Cannot run R from terminal after upgrading to macOS Sierra - r

Question

I recently updated my macbook to macOS Sierra (Version 10.12.3 (16D32)), and I am no longer able to run R directly from Terminal:
DN51ssqi:~ kjytay$ R
-bash: R: command not found
DN51ssqi:~ kjytay$ R --version
-bash: R: command not found
Opening R from the Applications folder or from RStudio works fine. Anyone experience this issue/has been able to fix it?
Here is my R version information:
platform x86_64-apple-darwin13.4.0
arch x86_64
os darwin13.4.0
system x86_64, darwin13.4.0
status
major 3
minor 3.2
year 2016
month 10
day 31
svn rev 71607
language R
version.string R version 3.3.2 (2016-10-31)
nickname Sincere Pumpkin Patch

Answer 1

This is just a guess, but I'm thinking this is probably an issue with your PATH settings, which might have been overwritten when you upgraded*. Seems worth a try at least. This is from the RStudio support pages**:
R from source (including MacPorts and Homebrew)
When R is installed from CRAN on OS X the R executable is installed at
/usr/bin/R. However, if R is installed directly from source or via a
package manager like MacPorts or Homebrew, then the R executable is
installed to either /usr/local/bin/R (Homebrew) or /opt/local/bin/R
(MacPorts). In order to support these variations, RStudio scans for
the R executable in the following sequence:
/usr/bin/R
/usr/local/bin/R
/opt/local/bin/R
If RStudio is not able to locate R by scanning these locations, it
will fall back to using whatever version of R is located at
/Library/Frameworks/R.framework/.
If RStudio is finding R OK, then you must have it at one of these locations. Make sure these locations are in your $PATH list:
In the Terminal:
echo $PATH
Will display your current PATHs list. If any of the locations in the RStudio quote are missing, you can see if that's where R is located by trying to specify that location. For example:
/usr/local/bin/R
If that works to start R, just add that location to your PATHs list:
export PATH=$PATH:/usr/local/bin
So that OSX knows where to find it!
* It's been noted elsewhere that homebrew breaks, for example, on upgrade to Sierra. Here's a blog post outlining some steps an R user might like to take after the upgrade: http://www.statsblogs.com/2017/01/26/upgrading-to-macos-sierra-nee-osx-for-r-users/
** Here's the support page where the quote is from https://support.rstudio.com/hc/en-us/articles/200486138-Using-Different-Versions-of-R