指定当前ruby项目的ruby版本

mkdir  first_ruby_project

cd first_ruby_projiect

touch .ruby-version

vim .ruby-version

新建一个rails项目

rails new project_name  //例如 rails new blog

https://blog.csdn.net/caib1109/article/details/51713082

http://railstutorial-china.org/book/chapter1.html

http://railstutorial-china.org/book/chapter2.html

https://blog.csdn.net/noob_cherry/article/details/80690784