overriding builtin command and command history

First, I'd like to override an existing built-in command.
I have found discussion about using 'cabbrev' to do this
such as:

cabbrev cp <c-r>=(getcmdtype()==':' && getcmdpos()==1 ? 'call
g:UserUp()' : 'cp')<CR>

If there is a different way that is "recommended", I'd
like to know.

Second, with this approach, the "call" is placed in to the
command line history. Is there a way to prevent adding
the call to the command history? The end-user does not
really need to do the "call" via the history mechanism.
Even better would be to place "cp" in the command history
rather than the "call".

Thanks

Richard

--
Quis custodiet ipsos custodes

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