Magento2 – How to get Directory of a Module

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Here is the code how to load your module directory: 
        $objectManager = \Magento\Framework\App\ObjectManager::getInstance();
        $directoryReader = $objectManager->create('\Magento\Framework\Module\Dir\Reader');
        $moduleDirectory = $directoryReader->getModuleDir('', 'Knowthemage_Hello');
        echo "Directory : ".$moduleDirectory;