Magento 2.0.18 is the final 2.0.x release. After March 2018, Magento 2.0.x will no longer receive security patches, quality fixes, or documentation updates.
To maintain your site's performance, security, and PCI compliance, upgrade to the latest version of Magento.

Add CLI commands

You module can optionally use Magento 2’s Symfony-based command-line interface (CLI) to provide commands for users to interact with. To use the CLI, see the following topics: