[R] lint for R? and debugging

[Esmail]

Good morning .. sorry if this is a basic question, but is there
a lint-like utility for R to check for suspicious language
constructs?

And along the same lines, any type of interactive debugging
utility for R?

My main use of R is under Linux (though I run code sometimes
under Window XP). R versions 2.9-2.10

Thanks,
Esmail