Merge pull request #3570 from MVKozlov/patch-1

Return non-zero on display usage

library/Icinga/Application/Cli.php

@@ -146,11 +146,14 @@ class Cli extends ApplicationBootstrap
     {
         $loader = $this->cliLoader();
         $loader->parseParams();
-        $loader->dispatch();
+        $result = $loader->dispatch();
         Benchmark::measure('All done');
         if ($this->showBenchmark) {
             Benchmark::dump();
         }
+        if ($result === false) {
+            exit(3);
+        }
     }
 
     protected function dispatchEndless()

library/Icinga/Cli/Command.php

@@ -198,6 +198,7 @@ abstract class Command
             $this->commandName,
             $action
         );
+        return false;
     }
 
     public function init()