How do I write a function `x' to replace builtin command `x', but still invoke the command from within the function?

How do I write a function `x' to replace builtin command `x', but still invoke the command from within the function? 


This is why the `command' and `builtin' builtins exist.  The

`command' builtin executes the command supplied as its first

argument, skipping over any function defined with that name.  The

`builtin' builtin executes the builtin command given as its first

argument directly. 



For example, to write a function to replace `cd' that writes the

hostname and current directory to an xterm title bar, use

something like the following:



	cd()

	{

		builtin cd "$@" && xtitle "$HOST: $PWD"

	}



This could also be written using `command' instead of `builtin';

the version above is marginally more efficient.

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