[R] new.packages function for new packages

[Ronaldo Reis Jr.]

Hi all,

I use a function update.packages to update all packages in my R instalation.

But I need compare one by one packages to discovery new packages. 

My question is: Exist in R any function that compare all installed packages 
in my R and all packages available in CRAN and return a list of the new 
packages (ie packages that I dont have im my installation) and automatic 
download and install this packages?

Thanks

Ronaldo
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