Copy con is an MS-DOS and Windows command line command that allows the creation of a file through the command prompt. To use this command type copy con followed by the name of the file you want to create as shown below.
copy con myfile.txt
After this command is typed, you'll be returned to a blank line, which is the start of your file. Enter the lines you want to insert into the file and, when done, press Ctrl+Z to create the file. If you want to cancel the creation of the file, press Ctrl+C.
Tip: Although this is a fast way to create a small file, if you need to edit a file or work on something larger, use a text editor, such as Windows Notepad. You can start Notepad from a command line using the start command.
Note: In Windows 8, 8.1, and 10, if there is text already in the file, pressing Ctrl+C deletes the last line of text and saves the file. If you are on the first line or have not typed any text, pressing Ctrl+C cancels the creation of the file.