--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/sun/security/tools/keytool/DupCommands.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @bug 8183509
+ * @summary keytool should not allow multiple commands
+ * @library /test/lib
+ * @build jdk.test.lib.SecurityTools
+ *        jdk.test.lib.Utils
+ *        jdk.test.lib.Asserts
+ *        jdk.test.lib.JDKToolFinder
+ *        jdk.test.lib.JDKToolLauncher
+ *        jdk.test.lib.Platform
+ *        jdk.test.lib.process.*
+ * @run main/othervm DupCommands
+ */
+
+import jdk.test.lib.SecurityTools;
+import jdk.test.lib.process.OutputAnalyzer;
+
+public class DupCommands {
+
+    public static void main(String[] args) throws Throwable {
+
+        kt("-list -printcert")
+                .shouldHaveExitValue(1)
+                .shouldContain("Only one command is allowed");
+
+        kt("-import -importcert") // command with different names
+                .shouldHaveExitValue(1)
+                .shouldContain("Only one command is allowed");
+
+        kt("-help -v -v")
+                .shouldHaveExitValue(0)
+                .shouldContain("The -v option is specified multiple times.");
+
+        kt("-help -id 1 -id 2") // some options are allowed multiple times
+                .shouldHaveExitValue(0)
+                .shouldNotContain("specified multiple times.");
+    }
+
+    static OutputAnalyzer kt(String arg) throws Exception {
+        return SecurityTools.keytool(arg);
+    }
+}