Desktop gs$ rvm install 2.5
Unknown ruby string (do not know how to handle): ruby-2.5.
Unknown ruby string (do not know how to handle): ruby-2.5.
Searching for binary rubies, this might take some time.
No binary rubies available for: osx/10.9/x86_64/ruby-2.5.
Continuing with compilation. Please read 'rvm help mount' to get more information on binary rubies.
Checking requirements for osx.
Installing requirements for osx.
Updating system........

没有 2.5 就没有吧，你 updating 我的 system 干嘛？莫非是要把我的 osx 10.9.5 给升级到最新版本？吓得我赶紧按 ctrl + C 退出来了