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Format decimal for percentage values?

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How do I check if a string is valid JSON in Python?

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Do I need to manually close an ifstream?

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Return 0 if field is null in MySQL

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LINQ query to return a Dictionary

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Elevating process privilege programmatically?

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How do I select child elements of any depth using XPath?

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Namespace for [DataContract]

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Hex representation of a color with alpha channel?

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How do I negate a test with regular expressions in a bash script?

Using GNU bash (version 4.0.35(1)-release (x86_64-suse-linux-gnu), I would like to negate a test with Regular Expressions. For example, I would like to conditionally add a path to the PATH variable, if the path is not already there, as in: ...