//Although it is written in the rbenv head family, it needs to be initialized. Bash to finish at login_Write in profile
$ echo 'eval "$(rbenv init -)"' >> ~/.bash_profile

//When you install rbenv, ruby-I think build was installed by dependency resolution, but I specified it just in case
$ brew install rbenv ruby-build

//List of installable versions
$ rbenv install -l
2.5.8
2.6.6
2.7.1
jruby-9.2.11.1
maglev-1.0.0
mruby-2.1.0
rbx-4.15
truffleruby-20.1.0

// install
$ rbenv install 2.7.1

//At this time, ruby's PATH via rbenv refers to the previous one. So the version at this point is 2.6.3
$ rbenv which ruby
/usr/bin/ruby

//Those who are not rbenv ruby are looking at rbenv ruby properly
$ which ruby
/Users/your_account/.rbenv/shims/ruby

//When reflecting in local (current directory)
$ rbenv local 2.7.1

//Reflected in shims
$ rbenv rehash

$ rbenv which ruby
/Users/your_account/.rbenv/versions/2.7.1/bin/ruby

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