diff --git a/tools/listuser.py b/tools/listuser.py
new file mode 100755
index 0000000..2e14d6b
--- /dev/null
+++ b/tools/listuser.py
@@ -0,0 +1,47 @@
+#!/usr/bin/python2.5
+
+import os
+import os.path
+import sys
+from config.Common import settings
+from controller.Database import Database
+from controller.Scheduler import Scheduler
+
+
+class Lister( object ):
+  def __init__( self, scheduler, database, username ):
+    self.scheduler = scheduler
+    self.database = database
+    self.username = username
+
+    threads = (
+      self.list_user(),
+    )
+
+    for thread in threads:
+      self.scheduler.add( thread )
+      self.scheduler.wait_for( thread )
+
+  def list_user( self ):
+    self.database.load( u"User %s" % self.username, self.scheduler.thread )
+    user = ( yield Scheduler.SLEEP )
+    if user is None:
+      print "user %s is unknown" % self.username
+    else:
+      print "user %s: %s" % ( self.username, user )
+
+
+def main( program_name, args ):
+  if len( args ) == 0:
+    print "usage: %s username" % program_name
+    sys.exit( 1 )
+
+  scheduler = Scheduler()
+  database = Database( scheduler, "data.db" )
+  initializer = Lister( scheduler, database, args[ 0 ] )
+  scheduler.wait_until_idle()
+
+
+if __name__ == "__main__":
+  import sys
+  main( sys.argv[ 0 ], sys.argv[ 1: ] )