rvm install ruby2

~ john$ rvm list known

# MRI Rubies
[ruby-]1.8.6[-p420]
[ruby-]1.8.7[-p371]
[ruby-]1.9.1[-p431]
[ruby-]1.9.2[-p320]
[ruby-]1.9.3-p125
[ruby-]1.9.3-p194
[ruby-]1.9.3-p286
[ruby-]1.9.3-p327
[ruby-]1.9.3-p362
[ruby-]1.9.3-p374
[ruby-]1.9.3-p385
[ruby-]1.9.3-[p392]
[ruby-]1.9.3-head

更新rvm的版本

rvm get stable
rvm autolibs enable
$ rvm list known

# MRI Rubies
[ruby-]1.8.6[-p420]
[ruby-]1.8.7[-p371]
[ruby-]1.9.1[-p431]
[ruby-]1.9.2[-p320]
[ruby-]1.9.3-p125
[ruby-]1.9.3-p194
[ruby-]1.9.3-p286
[ruby-]1.9.3-p327
[ruby-]1.9.3-p362
[ruby-]1.9.3-p374
[ruby-]1.9.3-p385
[ruby-]1.9.3-[p392]
[ruby-]1.9.3-head
[ruby-]2.0.0-rc1
ruby-head

ref: http://stackoverflow.com/questions/15108673/installing-ruby-2-0-0-using-rvm

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