diff --git a/tools/build_script.sh b/tools/build_script.sh
index 30591ddc7ff85cc58c4fc7ef932e55be07b710e5..770de73d12a682c4a5466efdefad965fd68fef2b 100644
--- a/tools/build_script.sh
+++ b/tools/build_script.sh
@@ -1,3 +1,25 @@
+#!/usr/bin/env bash
+
+# Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+#=================================================
+#                   Utils
+#=================================================
+
+set -ex
+
 function init() {
     RED='\033[0;31m'
     BLUE='\033[0;34m'