Quiting vi code example

Example 1: vi quit

# ESC to start command prompt, then
:q!		# exit vi without saving
:wq!	# exit vi with saving (! means exiting even if file is read only)

Example 2: vim discard changes and quit command

Vim editor:
Insert: hit I key
Discard and exit: esc q!
Save and exit: esc qw