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How do I change my Ruby version using RVM?

I am not able to switch the current Ruby version: 13 Answers 13 ...
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Test if a command outputs an empty string

How can I test if a command outputs an empty string? 11 Answers 11 ...
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Golang: How to pad a number with zeros when printing?

How can I print a number or make a string with zero padding to make it fixed width? 6 Answers ...
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C++ static virtual members?

Is it possible in C++ to have a member function that is both static and virtual ? Apparently, there isn't a straightforward way to do it ( static virtual member(); is a compile error), but is there at least a way to achieve the same effect? ...
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Can gcc output C code after preprocessing?

I'm using an open source library which seems to have lots of preprocessing directives to support many languages other than C. So that I can study what the library is doing I'd like to see the C code that I'm compiling after preprocessing, more like what I'd write. ...
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Regular expression to match a dot

Was wondering what the best way is to match "test.this" from "blah blah blah test.this@gmail.com blah blah" is? Using Python. ...
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Converting any string into camel case

How can I convert a string into camel case using javascript regex? 33 Answers 33 ...
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The order of keys in dictionaries

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Convert character to ASCII code in JavaScript

How can I convert a character to its ASCII code using JavaScript? 10 Answers 10 ...
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How do I get the name of the active user via the command line in OS X?

How do I get the name of the active user via the command line in OS X? 12 Answers 12 ...