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 use a command line 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:framewo rk: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\Say hello</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

custom command line

Now you can run the command to see the result

command line result