I wrote this script for iCloud sync problem. all my documents and desktop folders are duplicated because of the problem. This script uses '* 2.*' pattern to find and check the original file if they are same it will delete if you add 'delete' and of the command. copy this file under /usr/local/bin/.

icloud-duplicate-remover.php

#!/usr/bin/env php
<?php

clearstatcache();

$delete = !empty($argv[1]) && $argv[1] === 'delete';

/**
 * @param string      $folder
 * @param string|null $pattern
 *
 * @return \Generator
 */
function rsearch(string $folder, ?string $pattern = null): Generator
{
	$iti = new RecursiveDirectoryIterator($folder);
	foreach (new RecursiveIteratorIterator($iti) as $file)
	{
		$file_name = $file->getPathname();

		if ($file->isDir() || ($pattern !== null && !preg_match($pattern, $file_name)))
		{
			continue;
		}

		yield $file_name;
	}
}

$pwd = $_SERVER['PWD'];

$checksum = [];

if (!is_dir($pwd))
{
	die($pwd . ' should be directory');
}

$paths = rsearch($pwd, '/.* ([0-9]+)\..*$/su');
foreach ($paths as $path)
{
	$action = 'skipped';

	$path_sha1 = sha1_file($path);
	preg_match('/(.*)( (?:[0-9]+)\.)([^ ]+)$/su', $path, $matches);
	$path_org = $matches[1] . '.' . $matches[3];

	if (file_exists($path_org))
	{
		$path_org_sha1 = sha1_file($path_org);

		if ($path_org_sha1 === $path_sha1)
		{
			if ($delete === true)
			{
				unlink($path);
				$action = 'deleted';
			}
			else
			{
				$action = 'found';
			}
		}
	}

	echo $action . ' ' . $path . PHP_EOL;
}