Added getUserName()

Author: SmetDenis

src/Sys.php

@@ -51,6 +51,16 @@ public static function isRoot(): bool
         return false; // @codeCoverageIgnore
     }
 
+    /**
+     * Returns current linux user who runs script
+     * @return string|null
+     */
+    public function getUserName()
+    {
+        $userInfo = posix_getpwuid(posix_geteuid());
+        return $userInfo['name'] ?? null;
+    }
+
     /**
      * Returns a home directory of current user.
      *