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How do I remove a single file from the staging area (undo git add)?

Situation: I have a Git repository with files already in the index. I make changes to several files, open Git and add these files to my staging area with "git add ." ...
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C++11 std::threads vs posix threads

Why should I prefer one or another in practice? What are technical differences except that std::thread is a class? 4 Answ...
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How can I convert a DateTime to the number of seconds since 1970?

I'm trying to convert a C# DateTime variable to Unix time, ie, the number of seconds since Jan 1st, 1970. It looks like a DateTime is actually implemented as the number of 'ticks' since Jan 1st, 0001. ...
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Apply .gitignore on an existing repository already tracking large number of files

I have an existing Visual Studio project in my repository. I recently added a .gitignore file under my project and I assume that tells Git to ignore the files listed in the file. ...
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How to add jQuery in JS file

I have some code specific to sorting tables. Since the code is common in most pages I want to make a JS file which will have the code and all the pages using it can reference it from there. ...
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How to remove line breaks from a file in Java?

How can I replace all line breaks from a string in Java in such a way that will work on Windows and Linux (ie no OS specific problems of carriage return/line feed/new line etc.)? ...
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How can I count all the lines of code in a directory recursively?

We've got a PHP application and want to count all the lines of code under a specific directory and its subdirectories. We don't need to ignore comments, as we're just trying to get a rough idea. ...
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How to get folder path for ClickOnce application

I need to write a file in the same folder where a console ClickOnce .application (executable file) resides. The folder where it launches from. ...
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What character to use to put an item at the end of an alphabetic list?

I often prepend ' _ ' to the item I want in first position. Is there some sort of magical character I could use to put an item at the end of the list? ...
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Easiest way to rename a model using Django/South?

I've been hunting for an answer to this on South's site, Google, and SO, but couldn't find a simple way to do this. 4 Answ...