diff --git a/src/AbstractApplication.php b/src/AbstractApplication.php
index f311df9..95d5b90 100644
--- a/src/AbstractApplication.php
+++ b/src/AbstractApplication.php
@@ -80,6 +80,11 @@ abstract class AbstractApplication implements ApplicationInterface
         'endMemory'   => 0,
     ];
 
+    /**
+     * @var int
+     */
+    private int $exitCode = 0;
+
     /**
      * @var string
      */
@@ -341,6 +346,10 @@ protected function afterRun(): void
     #[NoReturn]
     public function stop(int $code = 0): void
     {
+        if ($code === 0) {
+            $code = $this->exitCode;
+        }
+
         // call 'onAppStop' event, if it is registered.
         $this->fire(self::ON_STOP_RUN, $this);
 
@@ -880,4 +889,20 @@ public function getCommandName(): string
     {
         return $this->commandName;
     }
+
+    /**
+     * @return int
+     */
+    public function getExitCode(): int
+    {
+        return $this->exitCode;
+    }
+
+    /**
+     * @param int $exitCode
+     */
+    public function setExitCode(int $exitCode): void
+    {
+        $this->exitCode = $exitCode;
+    }
 }
diff --git a/src/Controller.php b/src/Controller.php
index dc4a7aa..193d998 100644
--- a/src/Controller.php
+++ b/src/Controller.php
@@ -202,14 +202,14 @@ protected function disabledCommands(): array
     }
 
     /**
-     * Will call it on action(sub-command) not found on the group.
+     * Will call it on subcommand not found on the group.
      *
-     * @param string $action
+     * @param string $command
      * @param array  $args
      *
      * @return bool if return True, will stop goon render group help.
      */
-    protected function onNotFound(string $action, array $args): bool
+    protected function onNotFound(string $command, array $args): bool
     {
         // TIP: you can add custom logic on sub-command not found.
         return false;
@@ -310,7 +310,7 @@ public function doRun(array $args): mixed
             }
 
             // if command not exists.
-            return $this->handleNotFound($name, $action, $args);
+            return $this->handleNotFound($name, $command, $args);
         }
 
         // init flags for subcommand
@@ -434,29 +434,29 @@ final public function execute(Input $input, Output $output): mixed
 
     /**
      * @param string $group
-     * @param string $action
+     * @param string $command
      * @param array  $args
      *
      * @return int
      */
-    protected function handleNotFound(string $group, string $action, array $args): int
+    protected function handleNotFound(string $group, string $command, array $args): int
     {
         // if user custom handle not found logic.
-        if ($this->onNotFound($action, $args)) {
-            $this->debugf('user custom handle the "%s" action "%s" not found', $group, $action);
+        if ($this->onNotFound($command, $args)) {
+            $this->debugf('group: %s - user custom handle the subcommand "%s" not found', $group, $command);
             return 0;
         }
 
-        $this->debugf('action "%s" not found on the group controller "%s"', $action, $group);
+        $this->debugf('group: %s - command "%s" is not found on the group', $group, $command);
 
         // if you defined the method '$this->notFoundCallback' , will call it
         // if (($notFoundCallback = $this->notFoundCallback) && method_exists($this, $notFoundCallback)) {
         //     $result = $this->{$notFoundCallback}($action);
         // } else {
-        $this->output->liteError("Sorry, The command '$action' not exist of the group '$group'!");
+        $this->output->liteError("Sorry, The command '$command' not exist of the group '$group'!");
 
         // find similar command names
-        $similar = Helper::findSimilar($action, $this->getAllCommandMethods(null, true));
+        $similar = Helper::findSimilar($command, $this->getAllCommandMethods(null, true));
 
         if ($similar) {
             $this->output->writef("\nMaybe what you mean is:\n    <info>%s</info>", implode(', ', $similar));
diff --git a/src/Util/FormatUtil.php b/src/Util/FormatUtil.php
index a16f34b..21b2ca9 100644
--- a/src/Util/FormatUtil.php
+++ b/src/Util/FormatUtil.php
@@ -173,6 +173,7 @@ public static function spliceKeyValue(array $data, array $opts = []): string
             'keyMaxWidth' => 0, // if not set, will automatic calculation
             'ucFirst'     => true,  // upper first char for value
             'endNewline'  => true,  // with newline on end.
+            'filterEmpty' => false,
         ], $opts);
 
         if ($opts['keyMaxWidth'] < 1) {
@@ -188,8 +189,13 @@ public static function spliceKeyValue(array $data, array $opts = []): string
         $keyStyle  = trim($opts['keyStyle']);
         $keyPadPos = (int)$opts['keyPadPos'];
 
+        $filter = (bool)$opts['filterEmpty'];
         $fmtLines = [];
         foreach ($data as $key => $value) {
+            if ($filter && empty($value)) {
+                continue;
+            }
+
             $hasKey  = !is_int($key);
             $fmtLine = $opts['leftChar'];