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• two scp and ssh processes with single authentication

  - by Tomek Wyderka

  I need to scp and then ssh to the same host. Is it possible to authenticate just one time? Is it possible to input password once, then scp file, then ssh on that host and work interactively? Update I get HOSTNAME and SSH_PASSWORD. I never log in on that machine before. I need to send some files (probably using scp) and then log in using ssh and work on that HOST interactively. I want to save time and input password just once. I have lots of such hosts...

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• Problem with caching images on server- jQuery

  - by klon

  Hi I have the weirdest problem. I am implementing a simple gallery with a use of nivo slider jQuery plugin. Everything works perfectly when I test it on my local machine, however I am having an issue on an online hosted server. The images do not tend to appear when you first open the website. There seems to be an issue with caching the images. when you reload the page (simple f5) everything works fine. Rather than showing you the code, I think it would be better to show the site so you can see what firebug shows you: http://teslacreations.com/orangery/test.php Does anyone have any ideas how to solve it?

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• Faking a Single Address Space

  - by dsimcha

  I have a large scientific computing task that parallelizes very well with SMP, but at too fine grained a level to be easily parallelized via explicit message passing. I'd like to parallelize it across address spaces and physical machines. Is it feasible to create a scheduler that would parallelize already multithreaded code across multiple physical computers under the following conditions: The code is already multithreaded and can scale pretty well on SMP configurations. The fact that not all of the threads are running in the same address space or on the same physical machine must be transparent to the program, even if this comes at a significant performance penalty in some use cases. You may assume that all of the physical machines involved are running operating systems and CPU architectures that are binary compatible. Things like locks and atomic operations may be slow (having network latency to deal with and all) but must "just work".

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• How can I send an std::vector<std::string> over a UNIX socket?

  - by Mike

  For my application, I need to be able to send an std::vector<std::string> over a UNIX socket(local), and get a copy of the vector on the other end of the socket. What's the easiest way to do this with O(1) messages relative to the size of the vector(i.e. without sending a message for each string in the vector)? Since this is all on the same host, and because I control both ends of the socket, I'm not concerned with machine-specific issues such as endinness or vector/string representation.

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• Capture IP packets on Dialup connection - Windows 7

  - by Assaf Levy

  Our product utilizes (the wonderful) Winpcap to capture ip packets from all devices with an IP address and analyze them in real time. Unfortunately, we discovered that it does NOT capture any packets on dialup (e.g. PPP) connections on Windows 7, and that there are no near-term plans for enabling this (1). So we need something else. Microsoft Network Monitor and Windows Packet Filter are two options that surfaced during a bit of googling, but before delving into research I wanted to ask the experienced: what are out options, given the following requirements: Capture all in/outbound IP packets on the machine. Complete background processing - no UI should be involved. Support Windows Vista / 7. Performance (user should not feel the difference). Thanks in advance.

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• MySQL Accept Any Password

  - by George

  Suppose that I have a test server with a large group of test accounts. The test accounts have unknown passwords which are hard-coded into the application's reports and are stored encrypted in the mysql.users table. Is there any option or hack which can be used to make mysql accept any text as the "correct" password for an account? For example: Update mysql.user Set Password="*" where 1=1 Note: The above line wouldn't work because it would literally set the password to "*" and not the wildcard character. However, I am looking for a way to create a mysql account which would accept anything as a valid password. This machine is disconnected from the network and I have full access to the mysql database...

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• Installing Qt libraries on OS X

  - by AXL79

  I'm trying to install the Qt 4.8.3 precompiled libraries downloaded from http://qt-project.org/downloads on my OS X 10.6 machine. Unfortunately the package doesn't seem to actually install any libraries (although it claims to do so in the readme) I've read loads of instructions of how to configure and build Qt from source but these are precompiled, as in 'you don't have to compile them yourself'. So I must be missing something. Is there anyone out there who knows how to actually install Qt on OS X so that it is possible to link against them -without- building the whole thing from source. Thanks

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• Commiting broken code to the repository for the purpose of backing it up

  - by Tim Merrifield

  I was just talking to another developer (more senior than I) and trying to convince him that we should implement continuous integration via Cruise Control. He told me that this will not work because he commits code that does not compile to the repository all the time for the purposes of backing it up. And that automated builds notifying us of failures would be just noise. Committing garbage to the repo sounds bad to me. But I was at a loss of words and didn't know what to say. What is the alternative? What's the best practice for backing up your code on another machine without adding a bunch of pointless revisions? BTW, our version control system is SVN and that probably won't change any time soon.

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• error 1202 - ERROR_DEVICE_ALREADY_REMEMBERED in WNetAddConnection2A

  - by Don

  I used the function - WNetAddConnection2A(n, UserName, Password, dwFlags) to programmatically map a drive and read the drive info out, and then used WNetCancelConnection2A(DriveLetter, dwFlags, ForceDisconnect) to unmap the drive. The first map and unmap were fine. But the next map will bring me the error 1202 - ERROR_DEVICE_ALREADY_REMEMBERED when the same driver letter is used. I set dwFlags = 0. It works in my development machine but fails in server. How to eliminate the error 1202? Thanks!

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• best place to store .net assemblies

  - by stackoverflow

  To give a scenario, let us simply assume an engine that loads plug-ins and exposes features in the plug-in. User 1 uploads a plug-in which allows implements Act 1 User 2 uploads a plug-in which allows implements Act 2 A plug-in in this case is .net assembly. Now in this scenario, if we have to store all the assemblies - what would be the best place? Also, the plug-in would require to be versioned so execution can happen of a particular version. Further considering the plug-in engine is installed on multiple machines or on same machine as different instances (similar to sql server). Would a centralized database (sql server 2005) with a table to store all the assembly be a good idea (centralized backup etc.,) (assembly size would be around 500kb to 1MB)

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• who uses a TCP port?

  - by dijxtra

  One of gen_servers in my app call gen_tcp:listen(Port, [{active, true}]). First time I run unit test, it returns {ok, Socket}, but second time I run the same unit test, it returns an {error, eaddrinuse}, but lsof -i TCP returns nothing. Also, when the same unit_test is run twice on another machine (WinXP), it works as expected (that is, returns {ok, Socket} both times). Therefore, my gen_server obviously releases the port, but Erlang somehow doesn't know that. So, how can I figure out who does Erlang think uses this address?

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• Visualizing branch topology in git

  - by Benjol

  I'm playing with git in isolation on my own machine, and even like that I find it difficult to maintain a mental model of all my branches and commits. I know I can do a git log to see the commit history from where I am, but is there a way to see the entire branch topography, something like these ascii maps that seem to be used everywhere for explaining branches? .-A---M---N---O---P / / / / / I B C D E \ / / / / `-------------' It just feels like someone coming along and trying to pick up my repository would have difficulty working out exactly what was going on. I guess I'm influenced by AccuRev's stream browser...

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• SVN : how to change hostname?

  - by elon

  I'd like to sep up SVN repo on local machine. But we already have apache running under localhost. When I use instalator form subversion site with apache option it installs another apache and when I type "localhost" in browser I see this new apache (not the old one). Question is how to run this new apache under other host name. When installing it asks about it, so I set different name, but it still works under localhost (nothing happens). I'd like to have access to svn via URL e.g. "svnrepo" not "localhost". What can I do about it? Which lines of config should be changed (and/or what's more should be changed?) Another way I'm thinking of to solve this problem is to integrate this svn-apache module with mine apache. But still I don't really know how to do it (my apache is 2.2.6)

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• C# similar technologies and books in Java

  - by MigNix

  Hi, I know this can look like dublicate of other discussions and I have already reviewed them, but they are different. I want to learn Java and I want to know are there any books similar to those that I have seen for C#. Here is the list: C# 4.0 in a Nutshell: The Definitive Reference Probably Java in a Nutshell :) Professional C# 4.0 and .NET 4 Pro C# 2010 and the .NET 4 Platform Accelerated C# 2010 Programming WCF Services Essential Windows Communication Foundation (WCF): For .NET Framework 3.5 C# in Depth: What you need to master C# 2 and 3 CLR via C# Professional ADO.NET 3.5 with LINQ and the Entity Framework Professional Enterprise .NET Framework Design Guidelines: Conventions, Idioms, and Patterns for Reusable .NET Libraries Mainly I am interested in Java 6 and want to know about JVM , Cuncurency, Data access and distributed application technologies. I have seen there are some books on JVM like Inside the Java 2 Virtual Machine also some free books on official web site. Also I found concurrent programming in Java. But may be you can suggest any others. Thank you

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• Microsoft Access DB Connection

  - by sikas

  I have a Microsoft Access DB (2003) that I want to connect to it using C# .. The problem I'm facing is I don't have Access installed within the office package .. So I was wondering if it is possible to connect to it as a database to retrieve and update the tables .. Thanks. UPDATE I have received the error below: Error Detected: System.InvalidOperationException: The 'Microsoft.Jet.OLEDB.4.0' provider is not registered on the local machine. at System.Data.OleDb.OleDbServicesWrapper.GetDataSource(OleDbConnectionString constr, DataSourceWrapper& datasrcWrapp er) at System.Data.OleDb.OleDbConnectionInternal..ctor(OleDbConnectionString constr, OleDbConnection connection) at System.Data.OleDb.OleDbConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInf o, DbConnectionPool pool, DbConnection owningObject) at System.Data.ProviderBase.DbConnectionFactory.CreateNonPooledConnection(DbConnection owningConnection, DbConnection PoolGroup poolGroup) at System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory conne ctionFactory) at System.Data.OleDb.OleDbConnection.Open() at SampleNamespace.SampleClass.Main()

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• Why doesn't a 32bit .deb package install on 64bit Ubuntu?

  - by codebox_rob

  My .deb package, built on 32-bit Ubuntu and containing executables compiled with gcc, won't install on the 64-bit version of the OS (the error message says 'Wrong architecture i386'). This is confusing to me because I thought that in general 32-bit software worked on 64-bit hardware, but not vice-versa. Will it be possible for me to produce a .deb file that I can install on a 64-bit OS, using my 32-bit machine? Is it just a matter of using the appropriate compiler flags to produce the executables (and if so what are they), or is the .deb file itself somehow specific to one processor architecture?

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• Httpd Process High memory usage and slow page loads

  - by Abs

  Hello all, I am running wampserver on my windows vista machine. I have been doing this for a long time and it has been working great. I have completed loads of projects with this setup. However, today, without me changing anything (no configuration etc) only PHP code changes, I find that every time I load pages of my site (those with user sessions or access the database) are really slow to load - Over 30 seconds, they use to take 1 or 2 seconds. When I have a look at the task manager, I can see on page loads the httpd process jumps from 10mb to 30mb, 90mb, 120mb, 250mb and then back down again. I have tested previous php code projects and they seem to all be slow as well! What is going on? Thanks all for any help on this confusion issue!

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• Asp.net profile in a separate assembly

  - by Shimrod

  Hi everyone, I have a web application which uses membership and profiles. I successfully used the WebProfileBuilder extension, so my profile class is correctly generated, and is working nicely. However, after a new request of my client, I need now to move that profile management part into another assembly (so I'd be able to get profile information in a windows service running on the same machine). What I made is created the new assembly, moved my generated profile file, and tried to use it from the other assembly, but without any success. I always get a SettingsPropertyNotFoundException. My tought is that the profile system doesn't know where to find its connection information, so I tried to add the connectionstring and provider in the app.config of this assembly, but this doesn't seem to work. What am I missing ? Is it possible to do ? Thanks in advance!

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• Simple cdd (custom debian distribution) problem

  - by Daniel G. R.

  Hi everyone, Im trying to make my own debian distribution but I have a problem. simple-cdd works fine but when I try to install my generated .iso, everything goes right since a message apears: " No installable kernel was found in the defined APT sources You may try to continue without a kernel. and manually install your kernel later. This is only recommended for experts, otheriwse you will likely end with a machine that dosent boot. COntinue Without installing a kernel? " And if y say yes, it continues... When is time to install grub it says: " Installation step failed An installation step failed. You can try to run the failing item again from the menu, or skip it and choose something else. The failing step is: Install the GRUB boot loader on a hard disk " HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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• Deploying Rails app over VPN

  - by DavidGouge

  You'll have to bear with me as I'm not a Ruby dev, but have inherited a Ruby system. I need to deploy some changes to the app from my repository to the server. I've been instructed to run cap deploy and told that that script will get the latest code from my repository and deploy it to the server. My problem is that I have to VPN to get to the production server and the VPN client then blocks access to my local network, cutting off the repository. So my question is, how can I change my deploy.rb so that I can deploy from my local machine instead? Or is there a better way. If you need to see the deploy.rb, please let me know. Thanks Dave

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• How to create thumbnail images from DOC/RTF/PDF/XLS files

  - by imdadhusen

  I need to ask if any of you has any knowledge of creating file thumbnails on the fly. I have found a free component but it works only for PDF files, PDFThumbnailer. But my requirement is to convert DOC/RTF/PDF/XLS files to thumbnails on the fly, and if possible allow to save it as an image for later reference which currently PDFThumbnailer doesnt allow. PDFThumbnailer takes the pdf file and renders an image for it on browser, if that image can also be saved somehow to my machine that would be great too. Please guide me of how to achieve the above requirements. Any help for any filetype is appreciated. Thanks Imdadhusen

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• Network license control for a Java application

  - by user1461615

  I have been tasked with providing some form of network license control for a Java application. The app would be stored on a network drive and run from a client machine. The basic idea is that it will be able to work out how many times it is being run concurrently and prevent the N+1th user from running the software where N is the number of concurrent licenses the customer has purchased. Is this possible somehow with a Java application? I implemented a "solution" which relied on multi-cast UDP communication between the running instances of the application but this didn't work because on most networks this kind of communication is blocked by security measures. Is there a better way? I don't even mind if it requires JNI/JNA. N.B. The solution does not have to be that sophisticated or highly secure.

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• Can Visual Studio exclude certain folders when searching for header files?

  - by identitycrisisuk

  I'm having trouble with a library that we are using, which has two copies of header files that are needed - one which we are modifying and building from and another which is automatically created during the build process. I don't fully know why or really want to change this but it can cause a bit of annoyance when on random occasions the go to definition function takes you to the auto created header instead of the one used to build. Usually you can spot it but sometimes you don't and make changes to the auto created one, which are then overwritten or sometimes stay around for a while so that something works on your machine but breaks on other peoples. I don't know if there is any way around this as the auto created folder is in the additional include directories of some of the projects in the solution but I just thought I would ask if there was any good way of reducing the chance of this annoying situation cropping up.

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• Table naming convention?

  - by MattSlay

  In our manufacturing shop, each Employee hits the time clock every time they change Jobs or Machines (work centers) during their work day. Each record created in the Time Clock app has foreign keys that link the record to: the Employee, the Job, and the Machine which they are about to operate. I’m trying to determine the best name for this table… If I were tempted to call it ClockRecords or TimeClockRecords, why wouldn’t I also consider naming it JobTimeRecords, or why not MachineTimeRecords. Any ideas on a good name?

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• C# Client-Server implementation error on client's socket

  - by Ksice

  I'm trying to launch my client. Server already runned on the same computer. So I'm using "localhost" with GetHostEntry: IPHostEntry ipHostInfo = System.Net.Dns.GetHostEntry("localhost"); IPAddress ipAddress = ipHostInfo.AddressList[0]; IPEndPoint remoteEP = new IPEndPoint(ipAddress, Port); But I have this "no connection could be made because the target machine actively refused it" error. What is the reason? Could it be because ipHostInfo.AddressList[0] is an IPv6? How then I can accept Ipv4 address?

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