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What is the difference between user and kernel modes in operating systems?

What are the differences between User Mode and Kernel Mode, why and how do you activate either of them, and what are their use cases? ...
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How can I split a text into sentences?

...Russian -- see can NLTK/pyNLTK work “per language” (i.e. non-english), and how?. – martineau Jan 2 '11 at 0:28 ...
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Adjusting the Xcode iPhone simulator scale and size [duplicate]

...5 in Xcode, be the actual size of the iPhone 5. I'm getting a huge display and things seemed to be scaled. 8 Answers ...
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How to check if command line tools is installed

...as it appears in the Applications directory. There are also the xcodebuild and xcode-select files in /usr/bin I need to know if the command line tools is installed. Is there a command for it? What can I do to see if XCode CLT is installed and if yes to find the version installed? ...
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What is the difference between static func and class func in Swift?

... Is it simply that static is for static functions of structs and enums, and class for classes and protocols? That's the main difference. Some other differences are that class functions are dynamically dispatched and can be overridden by subclasses. Protocols use the class keyword, b...
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Where is the “Fold” LINQ Extension Method?

... prod * next); See MSDN for more information. It lets you specify a seed and then an expression to calculate successive values. share | improve this answer | follow ...
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Importing variables from another file?

... from file1 import * will import all objects and methods in file1 share | improve this answer | follow | ...
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How to exit from Python without traceback?

... You are presumably encountering an exception and the program is exiting because of this (with a traceback). The first thing to do therefore is to catch that exception, before exiting cleanly (maybe with a message, example given). Try something like this in your main r...
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Delete everything in a MongoDB database

...way everything in a database—that is, to delete every single collection, and whatever else might be lying around, and start from scratch. Is there a single line of code that will let me do this? Bonus points for giving both a MongoDB console method and a MongoDB Ruby driver method. ...
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What is the difference between active and passive FTP?

Can someone tell me what is the difference between active and passive FTP? Which one is preferable? 5 Answers ...