Reindex using Command line in Magento2

Magento2
Here Explain how to handle reindex using command line in magento2. In root magento directory [sourcecode language="plain"]php bin/magento indexer:reindex[/sourcecode]   in root/bin directory [sourcecode language="plain"]php magento indexer:reindex[/sourcecode]   To get the index name to run index one by one first write below command to get info in magento root directory [sourcecode language="plain"]php bin/magento indexer:info[/sourcecode]   To run single reindexing command [sourcecode language="plain"]php bin/magento indexer:reindex indexer_name[/sourcecode]   indexer name which we received name from indexer:info   [JWD-Magento-Development]
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How to create simple module magento2

Magento, Magento2
Here we go to create your first or very simple module in magento2. We are going to create module with Namespace is "Jwd" and Module Name is "WelcomeWorld". Step1: Create a module.xml file in app/code/Jwd/WelcomeWorld/etc/module.xml [sourcecode language="plain"] <?xml version="1.0"?> <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../../../lib/internal/Magento/Framework/Module/etc/module.xsd"> <module name="Jwd_WelcomeWorld" setup_version="1.0.0"> </module> </config> [/sourcecode]   Step2: Create app/code/Jwd/WelcomeWorld/registration.php [php] <?php \Magento\Framework\Component\ComponentRegistrar::register( \Magento\Framework\Component\ComponentRegistrar::MODULE, 'Jwd_WelcomeWorld', __DIR__ ); ?> [/php]   Step3: Create a frontend router in app/code/Jwd/WelcomeWorld/etc/frontend/routes.xml [sourcecode language="plain"] <?xml version="1.0"?> <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:App/etc/routes.xsd"> <router id="standard"> <route id="welcomeworld" frontName="welcomeworld"> <module name="Jwd_WelcomeWorld"/> </route> </router> </config> [/sourcecode]   Step4: Create the file index.php for controller action in app/code/Jwd/WelcomeWorld/Controller/Index. This will map to http://127.0.0.1/magento2/welcomeworld/index/index welcomeworld: front name index: name of controller folder index: name of action file – index.php Each action is its own class extending \Magento\Framework\App\Action\Action. In every action file,…
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