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What's the default Ruby version on OSX Mountain Lion ? Still 1.8.x or 1.9.x ?
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First of all, Ruby is already pre-installed on your Mac. However, the pre-installed version is a few versions behind so we'll look into the other ways to install Ruby. Using a package management system makes your life easier when installing any software. On a Mac, you can use Homebrew to install newer versions of Ruby.
Set Ruby version with rvm on Mac 0 on the command line. To switch to the system ruby, enter rvm use system . To switch back to the default, rvm default . The command rvm list will show all installed Rubies, including the current and default versions.
On Mountain Lion, it is Ruby 1.8.7-p358 (Tested with OS X 10.8 and 10.8.3):
$ sw_vers
ProductName: Mac OS X
ProductVersion: 10.8.3
BuildVersion: 12D78
$ /usr/bin/ruby -v
ruby 1.8.7 (2012-02-08 patchlevel 358) [universal-darwin12.0]
On OS X 10.9.5, ruby is now 2.0!
$ sw_vers
ProductName: Mac OS X
ProductVersion: 10.9.5
BuildVersion: 13F34
$ /usr/bin/ruby --version
ruby 2.0.0p481 (2014-05-08 revision 45883) [universal.x86_64-darwin13]
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