vim mapping from q! to Q!

Question

I was trying to map 'q!' to 'Q!' in .vimrc ? I tried the following but not working. :command Q! q! Please provide any suggestion to mitigate this issue. Thank you.

Answer 1

You just have to give

:command Q q

Similarly, you can do for other commands like,

:command WQ wq
:command W w

Answer 2

This worked perfectly for me:

:command-bang Q q<bang>

From vim's help (:h command-bang):

Special cases                           :command-bang :command-bar
                                        :command-register :command-buffer
There are some special cases as well:

        -bang       The command can take a ! modifier (like :q or :w)

and

Replacement text

The replacement text for a user defined command is scanned for special escape
sequences, using <...> notation.  Escape sequences are replaced with values
from the entered command line, and all other text is copied unchanged.  The
resulting string is executed as an Ex command. [...]

The valid escape sequences are
        [...]
        <bang>  (See the '-bang' attribute) Expands to a ! if the
                command was executed with a ! modifier, otherwise
                expands to nothing.
        [...]

Answer 3

Try that:

:cmap Q! q!

Maps Q! in command mode to q!.