How to Exit vi

Press escape to get into command mode if you re not already in command mode (i.e. if you are in insert/edit mode) .. Even if you are not in the edit mode press escape any way, it s OK. 

So, press esc, then

type one of these:

:q to quit and dont save
:q! to quit with out saving changes or prompts (if you have made changes)
:w to save
:wq to save and quit 


:x to save and quit 


emacs - ^X^S to save, ^X^C to quit
esc shift^ZZ to save and exit.


Notes:

Adding an exclamation mark at the end of the command means "do it!" - as in  :q!

When you will press escape the "insert" mode will be disabled, then you need to type : After that you can provide q! or w or wq and hit enter.