To test some DOS commands you can go to Start/Run and write CMD and go to a DOS command line.

“copy con” – A user can create a file using this command. Example: “Copy con example.txt”
“md one two three” – To quickly create multiple folders at same time in DOS.
“rd /s” – The DelTree command is not supported anymore. You can use rd with the /s option to do the same thing.
“Type”, “Edit” – Use Type or Edit to see a file contents.