The recalled command is displayed on the screen just as if you had typed it and can be edited using the function keys described above. Again, this process can be continued through the last 20 commands. 20 being the oldest command issued. In order for line editing to work your terminal must be set to line editing mode. Subdirectories One of the most powerful and useful features of VMS is the capability of building subdirectories.
Subdirectories are especially valuable as a file management tool.
The first of these commands always moves you back to your main directory while the second command moves you up one level in your directory tree structure. Because you only have a first level subdirectory, the two commands are essentially equivalent in this case. Rename will essentially move the file to the new location, whereas COPY will create a duplicate copy in the new location. They are valuable because they provide simplicity and efficiency. They also give device and file independence in programs, but this is not pertinent to this document.