How to use VI Editor
Vi eiditor is helpfull to edit files like php.ini on your server. Here is some common commands that are helpfull for navigating through VI editor.
vi /path/filename <Enter> will open up the file for editing
i <Enter> Insert mode, for editing documents
: x <Enter> quit vi, Save Changes
:wq <Enter> quit vi, Save Changes
:q <Enter> quit (or exit) vi
:q! <Enter> quit vi even...