I, too, would like to run multiple versions of R, via command line, on Mac OS X.
I have looked in vain for a clear explanation of why there can be one and only
one 'Current' version of R running at a time.
After running the installer, I manually edit the
/Library/Frameworks/Versions/<version>/Resources/bin/R script.
Replacing the '/Library/Frameworks/R.framework/Resources' with
'/Library/Frameworks/R.framework/Versions/2.14/Resources'.
Is this sufficient to support multiple versions of R on a Mac?
Thanks,
Peter
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