This editor is mainly meant as a demonstration of the multi-level undo/redo mechanism, not as a really useful application. It is a line-oriented editor like in the good old days of DOS 'edlin' ;-).
The editor provides the following commands:
| Command | Command description |
| h | Command help |
| i | Insert line |
| d | Delete line |
| j | Move to previous line |
| k | Move to next line |
| c | Output current line |
| o | Output whole text |
| w | Clear text buffer |
| u | Undo command |
| r | Redo command |
| z | Resize history |
| l | Load text |
| s | Save text |
| q | Quit editor |