diff --git a/Mage/Command/BuiltIn/List.php b/Mage/Command/BuiltIn/List.php
new file mode 100644
index 0000000..7a5e06d
--- /dev/null
+++ b/Mage/Command/BuiltIn/List.php
@@ -0,0 +1,42 @@
+getConfig()->getArgument(1);
+
+ try {
+ switch ($subCommand) {
+ case 'environments':
+ $this->_environment();
+ break;
+ }
+ } catch (Exception $e) {
+ Mage_Console::output('' . $e->getMessage() . '', 1, 2);
+ }
+ }
+
+ private function _environment()
+ {
+ $environments = array();
+ $content = scandir('.mage/config/environment/');
+ foreach ($content as $file) {
+ if (strpos($file, '.yml') !== false) {
+ $environments[] = str_replace('.yml', '', $file);
+ }
+ }
+ sort($environments);
+
+ if (count($environments) > 0) {
+ Mage_Console::output('These are your configured environments:', 1, 1);
+ foreach ($environments as $environment) {
+ Mage_Console::output('* ' . $environment . '', 2, 1);
+ }
+ Mage_Console::output('', 1, 1);
+
+ } else {
+ Mage_Console::output('You don\'t have any environment configured.', 1, 2);
+ }
+ }
+}
\ No newline at end of file