最佳答案
我无法切换当前的 Ruby 版本:
➜ ~ rvm list
rvm rubies
ruby-1.9.2-p290 [ x86_64 ]
ruby-1.9.3-p0 [ x86_64 ]
➜ ~ rvm use ruby-1.9.3-p0
RVM is not a function, selecting rubies with 'rvm use ...' will not work.