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Before you can use a gemset, you must first create it.
$ rvm 2.1.1 $ rvm gemset create teddy
To use a gemset
$ rvm gemset use teddy
To stop using the custom gemset (and switch to the default one) use one of the following:
$ rvm gemset use default # OR: $ rvm use @default
You can switch to a gemset as you start to use a ruby, by appending @gemsetname to the end of the ruby selector string:
$ rvm use 2.1.1@teddy
You can also specify a *default* gemset for a given ruby interpreter, by doing:
$ rvm use 2.1.1@teddy --default
To use a named gemset with an RVM 'do' action, append it to the ruby selector string using a '@'
rvm 2.1.1@teddy,ree@teddy,jruby@teddy do rake test
If you are aware of where you are at, and wish to fix the gemset, you can do:
rvm gemset use teddy rvm 2.1.1,ree,jruby do rake --sticky test
If you would like to create gemsets automatically when used, export this flag in your ~/.rvmrc file:
rvm_gemset_create_on_use_flag=1