Vi commands that you should know
Editing Commands
vi <new filename> or <existing filename> — to make a file or edit
i : Insert at cursor
a : Write after cursor
A : Write at the end of line
o : open a new line
dd : Delete the line
D : Delete contents of line after the cursor
C : Delete contents of a line after the cursor and insert new text.
r : Replace character
R : Overwrite characters from cursor on ward
~ : Change case of individual character
ESC : Terminate insert mode
Moving Commands
k : Move cursor up
j : Move cursor down
h : Move cursor left
l : Move cursor right
Saving & Closing the file Commands
ESC : Terminate insert mode
Shift + zz : Save the file and quit
:w : Save the file staying open
:q : Quit with no saving
:wq : Save the file and quit
