CommandRenderer.php

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<?php
namespace Magento\Framework\Shell;

class CommandRenderer implements CommandRendererInterface
{
    public function render($command, array $arguments = [])
    {
        $command = preg_replace('/(\s+2>&1)*(\s*\|)|$/', ' 2>&1$2', $command);
        $arguments = array_map('escapeshellarg', $arguments);
        if (empty($arguments)) {
            return $command;
        }
        return vsprintf($command, $arguments);
    }
}