echo a customized message with VIM editor

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http://unix.stackexchange.com – How can I deltect if there is a file modification in VIM upon exiting (:q)? If there is a file modification Vim echos E37: No write since last change (add ! to override) I want to override this message with a custom message and an action similar to File modified: Do you wish to save the file? (y)Yes (n)No (c)Cancel I have modified Vim's behavior to save file on Ctrl-s and quit on Ctrl-w Now I am looking for a solution if the file is already modified and user is quitting it with Ctrl-w I want Vim to prompt to save. Here is the content of my .vimrc file: map <C-S> :w<CR> i (HowTos)