Command Action:
vi                           Starts the Vi editor
vi <filename>  Starts Vi and opens the given file for editing
:q!                         Exits the Vi editor without saving changes (quit!)
:wq!                      Exits the Vi editor and saves changes (write and quit!)
:set nu                 Turns on line numbering
esc                        Exits text insert mode
i                             Enters text insert mode
Arrow keys         Navigates the cursor
Backspace key    Deletes previous character
Delete                   Deletes selected character
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