How can an iron nail be magnetized permanently​

With only basic materials such as a permanent magnet, electrical wires and a battery, a teacher can demonstrate different ways to magnetize an iron nail. He can turn a nail into an electromagnet, or permanently magnetize it by rubbing it with another magnet.

the entire statement is true and correct.  

there's no diagram, nothing is illustrated, and no question is asked.

where’s the list ? the question is incomplete