--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/contrib/maintainers-verify.sh	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,45 @@
+#!/bin/sh
+
+# Copyright (C) 2018 Free Software Foundation, Inc.
+#
+# This file is part of GCC.
+#
+# GCC is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+#
+# GCC is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GCC; see the file COPYING.  If not, write to
+# the Free Software Foundation, 51 Franklin Street, Fifth Floor,
+# Boston, MA 02110-1301, USA.
+
+if [ "$1" != "" ]; then
+    f="$1"
+else
+    f=./MAINTAINERS
+fi
+
+grep @ $f \
+    | sed 's/[\t][\t]*/\t/g' \
+    | awk -F '\t' \
+	  "
+{
+  if (NF == 2) {
+    name=\$1
+    email=\$2
+    if (names[name] == 1) {
+        printf \"Redundant in write approval: %s\n\", name
+    }
+  } else if (NF == 3 ) {
+    name=\$2
+    email=\$3
+    names[name] = 1
+  }
+}
+"