IoInterface.php

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<?php
namespace Magento\Framework\Filesystem\Io;

interface IoInterface
{
    public function open(array $args = []);

    public function close();

    public function mkdir($dir, $mode = 0777, $recursive = true);

    public function rmdir($dir, $recursive = false);

    public function pwd();

    public function cd($dir);

    public function read($filename, $dest = null);

    public function write($filename, $src, $mode = null);

    public function rm($filename);

    public function mv($src, $dest);

    public function chmod($filename, $mode);

    public function ls($grep = null);

    public function dirsep();
}