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If you would like to make one specific Ruby be the default ruby that is selected when you open a new terminal shell, use the --default flag:
$ rvm --default use 1.9.2 $ ruby -v ruby 1.9.2p0 (2010-08-18 revision 29036) [x86_64-darwin10.4.0]
The next time you open a window Ruby 1.9.2 will be the selected ruby.
To switch back to your system ruby:
$ rvm use system $ ruby -v ruby 1.8.7 (2009-06-12 patchlevel 174) [universal-darwin10.0]
To switch at any time to the ruby you have selected as default:
$ rvm default $ ruby -v ruby 1.9.2p0 (2010-08-18 revision 29036) [x86_64-darwin10.4.0]
To show what ruby is currently the selected default, if any, do:
$ rvm list default Default Ruby (for new shells) ruby-1.9.2-p0 [ x86_64 ]
If you wish to switch back to your system ruby as default, remember that RVM does not "manage" the system ruby and is "hands off".
This means to set the "system" ruby as default, you reset RVM's defaults as follows.
$ rvm reset
Note that "default" is merely implemented as an alias with an especially significant name.
If you encounter an error such as "RVM is not a function, selecting rubies with 'rvm use ...' will not work.", try using the alias action instead:
$ rvm alias create default 1.9.2