Vi Short Command Reference
| Vi short command reference(Learn or review your Vi commands with this concise reference) | 
Operation
| i | input mode | 
| esc | command mode | 
| :se number | display line numbers | 
| :se nonumber | don't display line numbers | 
| :e | open file | 
| :w | save (write) file to disk | 
| :wq | save and quit | 
| :q! | quit but don't save | 
| number,command | apply command number times (e.g. 4,x = delete 4 characters) | 
| . | repeat last effective cmd | 
| esc,u | undo it | 
| ctrl-r | redo it | 

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