diff --git a/show_devices.py b/show_devices.py
new file mode 100644
index 0000000..924ba3a
--- /dev/null
+++ b/show_devices.py
@@ -0,0 +1,63 @@
+# -*- Mode:python; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
+#
+# Copyright (C) 2014-2015 Regents of the University of California.
+# Author: Weiwei Liu <summerwing10@gmail.com>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program 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 Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+# A copy of the GNU Lesser General Public License is in the file COPYING.
+
+import sys
+import os
+import sqlite3
+from device_user_access_storage import DeviceUserAccessStorage
+def showDefault(databaseFilePath = None):
+    if databaseFilePath == None or databaseFilePath == "":
+        if not "HOME" in os.environ:
+            home = '.'
+        else:
+            home = os.environ["HOME"]
+
+        dbDirectory = os.path.join(home, '.ndn')
+        if not os.path.exists(dbDirectory):
+            os.makedirs(dbDirectory)
+
+        databaseFilePath = os.path.join(dbDirectory, 'ndnhome-controller.db')
+
+        database =  sqlite3.connect(databaseFilePath)
+        storage = DeviceUserAccessStorage(databaseFilePath)
+        cursor = database.cursor()
+        cursor.execute("SELECT id, prefix  FROM Device")
+        print 'id:     prefix:                  Commands:                   ServiceProfile:'
+        for row in cursor.fetchall():
+            commandResult = storage.getCommandsOfDevice(row[0])
+            commandStr =''
+            for command in commandResult:
+                commandStr += command[0] + ';'
+            profileResult = storage.getServiceProfilesOfDevice(row[0])
+            profileStr=''
+            for profile in profileResult:
+                profileStr = profile[0] +';'
+            print '%d    %s    %s    %s' %(row[0], row[1], commandStr, profileStr ) 
+            
+        cursor.close()
+
+
+
+if len(sys.argv) < 2:
+    showDefault()
+     
+else:
+    raise RuntimeError("options is not implemented yet") 
+    
+