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.
ruby rvm
ruby ×1
rvm ×1