How to Add Command line in to Console CLI in Magento 2

In this article, we will find how to add a command line into magento 2 console CLI. Magento 2 add command line use a interface to quick change some features like enable/disable cache, setup sample data… Before we start, please take some minutes to know about the naming in Magento 2 CLI.
We will use an example module Mageplaza_Example to demo for this lesson. To add an option to Magento 2 CLI, we will follow by some steps:

Step 1: Define command in di.xml

In di.xml file, you can use a type with name Magento\Framework\Console\CommandList to define the command option.
File: app/code/Mageplaza/HelloWorld/etc/di.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
   <type name="Magento\Framework\Console\CommandList">
       <arguments>
           <argument name="commands" xsi:type="array">
               <item name="exampleSayHello" xsi:type="object">Mageplaza\HelloWorld\Console\Sayhello</item>
           </argument>
       </arguments>
   </type>
</config>

This config will declare a command class Sayhello. This class will define the command name and execute() method for this command.

Step 2: Create command class

As define in di.xml, we will create a command class:
File: app/code/Mageplaza/HelloWorld/Console/Sayhello.php

<?php
namespace Mageplaza\HelloWorld\Console;

use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;

class Sayhello extends Command
{
   protected function configure()
   {
       $this->setName('example:sayhello');
       $this->setDescription('Demo command line');
   }
   protected function execute(InputInterface $input, OutputInterface $output)
   {
       $output->writeln("Hello World");
   }
}

In this function, we will define 2 methods:

• configure() method is used to set the name and the description of the magento 2 add command line
• execute() method will run when we call this command line via console.

After declare this class, please flush Magento cache and type this command:

php magento --list

You will see the list of all commands. Our command will be show here

Now you can run the command to see the result

Next tutorial: Command Line Interface CLI »

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