Remove all packages that do not come with R

Question

How can I remove all installed packages except base and recommended?

Answer 1

Be CAREFUL! And read the docs before you try this:

# Pasted as a commented to prevent blindly copying and pasting # remove.packages( installed.packages( priority = "NA" )[,1] ) 

By default this will remove packages from the first library in your .libPaths().

Answer 2

Instead of

Updated to R 3.0.0 and have to rebuild all packages.

just do

update.packages(..., checkBuilt=TRUE) 

which is what I did on my R 3.0.0 (using lib.loc=... to point to my different local directories). This will update everything you have and which it can still get from repos such as CRAN. For install_git() etc, you are out of luck and need to reinstall.

But either way you do not need to remove the packages first.