diff --git a/System/File/ContainerInterface.php b/System/File/ContainerInterface.php
index 4bfbc08cc..640665651 100644
--- a/System/File/ContainerInterface.php
+++ b/System/File/ContainerInterface.php
@@ -193,6 +193,18 @@ interface ContainerInterface
      */
     public static function basename(string $path) : string;
 
+    /**
+     * Make name/path operating system safe.
+     *
+     * @param string $path Path of the resource
+     *
+     * @return string
+     *
+     * @since  1.0.0
+     * @author Dennis Eichhorn <d.eichhorn@oms.com>
+     */
+    public static function sanitize(string $path) : string;
+
     /**
      * Get amount of sub-resources.
      *
diff --git a/System/File/DirectoryInterface.php b/System/File/DirectoryInterface.php
index c6c09cbdf..5d9445f41 100644
--- a/System/File/DirectoryInterface.php
+++ b/System/File/DirectoryInterface.php
@@ -44,7 +44,7 @@ interface DirectoryInterface extends ContainerInterface, \Iterator, \ArrayAccess
      * @since  1.0.0
      * @author Dennis Eichhorn <d.eichhorn@oms.com>
      */
-    public static function count(string $path, bool $recursive = false, array $ignore = []) : int;
+    public static function count(string $path, bool $recursive = true, array $ignore = []) : int;
 
     /**
      * Get node by name.
diff --git a/System/File/Local/Directory.php b/System/File/Local/Directory.php
index 2ef75b9ee..140094950 100644
--- a/System/File/Local/Directory.php
+++ b/System/File/Local/Directory.php
@@ -130,7 +130,7 @@ class Directory extends FileAbstract implements DirectoryInterface
      * {@inheritdoc}
      */
     public static function count(string $path, bool $recursive = true, array $ignore = ['.', '..', 'cgi-bin',
-                                                                                               '.DS_Store'])
+                                                                                               '.DS_Store']) : int
     {
         $size  = 0;
         $files = scandir($path);
@@ -217,7 +217,7 @@ class Directory extends FileAbstract implements DirectoryInterface
     /**
      * {@inheritdoc}
      */
-    public static function permission(string $path) : int
+    public static function permission(string $path) : string
     {
         // TODO: Implement permission() method.
     }
@@ -246,6 +246,14 @@ class Directory extends FileAbstract implements DirectoryInterface
         return file_exists($path);
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    public static function sanitize(string $path) : string
+    {
+        return preg_replace('[^\w\s\d\.\-_~,;:\[\]\(\]\/]', '', $path);
+    }
+
     /**
      * {@inheritdoc}
      */
diff --git a/System/File/Local/File.php b/System/File/Local/File.php
index 6b9b893f2..38a3737bf 100644
--- a/System/File/Local/File.php
+++ b/System/File/Local/File.php
@@ -14,6 +14,7 @@
  * @link       http://orange-management.com
  */
 namespace phpOMS\System\File\Local;
+
 use phpOMS\System\File\ContainerInterface;
 use phpOMS\System\File\ContentPutMode;
 use phpOMS\System\File\FileInterface;
@@ -139,6 +140,14 @@ class File extends FileAbstract implements FileInterface
         return Directory::parent(dirname($path));
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    public static function sanitize(string $path) : string
+    {
+        return preg_replace('[^\w\s\d\.\-_~,;:\[\]\(\]]', '', $path);
+    }
+
     /**
      * {@inheritdoc}
      */
@@ -196,7 +205,7 @@ class File extends FileAbstract implements FileInterface
     /**
      * {@inheritdoc}
      */
-    public static function permission(string $path) : int
+    public static function permission(string $path) : string
     {
         if (!file_exists($path)) {
             throw new PathException($path);