the drives are not mapped. The solution is to have the user log off, and back in to Windows. If they reboot, the drives remain unmapped. Does anyone know why this may be?

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• Can a network interface be configured to have a default gateway for UDP packets?

  - by Vaibhav

  It is quite possible that my question may not make a lot of sense. I apologize, but I am not a networking guy, and that's my excuse. To elaborate, WikiPedia defines "Default Gateway" as a node on a "TCP/IP" network. And the way it works is that if a network interface is sending a packet to an IP address not present on its subnet, it sends it out to the default gateway (which then knows what to do with that packet). Is this true if a UDP packet (datagram) is involved? I mean, if my network interface is sending a UDP packet to an IP address that is not present on its subnet, would it automatically send it to the Default Gateway as well?

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• Finding the length of files and file path of directory structure in a Linux file system.

  - by Robert Nickens

  I have a problem on a Linux OS running a version of SMB where if the absolute path to a directory within a Shared Folder is greater than 1024 bytes and the filename component is greater than 256 bytes the SMB service crashes and locks out all other services for network access like, SSH and FTP rendering the machine mute. To keep the system for crashing I’ve temporarily moved a group of folders where I think the problem path may be located outside of Shared Folder. I need to find the file and file path that exceeded this limitation and rename them or remove them allowing me to return a bulk of the files to the Shared Folder. I’ve tried the find and grep commands without success. Is there a chain of commands or script that I can use to hunt down the offending files and directory? Please advise.

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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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• Is it better to use a crowded 2.4GHz Wi-Fi channel 1, 6, 11 or "unused" 3, 4, 8, or 9?

  - by Luke

  I understand that 2.4GHz Wi-Fi channels overlap, and that the only non-overlapping channels in the US are 1, 6, and 11. Generally, my signal strength on channels 1, 6, and 11 are much stronger than my neighbors' on the same channel. However, several of the channels may have 4 or 5 others on that same channel. In this scenario, is it better to use 3, 4, 8, or 9? Or is it better to use the crowded channels 1, 6, and 11? As a secondary question, does it even matter that my signal strength is much higher than theirs? Related: Why use wifi channels other than 1, 6 or 11?

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• How to setup Apache 2.2 (prefork) with mod_fcgid to test a C++ application?

  - by skyeagle

  I have written my first fastcgi application (C/C++), and I need to test it to ensure that it is behaving the way I expect it to. I have searched for examples on setting up Apache 2.2. with mod_fcgid, but all of teh tutorials etc I have seen, relate to PHP, Python, Perl etc. Is anyone aware of a resource that shows how I may setup Apache to use mod_fcgid (NOT mod_fastcgi) to test my binary? If no online resource is available (I'd be surprised), then could someone please point out the steps required to do the testing?

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• Image an entire computer

  - by DalexL

  I want to start doing a computer repair. I know that some issues may arise (what if I do something wrong and ruin the entire computer?). I'm not saying I'm not confident in my work, but accidents do happen sometimes. Now, the best solution this problem would be to simply just backup their entire computer and restore it if anything goes wrong. If I have an external HD, are there any available methods to create an entire image for the computer so no matter what I do, I can just reload it's last state?

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• How to setup Apache 2.2 (prefork) with mod_fcgid to test a C++ application?

  - by skyeagle

  I have written my first fastcgi application (C/C++), and I need to test it to ensure that it is behaving the way I expect it to. I have searched for examples on setting up Apache 2.2. with mod_fcgid, but all of teh tutorials etc I have seen, relate to PHP, Python, Perl etc. Is anyone aware of a resource that shows how I may setup Apache to use mod_fcgid (NOT mod_fastcgi) to test my binary? If no online resource is available (I'd be surprised), then could someone please point out the steps required to do the testing?

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• Using socat to exec php cli

  - by RoyHB

  There are multiple client programs that periodically connect to a port on my server and send a single line of text. When a connection to the port is made I need to start a PHP CLI script that processes the data. There may be many of the remote scripts running/connecting at more or less the same time so I think it would be best if socat forked a process for each connection to run the script. I've gotten socat to do most of what I need, using the command socat tcp-l:myport,fork exec:mypath/socatTest.php I can read the input on php://stdIn. All is good. The problem is that the process doesn't seem to fork, so if a second external program sends data while another is doing the same it gets a connection refused error. Where have I gone wrong?

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• Group Policy dealing with IE zone assignment not sticking!

  - by Brandon

  I have a group policy (which ONLY deals with the zone assignment) -that is continually switching on and off with reboots. I thought it was a conflicting group policy but when I run group policy modeling report it doesn't show any descrepancies that I can see. I thought it may be an issue with one domain controller wasn't replicating my policy change to the other one, but this isn't the case. I checked both domain controllers and they show the same information. The assignment is on a user basis and is in: user configuration > administrative templates > windows components > internet explorer > internet control panel > security and is site to zone assignment.

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• OBIEE lifetime support

  - by THE

  I just received an email from the Development team explaining the detailed dates when what version of OBIEE will be in what stage of Support. So again for all readers who have not had the chance to look at the  lifetime Support policy from Oracle, I'll  try to explain this in easy words: Any major release is in "error correction support" by Development for another 12 months following the availability of a new major release. Examples: 11.1.1.5.0 was released in May 2011.  => So 11.1.1.3.0 (the version before that) went out of patching support ( or "error correction support" ) 12 months after that, i.e. June 2012. Note here: It went out of error correction support, which means Development will not fix bugs, or issue patches after that. The product can still be supported by Technical Support ( as "best effort support" ).So - Questions will still be answered, but there will not be fixes to bugs or glitches.11.1.1.6.0 was released in February 2012.  => Therefore 11.1.1.5.0 will be out of patching support / error correction support starting March 2013. I hope this clears up some of the questions/concerns that you might have had. Oh, and of course to mention the latest and recommended version to use: 11.1.1.6.0 + 11.1.1.6.5 bundle patch is "just what the doctor ordered".

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• bursty streaming video

  - by broiyan

  What is the cause and solution for the bursty streaming media problem? Example: when streaming from youtube, audio (and video) will pause and start intermittently. When it starts it will be bursty, that is, it will play several seconds of sound in just a fraction of a second. Normal sounds are rendered unrecognizable. Then it may pause and after a few seconds, resume with another burst. The video seems to burst along with the audio. This was observed on Ubuntu 12.04 with Google Chrome.

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• Bug: unable to handle kernel NULL pointer dereference at

  - by maria

  I have recently installed new system on my disc, Ubuntu 12.04. Installation proceeded without problems, I started installing additional software and put data from other discs. I had already two times bug report, it was quite long, and I have no idea how to acces to log file (which probably is somewhere saved) and since I had to switch off the computer using the button, anything else was possible, here is just a small part of it (what I've noted on paper) could not write bytes: Broken pipe speach dicpatcher disabled: edit etc/default/speach-dispatcher saned disabled: edit .... and than: BUG: unable to handle kernel NULL pointer dereference at 0000009c I've run Memory test in GRUB, everything is fine. First time it occured when I was using rsync, second time when I was trying to install texlive. Should I install whole system once again? Or can it be hardware problem? Or something else? If there is any hardware details which may be relevant, please ask, since I have no idea what is happening, I don't know what kind of information could be useful. Thanks P.S. dmesg output:

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• Git Branch Model for iOS projects with one developer

  - by glenwayguy

  I'm using git for an iOS project, and so far have the following branch model: feature_brach(usually multiple) -> development -> testing -> master Feature-branches are short-lived, just used to add a feature or bug, then merged back in to development and deleted. Development is fairly stable, but not ready for production. Testing is when we have a stable version with enough features for a new update, and we ship to beta testers. Once testing is finished, it can be moved back into development or advanced into master. The problem, however, lies in the fact that we can't instantly deploy. On iOS, it can be several weeks between the time a build is released and when it actually hits users. I always want to have a version of the code that is currently on the market in my repo, but I also have to have a place to keep the current stable code to be sent for release. So: where should I keep stable code where should I keep the code currently on the market and where should I keep the code that is in review with Apple, and will be (hopefully) put on the market soon? Also, this is a one developer team, so collaboration is not totally necessary, but preferred because there may be more members in the future.

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• Do TCP/UDP connections add to the Windows incoming connection limit?

  - by user47899

  Hi all, I've tried to figure out what Microsoft means by "Windows sockets" and it all seems very vague. Basically we have customers that sometimes try to set up workgroups with close to 10 Windows XP computers with drive and printer shares and we're worried that some of the non-Windows Ethernet devices on the network will cause issues with the inbound connection limit outlined here where only 10 inbound connections can be active at one time. For example, there is an Ethernet Caller ID device that broadcasts UDP packets to all computers, and a kitchen display system that likewise broadcasts UDP. They may also have incoming TCP packets for our custom online ordering module. Do these TCP/UDP connections count toward the inbound connection limit? I'm aware that Windows 7 has increased the limit to 20 but we might have future customers that will push that limit. Thanks in advance

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• Web Content Filtering for Windows Clients

  - by djoyce

  I'm working with a small business to solve a bunch of problems. One is their Windows 7 POS registers need to have web access restricted to only three remote support sites, but the back office machine needs an unfiltered connection. I'd like something I can install and configure on the few registers to block all but those few sites. In a perfect world this would restrict the normal register user, but the admin user would not be filtered. Free is best, if it works, but a small fee would be alright too. Microsoft's Family Safety filter is close, but requires a Windows Live account, which isn't ideal, but may be alright. Anyone use this in a small business environment? I'd prefer something easily managed at the local machines. K9 Web Protection is interesting and I'm going to look into it more. Are there other options? Seems like someone would have made something simple like this as an open source project, but maybe not.

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• Visual Studio 2013 now available!

  - by TATWORTH

  Originally posted on: http://geekswithblogs.net/TATWORTH/archive/2013/10/17/visual-studio-2013-now-available.aspxVisual Studio 2013 is now available for download! I will attach the beginning of their web page announcement. You should note that web projects may now be readily a combination of Web Forms, MVC and Web API.We are excited to announce that Visual Studio 2013 is now available to you as an MSDN subscriber! For developers and development teams, Visual Studio 2013 easily delivers applications across all Microsoft devices, cloud, desktop, server and game console platforms by providing a consistent development experience, hybrid collaboration options, and state-of-the-art tools, services, and resources. Below are just a few of the highlights in this release:   •   Innovative features for greater developer productivity:Visual Studio 2013 includes many user interface improvements; there are more than 400 modified icons with greater differentiation and increased use of color, a redesigned Start page, and other design changes.  •   Support for Windows 8.1 app development: Visual Studio 2013 provides the ideal toolset for building modern applications that leverage the next wave in Windows platform innovation (Windows 8.1), while supporting devices and services across all Microsoft platforms. Support for Windows Store app development in Windows 8.1 includes updates to the tools, controls and templates, new Coded UI test support for XAML apps, UI Responsiveness Analyzer and Energy Consumption profiler for XAML & HTML apps, enhanced memory profiling tools for HTML apps, and improved integration with the Windows Store.  •   Web development advances: Creating websites or services on the Microsoft platform provides you with many options, including ASP.NET WebForms, ASP.NET MVC, WCF or Web API services, and more. Previously, working with each of these approaches meant working with separate project types and tooling isolated to that project’s capabilities. The One ASP.NET vision unifies your web project experience in Visual Studio 2013 so that you can create ASP.NET web applications using your preference of ASP.NET component frameworks in a single project. Now you can mix and match the right tools for the job within your web projects, giving you increased flexibility and productivity.

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• How many hours of use before I need to clean a tape drive?

  - by codeape

  I do backups to a HP Ultrium 2 tape drive (HP StorageWorks Ultrium 448). The drive has a 'Clean' LED that supposedly will light up or blink when the drive needs to be cleaned. The drive has been in use since october 2005, and still the 'Clean' light has never been lit. The drive statistics are: Total hours in use: 1603 Total bytes written: 19.7 TB Total bytes read: 19.3 TB My question is: How many hours of use can I expect before I need to clean the drive? Edit: I have not encountered any errors using the drive. I do restore tests every two months, and every backup is verified. Edit 2: The user manual says: "HP StorageWorks Ultrium tape drives do not require regular cleaning. An Ultrium universal cleaning cartridge should only be used when the orange Clean LED is flashing." Update: It is now May 2010 (4.5 years of use), and the LED is still off, I have not cleaned, backups verify and regular restore tests are done.

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