require 'dbm'

testdb = DBM.open("test_db")
if testdb["testval"]
  print "We found testval #{testdb["testval"]} - removing\n"
  testdb.delete "testval"
else
  value = rand(255)
  print "No testval - adding #{value}\n"
  testdb["testval"] = value
end
testdb.close