[Ruby] How to use rbenv

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This time, I bought Junichi Ito’s introduction to Ruby and started learning.
I had to change the version of Ruby, so I looked into rbenv.

What is rbenv

It is a tool that switches the version of Ruby.
First of all, I would like to install rbenv.

How to install rbenv

Terminal


#Initialization settings
$ echo 'eval "$(rbenv init -)"' >> ~/.bash_profile
#Reflection of initialization settings
$ source ~/.bash_profile
#Install rbenv
$ brew install rbenv ruby-build

Installation is complete here.
The following describes how to install the specified version of Ruby.

How to install the specified version of Ruby

Terminal


#Display a list of installable Ruby versions
$ rbenv install -l
#Install the version of Ruby you want to install from the list
$ rbenv install 2.4.1
#Make the installed version of Ruby available
$ rbenv rehash

If you want to install multiple versions, you can repeat the above.

Folder structure of rbenv

~ / .rbenv / (root folder)
~ / .rbenv / shims / (folder to save wrappers for commands installed by ruby and gem)
~ / .rbenv / version (file that records the globally set Ruby version)
~ / .rbenv / versions / (Folder to install other installed Ruby versions)

Source: What is rbenv-Qiita

Specify the version to use

Terminal


#Switch the version of Ruby used for the entire PC
$ rbenv global 2.4.1
#Check if it was installed
$ ruby -v

Referenced articles

Role of rbenv-Qiita

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