centos ruby经过rvm更新版本

curl -sSL https://get.rvm.io | bash

/usr/local/rvm/bin/rvm install 1.9.3

vim /etc/profile

添加一行

[[ -s "$HOME/.rvm/scripts/rvm" ]] && . "$HOME/.rvm/scripts/rvm"

source /etc/profile

type rvm | head -1

 rvm use 1.9.3

ruby -v