.Undo of deleted file
Undo line command is avail for the file deleted by line command.
Deleted files by DOS command is not undo-able.
Undo line command support also Move/Rename line command.
Delete line command has other variation, Not undo-able(z),
Delete also ReadOnly file(/) and Both undo-able and del ReadOnly(0).
directory and un-deletability.
+---+-------+---------------+
|cmd|undo | For ReadOnly |
+---+-------+---------------+
| d |Avail | Error |
| / |Avail | Deleted |
| z |N/A | Error |
| 0 |N/A | Deleted |
+---+-------+---------------+