Magento2 Webkul Custom Command Module - allow to create your own custom commands, and here we created command to delete orders
copy and paste the downloaded folder & file to app/code/Webkul/CustomCommand
php bin/magento setup:upgrade
Run the following commands in terminal-
composer require webkul/custom-command dev-master
php bin/magento setup:upgrade
now module is properly installed
Follow the blog link http://webkul.com/blog/how-to-create-custom-command-to-delete-order-in-magento2/