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What does `kill -0 $pid` in a shell script do?

Basically, what signal does '0' represent, because here I see SIGNAL numbers starting from 1. 6 Answers ...
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ToList()— does it create a new list?

Let's say I have a class 12 Answers 12 ...
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Why is === faster than == in PHP?

Why is === faster than == in PHP? 11 Answers 11 ...
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A simple explanation of Naive Bayes Classification

I am finding it hard to understand the process of Naive Bayes, and I was wondering if someone could explain it with a simple step by step process in English. I understand it takes comparisons by times occurred as a probability, but I have no idea how the training data is related to the actual datase...
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Fastest way to reset every value of std::vector to 0

What's the fastest way to reset every value of a std::vector<int> to 0 and keeping the vectors initial size ? 6 An...
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Can you set a border opacity in CSS?

Is there a straight forward CSS way to make the border of an element semi-transparent with something like this? 9 Answers ...
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How to compute the sum and average of elements in an array?

I am having problems adding all the elements of an array as well as averaging them out. How would I do this and implement it with the code I currently have? The elements are supposed to be defined as I have it below. ...
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Razor HtmlHelper Extensions (or other namespaces for views) Not Found

Dunno if this was happening in the PR or Beta, but if I create an extension method on HtmlHelper , it is not recognized in a Razor powered page: ...
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How do I do base64 encoding on iOS?

I'd like to do base64 encoding and decoding, but I could not find any support from the iPhone SDK . How can I do base64 encoding and decoding with or without a library? ...
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Is it possible to set a number to NaN or infinity?

Is it possible to set an element of an array to NaN in Python? 4 Answers 4 ...