[R] command completion?

[Robert Citek]

Does R have command or object name completion?

R has several functions of modern shells built into it e.g. history  
mechanism, command-line editing, emacs key bindings.  However, it  
doesn't seem to have command or object name completion.  For example,  
in bash I can begin typing a command and then press the tab key to  
have the shell fill in the rest of the command (works for environment  
variables and filenames, too).  Does command completion exist and I'm  
not using it correctly or don't have it turned on, or is it really  
not there?

Regards,
- Robert
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