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• commands executing in piping in UNIX

  - by Happy Mittal

  when I write a command $ echo date then it prints "date" as it is i.e it doesn't run date program. But when I write $ echo date | wc then correct answer is produced as if date was run. How piping is making difference here ? Please explain.

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• Emacs bulk indent for Python

  - by Vernon

  Working with Python in Emacs if I want to add a try/catch to a block of code, I often find that I am having to indent the whole block, line by line. In Emacs, how do you indent the whole block at once. I am not an experienced Emacs user, but just find it is the best tool for working through ssh. I am using Emacs on the command line(Ubuntu), not as a gui, if that makes any difference.

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• Creating instance in java class

  - by aladine

  Please advise me the difference between two ways of declaration of java constructor public class A{ private static A instance = new A(); public static A getInstance() { return instance; } public static void main(String[] args) { A a= A.getInstance(); } } AND public class B{ public B(){}; public static void main(String[] args) { B b= new B(); } } Thanks

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• Dynamically resizing CFWINDOW to fit content

  - by Ryan French

  Hi all, Am currently working on a site that uses a lot of cfwindow objects and I was wondering if anyone knows of a way to dynamically resize the window so that all the content fits in without the need for scroll bars. I have tried using the overflow=visible configuration but it doesnt seem to make a difference. Thanks in advance for any advice.

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• Webmethod not working when webservice published on other server - same data gives "Object Reference

  - by SteveMc

  Could it be a difference in .Net setup on server? Both have .Net 3.5 SP1 I can see both webmethods when I use url with .asmx name.

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• Zend_Search_Lucene vs SOLR

  - by spacemonkey

  Hi, I have recenlty stumbled into Zend Lucene port of Lucene project. I have a little bit experience with SOLR so I would like to know what is the difference between two of them especially from performance and installation side. As much as I know SOLR requires Tomcat serverlet running in web hosting in order to work, what about Zend Lucene library? I am also a bit confused what means "being implemented on the top of Lucene"?

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• sizeof float (3.0) vs (3.0f)

  - by kumar

  Hi, What is the difference between sizeof(3.0) and sizeof(3.0f) I was expecting both of them to give the same result (sizeof float)..but its different. In 32 bit machine,gcc compiler, sizeof(3.0f) =4 sizeof(3.0) = 8 Why so?

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• Update one list from another

  - by lacqui

  I have two multi-select lists in HTML - one of categories, and another of items. What I want is that, when an item selected in the "category" list, everything in the "items" list from that category is also selected. For example, if "Categories" contains "Animal", "Mineral", and "Vegetable", and "Items" contains "Dog", "Cat", "Monkey", "Diamond", "Granite", "Carrot", "Tomato": If "Animal" is selected in one list, "Dog", "Cat", and "Monkey" should be selected; any other selections should remain as they are. I'm using a Symfony PHP backend on the server, if that makes any difference

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• What is the most impressive performance optimisation you have seen?

  - by mikera

  Yes, we all know that we shouldn't prematurely optimise. But sometimes it does make all the difference, and sometimes the improvements you can get are amazing. What have you seen that we can all admire and learn from?

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• differences between socket and port in database context

  - by Yang

  hi guys, when i am using 'localhost' as the host for mysql database, sequel pro alert me that i will be using socket, if i am using '127.0.0.1', i am actually using the ip address and port 3306 to locate the server. is there any difference?

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• Question about references in java

  - by kuang

  I want to know what the difference between : String s = "text"; and : String s = new String("text");

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• How do I get CPU Clock Speed in C++ (Linux)?

  - by naspinski

  How can I get the CPU clock speed in C++? I am running Ubuntu 9.10 if that makes any difference.

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• Is "self" necessary?

  - by Rob

  Is using "self" ever necessary in Objective-C or maybe just a good practice? I have gone from using it all the time to not using it at all and I don't seem to really notice any difference. Isn't it just implied anyway?

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• C# Lambda expression syntax: are brackets necessary?

  - by DevNovice

  I'm new in C# and earlier I saw the lambda expression is like (params) => { expression;} but in LINQ, I saw examples like IEnumerable<string> customerFirstNames = customers.Select(cust => cust.FirstName); No brackets. Are they the same or is there any difference? Thanks a lot.

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• Swiz Framework and Spring Framework - Are they related?

  - by theband

  I was looking into Swiz framework and i felt the same of Spring. Just i felt the difference between these two is one is JAVA based and the other is Action Script based. http://swizframework.org/ http://www.springsource.org/ My Question is: Does the goal of the both framework is same? Does the pattern they apply is same or different? The concept of beans, dependency injection and IOC lies in both.

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• Java: "implements Runnable" vs. "extends Thread"

  - by goosefraba19

  From what time I've spent with threads in Java, I've found these two ways to write threads. public class ThreadA implements Runnable { public void run() { //Code } } //with a "new Thread(threadA).start()" call public class ThreadB extends Thread { public ThreadB() { super("ThreadB"); } public void run() { //Code } } //with a "threadB.start()" call Is there any significant difference in these two blocks of code?

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• Python `if x is not None` or `if not x is None`?

  - by orokusaki

  I've always thought of the if not x is None version to be more clear, but Google's style guide implies (based on this excerpt) that they use if x is not None. Is there any minor performance difference (I'm assuming not), and is there any case where one really doesn't fit (making the other a clear winner for my convention)?* *I'm referring to any singleton, rather than just None. ...to compare singletons like None. Use is or is not.

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• Differnce between scorm 2004 2nd and 3rd edition

  - by Lakshmi

  I am in need of a detailed difference between scorm 2004 2nd and 3rd. Can anybody point me to some good references?

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• string or nsstring with string

  - by joels

  Lets assume myProp is @property (retain) NSString * myProp and synthesized for us.... self.myProp = @"some value";//string literal? self.myProp = [NSString stringWithString:@"some value"]; Is there a difference here? Is the first one a string literal that doesnt get autoreleased or is it just in memory for it's current scope and I dont have to worry about it?

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• Why is ++i considered an l-value, but i++ is not?

  - by yesraaj

  Why is ++i is l-value? and i++ not Initially there were 2 questions one was removed since that was exact duplicate. So don't down vote the answers that were answering difference between pre- and post-increment.

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• Arithmetic + and Bitwise OR

  - by Mohanavel

  Is there any difference between Arithmetic + and bitwise OR. For the below operation i used arithmetic operation, my friend told that this is wrong. In what way this is differing. uint a = 10; uint b = 20; uint arithmeticresult = a + b; uint bitwiseOR = a | b; Both the results are 30.

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• How to stop Powershell insisting on one dash in parameters?

  - by Julian Birch

  It seems that somebody has subtly changed the way that parameter switches are parsed on powershell. On some machines "split-path c:\x\y --parent" works. On some it fails. Can anyone tell me a) what causes the difference and b) how can I stop it?

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• SQL CE, SQLite. What are the differences between them?

  - by acidzombie24

  What is the difference between SQL CE and SQLite? In what situation would i choose one over the other?

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• Question on different ways to link tables

  - by dotnetdev

  What is the difference between linking two tables and then the PK is an FK in the other table, but the FK has not got the primary key option (so it does not have the gold key), and having the PK in one table as a PK in another table? Am I right to think that the second option is for a many-to-many relationship? Thanks

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• C# Lambda expression syntax, is brackets necessary?

  - by DevNovice

  I'm new in C# and earlier I saw the lambda expression is like (params) = { expression;} but in LINQ, I saw examples like IEnumerable customerFirstNames = customers.Select(cust = cust.FirstName); No brackets. Are they the same or is there any difference? Thanks a lot.

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