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

[Simon Urbanek]

On Oct 11, 2011, at 6:24 AM, Marius Hofert wrote:

> 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'
> 

Try

ln -sfn 2.13 /Library/Frameworks/R.framework/Versions/Current

You'll need to be admin of the computer, otherwise you'll need sudo or change permissions. Note that for symlinks you'll need extra -h in chown otherwise you're changing ownership of the target not the link. If in doubt (ie., you messed with permissions before), run sudo chmod g+w -R /Library/Frameworks/R.framework

Cheers,
Simon


> 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.
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