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• How to get the line non-empty of a file using tail ? Bash

  - by debugger

  Do you have an idea how to get the last line non-empty using tail in bash ? For example my_file.txt will be as following: hello hola bonjour (empty line) (empty line) Obviously if i do tail -n 1 my_file.txt i will get an empty line. In my case i want to get bonjour Any clues? Thanks Debugger

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• Get ahold of session in command object in Grails

  - by UltraVi01

  How can I get the session from within a command object? I have tried: import org.springframework.security.context.SecurityContextHolder as SCH class MyCommand { def session = RCH.currentRequestAttributes().getSession() } This throws java.lang.IllegalStateException: No thread-bound request found: Are you referring to request attributes outside of an actual web request, or processing a request outside of the originally receiving thread? If you are actually operating within a web request and still receive this message, your code is probably running outside of DispatcherServlet/DispatcherPortlet: In this case, use RequestContextListener or RequestContextFilter to expose the current request.

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• Using a user-defined type as a primary key

  - by Chris Kaminski

  Suppose I have a system where I have metadata such as: table: ====== key name address ... Then suppose I have a user-defined type described as so: datasource datasource-key A) are there systems where it's possible to have keys based on user-defined types? B) if so, how do you decompose the keys into a form suitable for querying? C) is this a case where I'm just better off with a composite primary key?

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• log4net - getting appenders specific to only one logger

  - by andreav

  I'm looking for a way to get all appenders attached to one logger instance. I tried: Hierarchy hierarchy = LogManager.GetRepository() as Hierarchy; hierarchy.GetAppenders() as per documentation this returns all appenders for all loggers currently configured. When I try this: LogManager.GetLogger("MyLoggerName").Logger.Repository.GetAppenders(); I get the same result. I would like to retrieve only appenders attached to one logger ("MyLoggerName" in this case) Were am i wrong? Thank you.

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• Which version(s) of WiX integrate with Visual Studio 2010?

  - by Graham Clark

  The documentation on the various WiX sites (Sourceforge or Codeplex) is a little unclear. Is it the case that only version 3.5 (still in beta) of WiX will integrate with Visual Studio 2010 (i.e. allow me to add and edit a WiX project in a solution)?

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• initialize a const array in a class initializer in C++

  - by Nathan Fellman

  I have the following class in C++: class a { const int b[2]; // other stuff follows // and here's the constructor a(void); } The question is, how do I initialize b in the initialization list, given that I can't initialize it inside the body of the function of the constructor, because b is const? This doesn't work: a::a(void) : b([2,3]) { // other initialization stuff } Edit: The case in point is when I can have different values for b for different instances, but the values are known to be constant for the lifetime of the instance.

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• How to test Gem Extensions in Rails

  - by rube_noob

  I have written an extension to an existing gem (that is stored in lib) and a corresponding test for my extension. How could I go about running the gem's tests as well as my own automatically. What is the best practice for this case?

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• Cannot redirect after HTTP headers have been sent.

  - by Anilkumar

  When I try to redirect to another page through Response.Redirect(URL) am getting the following error:- System.Web.HttpException: Cannot redirect after HTTP headers have been sent. I wrote one Response.Write("Sometext"); and Response.Flush() before calling redirect Method. In this case how do we use Response.Redirect(URL)?

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• How to pass parameters in when call code-behind function in javascript?

  - by KentZhou

  Suppose I have a function in code behind like: Public Function Calc(ByVal ID As Integer) As Boolean '...... End Function I can call this function in javascript like var isSuccess ='<%=Calc()%>'; but how to pass the parameter in for this case? Following code not working: var ID = 1; var isSuccess ='<%=Calc(ID)%>';

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• Zend Framework, what $this->_forward is doing

  - by RageZ

  Hello everyone, I would like someone to explain me what _forward is exactly doing, I cannot see if _forward is also rendering the attached view to the action or just executing the action. Also is it possible to pass argument to $this-action in a view script ? More generally my problem is how to code a confirmation page, let's say the user input some stuff and you want to show him confirmation, is forward is mean for that case ? Thanks

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• Bind to Count of items in the DataContext

  - by Organ Grinding Monkey

  I want to bind to the Count/amount of items within my DataContext. I have an object, lets say person which has a List<address> as a property. I would like to display the amount of addresses for that person ie: 5 or 6 or whatever the case may be. I've tried {Binding Path=address#.Count} and a few others but that doesnt seem to work. Any help would be appreciated, thanks.

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• Sharing serial port (Modem protocol + dialer)

  - by debita

  Hi, I wanted to use this code to send archives with Xmodem: http://www.java2s.com/Code/Java/Network-Protocol/JModemsimplecommunicationsprogram.htm In this case, I want to establish a dialup connection between two computers and send a binary file. But this code doesn't let me set a phone number to dial after i setup the port and before I transfer the file. Is there any way of sharing the port with another application that dials the phone number?

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• install avisynth under linux via ssh

  - by Issak

  i have a linux server (ubuntu os) to which i have access via ssh and wish to install avisynth on it. i know windows apps can be installed with the help of wine, but the problem is how i manage to install the app (avisynth) thru ssh, that is, without graphical intarface? can wine be somehow configured to manage such a case? what should i do to install avisynth via ssh? (am not insterested in other apps)

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• Android imageButton reset

  - by Dorin Rusu

  I have an app in which I need to use ImageButtons.The app has tabs, and when I click on a tab the ImageButton should be calling setBackgroundResource(), and when I click on another tab the imageButton should call setBackgroundColor() instead. The problem is that once the resource has been set (in my case a shape with round corners, a stroke and a transparent background), any use of setBackgroundColor() will just recolor the shape, and not the whole button. Is there a way to reset/clear the resource of an ImageButton?

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• Sun's JVM instruction speed table

  - by Pindatjuh

  Is there a benchmark available how much relative time each instruction costs in a single-thread, average-case scenario (either with or without JIT compiler), for the JVM (any version) by Sun? If there is not a benchmark already available, how can I get this information? E.g.: TIME iload_1 1 iadd 12 getfield 40 etc. Where getfield is equivalent to 40 iload_1 instructions.

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• QuickGraph - How can I associate an Edge with a Class? (i.e. like you can with a Vertex)

  - by Greg

  Hi, Q1 - How can I associate an Edge with a Class? (i.e. like you can with a Vertex) In my case there are various types of edges I want to be able to model. So my real question I guess is how can I associate some level of data with Edges (e.g. edge type). The graph I was looking at using was: http://quickgraph.codeplex.com/wikipage?title=BidirectionalGraph&referringTitle=Documentation thanks

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• Taking backup of data in a table.

  - by Rishabh Ohri

  Hi All, Is there some way to backup the data in a table in sql server by using sql scripts. Note: I dont want to take the backup of the whole database. And later on restore the same data back in case of any failure. Please suggest some solution.

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• JQuery addclass to another div (but not parent) if no data is found

  - by Danny

  I have this to add a class to the main table that the report is in if there is no data returned. $('#report-area table td:contains("Sorry, your search did not return any data")').parents('#reportArea').addClass('no-report-data') However, I have another div area "#report-footer" but it's not inside #report-area. I'd like to also add the .no-report-data class to "#report-footer" as well but in this case I don't think the .parents selector will work. Is there another selector I can use to do this?

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• How could I pass the float number by value in obj-c?

  - by user313439

  - (void)applicationDidFinishLaunching:(UIApplication *)application{ // Override point for customization after application launch [window makeKeyAndVisible]; [self printFloat:1.3f]; } - (void)printFloat:(float)f { NSLog(@"%f",f); } I passed the "1.3f" to printFloat, but it was the wrong value (in this case, -2.000000) after "f" received. And there is a warning that "AppDelegate may not respond to -printFloat:" Where did I get it wrong? Thanks.

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• Adding a view with a view controller as a subview of another view controller. Doesn't work.

  - by Tom

  I'm trying to essentially re-implement the UISplitViewController (because it has its limits), but when I create a UIViewController viewController, and then do an "[viewController.view addSubview contentViewController.view]" on it, to add a view that already has a view controller, that content view doesn't seem to get initialised by its view controller. I guess its view controller is getting detached or deallocated, is this the case?

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• appendBezierPathWithGlyph fails in [NSBezierPath currentPoint]

  - by anton-schwitzgäbele

  Has anybody an idea in which case this can happen? GDB output: 0 .. 8: kill, abort, objc_exception_throw etc. 9: 0x00007fff87ea21f4 in +[NSException raise:format:] () 10: 0x00007fff8694e9e2 in -[NSBezierPath currentPoint] () 11: 0x00007fff869e3b3b in __NSAppendBezierPathWithGlyphs () 12: 0x00007fff869e5baf in -[NSBezierPath appendBezierPathWithGlyphs:count:inFont:]() 13: 0x00007fff869e2e2d in -[NSBezierPath appendBezierPathWithGlyph:inFont:] ()

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• Reports Generation for Web Based Application Using Selenium Tool

  - by Rahul Mendiratta

  Currently we are generating HTML Reports for Automation, but those reports are not good enough to explain number of scenario which we cover in Automation, Is there anything we can use with Selenium to generate a proper reports which can give a complete overview and can easily understand by anyone First Thing we can show a complete pie charts which cover number of test case passed and Failed. Second thing we can show, what are test cases are there in this build.

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• Is there thing like pass by value pass by reference in JavaScript ?

  - by Anil Namde

  When i started learning function in C++ its all around pass by value and reference. Is there something similar we have in javascript ? If yes/not how it works in case of javascript? Thanks all.

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• Python matching some characters into a string

  - by roaksoax

  Hi All I'm trying to extract/match data from a string using regular expression but I don't seem to get it. I wan't to extract the highlighted characters from the following string: /xubuntu/daily/current/lucid-alternate-**i386**.iso This should also work in case of: /xubuntu/daily/current/lucid-alternate-**amd64**.iso Thanks a lot for your help.

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• What are real world examples of when Linked Lists should be used?

  - by oo

  Another programmer was mentioning that they haven't found a use case for using a linked list data structure in any professional software in his career. I couldn't think of any good examples off the top of my head. He is mostly a C# and Java developer Can anyone give some examples where this was the correct data structure to solve a particular real world problem? Related: What is a practical, real world example of the Linked List?

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