Drush 9 @sites workaround for Drupal 8

drall.php

#!/usr/bin/php
<?php
/*
 * Usage:
 * ./drall.php [local/dev8/stage8/ww1] drushcommand
 * ex: ./drall.php local cim
 *
 */
  // Path to sites.php file.
  include('docroot/sites/sites.php');

  $done = [];
  $argv = $_SERVER['argv'];

  array_shift($argv);
  $env = array_shift($argv);
  $parameters = implode(' ', $argv);

  $commandPattern = "drush --uri=:key $parameters";

  foreach ($sites as $key => $site) {
    if (count($argv) >= 1 && strpos($key, $env) !== false) {
      $command = str_replace(':key', $key, $commandPattern);
      echo "Executing command `$command` on $site\n";
      `$command`;
      $done[] = $site;
    }
  }

sites.php

$sites['local.oswego.edu.accessibility']='accessibility';
$sites['dev8.oswego.edu.accessibility']='accessibility';
$sites['stage8.oswego.edu.accessibility']='accessibility';
$sites['ww1.oswego.edu.accessibility']='accessibility';

$sites['local.oswego.edu.orientation']='orientation';
$sites['dev8.oswego.edu.orientation']='orientation';
$sites['stage8.oswego.edu.orientation']='orientation';
$sites['ww1.oswego.edu.orientation']='orientation';

Cool! Came across this gist while looking for jigarius/drall on Google to see if my package was searchable. The package jigarius/drall brings this functionality out of the box and you might find it useful 👨‍💻