rvm list known #输出以下信息
[ruby-]1.8.6[-p420]
[ruby-]1.8.7[-head] # security released on head
[ruby-]1.9.1[-p431]
[ruby-]1.9.2[-p330]
[ruby-]1.9.3[-p551]
[ruby-]2.0.0[-p648]
[ruby-]2.1[.10]
[ruby-]2.2[.10]
[ruby-]2.3[.8]
[ruby-]2.4[.9]
[ruby-]2.5[.7]
[ruby-]2.6[.5]
[ruby-]2.7[.0]
ruby-head
。。。。
2.安装ruby
rvm install 2.7.0
3.查看已经安装的ruby
rvm list #输出以下信息
=* ruby-2.6.3 [ x86_64 ]
ruby-2.7.0 [ x86_64 ]
# => - current
# =* - current && default
# * - default