This trait can be used to write console output from service classes.

ConsoleOutputTrait.php

<?php
namespace Yout\Package\Command;

/*
 * This script belongs to the Flow package "Your.Package".
 */

use TYPO3\Flow\Cli\ConsoleOutput;

/**
 * A trait to add ConsoleOutput functionality to other service classes
 */
trait ConsoleOutputTrait
{

    /**
     * @var ConsoleOutput
     */
    protected $consoleOutput = null;

    /**
     * Console output
     *
     * @param ConsoleOutput $consoleOutput
     */
    public function setConsoleOutput(ConsoleOutput $consoleOutput)
    {
        $this->consoleOutput = $consoleOutput;
    }

    /**
     * Writes line to console output
     *
     * This function does nothing in Web context
     *
     * @param $text
     * @param array $arguments
     */
    protected function consoleOutputLine($text, $arguments = [])
    {
        if ($this->consoleOutput !== null && FLOW_SAPITYPE === 'CLI') {
            $this->consoleOutput->outputLine($text, $arguments);
        }
    }
}