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Linux: compute a single hash for a given folder & contents?

Surely there must be a way to do this easily! 15 Answers 15 ...
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How to make an OpenGL rendering context with transparent background?

Rendering contexts usually have a solid color on the background (black or whatever, see the image below): 9 Answers ...
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How are software license keys generated?

..., this strikes me as (in)Security Through Obscurity , although I really have no idea how license keys are generated. What is a good (secure) example of license key generation? What cryptographic primitive (if any) are they using? Is it a message digest? If so, what data would they be hashing? What ...
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What to do Regular expression pattern doesn't match anywhere in string?

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Convert PDF to clean SVG? [closed]

I'm attempting to convert a PDF to SVG. However, the one I am using currently maps a path for every letter in every piece of text, meaning if I change the text in its source file, it looks ugly. ...
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How to find out the number of CPUs using python

I want to know the number of CPUs on the local machine using Python. The result should be user/real as output by time(1) when called with an optimally scaling userspace-only program. ...
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Saving utf-8 texts in json.dumps as UTF8, not as \u escape sequence

sample code: 12 Answers 12 ...
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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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Get last n lines of a file, similar to tail

I'm writing a log file viewer for a web application and for that I want to paginate through the lines of the log file. The items in the file are line based with the newest item on the bottom. ...
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How to use double or single brackets, parentheses, curly braces

I am confused by the usage of brackets, parentheses, curly braces in Bash, as well as the difference between their double or single forms. Is there a clear explanation? ...