Checking MacTeX version installed on a Mac

MacTeX installs a System Preferences pane which shows TeX installations for selection. There you can see the version.

Here's a screenshot:

enter image description here

; readlink /usr/texbin
../usr/local/texlive/2010/bin/x86_64-darwin

In 2010, this worked:

cd /usr/texbin && pwd -P

and gave something like /usr/local/texlive/2009/bin/universal-darwin.

For more recent versions, use

cd /Library/TeX/Root && pwd -P

which gives something like /usr/local/texlive/2018.

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