Copy con is an MS-DOS and Windows command line command that allows the creation of a file through the command line. 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 are returned to a blank line, which is the start of your file. Enter the lines you want to insert in the file and, when done, press Ctrl+Z to create the file. To cancel the creation of the file, press Ctrl+C.
In Windows 10, after you press Ctrl+Z, press Enter to save and close the file.
In Windows 8 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.