Slim Framework 3 as cli command

cli.php

<?php

// php cli.php /update

require __DIR__ . '/vendor/autoload.php';

if (PHP_SAPI == 'cli') {
    $argv = $GLOBALS['argv'];
    array_shift($argv);

    $pathInfo = implode('/', $argv);

    $env = \Slim\Http\Environment::mock(['REQUEST_URI' => $pathInfo]);

    $settings = require __DIR__ . '/src/settings.php'; // here are return ['settings'=>'']

    $settings['environment'] = $env;

    $app = new \Slim\App($settings);

    $container = $app->getContainer();
    $container['errorHandler'] = function ($container) {
        return function ($request, $response, $exception) use ($container) {
            print('error');
            exit(1);
        };
    };

    $container['notFoundHandler'] = function ($container) {
        return function ($request, $response) use ($container) {
            print('not_found');
            exit(1);
        };
    };

    $app->get('/update', function ($request, $response, $args) {
        return 'update!';
    });

    $app->run();
}

Nice! Works perfectly.