[R-SIG-Mac] Multiple R versions: set Current via symbolic link: permissions?

[Marius Hofert]

Hi,

I have multiple R versions installed and would like to switch between them via setting the symblic link "Current". To make this a bit more convenient, I defined two "aliases" in .bashrc:

alias R2.13='d=/Library/Frameworks/R.framework/Versions; rm $d/Current; ln -s $d/2.13 $d/Current'
alias R2.14='d=/Library/Frameworks/R.framework/Versions; rm $d/Current; ln -s $d/2.14 $d/Current'

On executing R2.13 in the terminal, I get:
rm: /Library/Frameworks/R.framework/Versions/Current: Permission denied
ln: /Library/Frameworks/R.framework/Versions/Current/2.13: Permission denied

If I chown Current, I still get:
rm: /Library/Frameworks/R.framework/Versions/Current: Permission denied

I (bad) solution is to put in "sudo" in the alias... 

How is it done correctly? 

Cheers,

Marius

PS: I also posted it for future reference, I've only found the idea of using ln -s on the help pages/FAQ, but not how to get around the permission issue.