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How to duplicate a whole line in Vim?

How do I duplicate a whole line in Vim in a similar way to Ctrl + D in IntelliJ IDEA/ Resharper or Ctrl + Alt + ↑ / ↓ in Eclipse ? ...
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How to determine if an NSDate is today?

...date components directly, if you get into a situation where you need to offset one of the components, you may get something like month == 3, day == 34. Converting to dates will correctly interpret this as April 3, comparing date components will not see this as the same as month == 4, day == 3. ...
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Delete empty lines using sed

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Internet Explorer 9 not rendering table cells properly

My website has always run smoothly with IE8, IE7, FF, Chrome and Safari. Now I'm testing it on IE9 and I'm experiencing a strange problem: in some pages, some tabular data renders incorrectly. ...
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T-SQL query to show table definition?

What is a query that will show me the full definition, including indexes and keys for a SQL Server table? I want a pure query - and know that SQL Studio can give this to me, but I am often on "wild" computers that have only the most bare-bones apps and I have no rights to install studio. But SQLCM...
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How to compare versions in Ruby?

How to write a piece of code to compare some versions strings and get the newest? 8 Answers ...
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What is a database transaction?

Can someone provide a straightforward (but not simpler than possible) explanation of a transaction as applied to computing (even if copied from Wikipedia)? ...
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Google Maps: Auto close open InfoWindows?

On my site , I'm using Google Maps API v3 to place house markers on the map. 12 Answers ...
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DateTime to javascript date

From another answer on Stackoverflow is a conversion from Javascript date to .net DateTime: 10 Answers ...
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Variable name as a string in Javascript

Is there a way to get a variable name as a string in Javascript? (like NSStringFromSelector in Cocoa ) 17 Answers ...