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When you delete a gemset, rvm will prompt you to confirm the deletion.

$ rvm gemset use teddy
$ rvm gemset delete teddy

To skip confirmation, pass the --force flag:

$ rvm gemset use teddy
$ rvm --force gemset delete teddy

By default, rvm deletes gemsets from the currently selected Ruby interpreter. To delete a gemset from a different interpreter, say 2.0.0, run your command this way:

$ rvm 2.0.0 do rvm gemset delete teddy