CommandRendererBackground.php

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<?php
namespace Magento\Framework\Shell;

use Magento\Framework\OsInfo;

class CommandRendererBackground extends CommandRenderer
{
    protected $osInfo;

    public function __construct(OsInfo $osInfo)
    {
        $this->osInfo = $osInfo;
    }

    public function render($command, array $arguments = [])
    {
        $command = parent::render($command, $arguments);

        return $this->osInfo->isWindows() ?
            'start /B "magento background task" ' . $command
            : str_replace('2>&1', '> /dev/null &', $command);
    }
}