1、检查rvm安装环境
rvm -v
不存在的情况下:-bash: rvm: command not found
2、安装rvm
curl -L https://get.rvm.io | bash -s stable
3、载入rvm环境
source ~/.rvm/scripts/rvm
4、验证
rvm -v
rvm 1.29.12 (latest) by Michal Papis, Piotr Kuczynski, Wayne E. Seguin [https://rvm.io]
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