Manage multiple versions of Ruby on Mac [macOS + rbenv]

Introduction

I had never touched Ruby, so I decided to try it again and built a Ruby environment on my Mac. Ruby is installed as standard on Mac, but the version is old, so if you install the latest version anyway, it is the same as PHP's phpenv I thought that it would be easier to switch between multiple versions of Ruby by inserting rbenv, so I wrote this article.

environment

• MacBook Pro 13 - macOS Mojave 10.14.6

• In this procedure, it is assumed that Homebrew is installed in advance because the brew command is used.

Purpose

Manage multiple versions of Ruby on your Mac and switch between them so you can use them. (The version is different for each project)

rbenv installation procedure

First, Homebrew update

$ brew update

Then install rbenv

$ brew install rbenv
...
Error: Permission denied @ apply2files - /usr/local/lib/node_modules/cordova/node_modules/extglob/lib/.DS_Store

I got a permission error in my environment, but Ignore it because it's from .DS_Store

Finally check the version of rbenv

$ rbenv --version
rbenv 1.1.2-11-gc46a970

This completes the installation! It's too easy to beat. I only remember that it was more troublesome when I introduced PHP's phpenv. .. ..

bonus

You can get help by running the rbenv command with no arguments, but just in case.

$ rbenv
Usage: rbenv <command> [<args>]

Some useful rbenv commands are:
   commands    List all available rbenv commands
   local       Set or show the local application-specific Ruby version
   global      Set or show the global Ruby version
   shell       Set or show the shell-specific Ruby version
   install     Install a Ruby version using ruby-build
   uninstall   Uninstall a specific Ruby version
   rehash      Rehash rbenv shims (run this after installing executables)
   version     Show the current Ruby version and its origin
   versions    List installed Ruby versions
   which       Display the full path to an executable
   whence      List all Ruby versions that contain the given executable

See `rbenv help <command>' for information on a specific command.
For full documentation, see: https://github.com/rbenv/rbenv#readme

• Check the installable Ruby version

$ rbenv install --list-all
1.8.5-p52
1.8.5-p113
1.8.5-p114
...

• Install the specified version of Ruby

$ rbenv install 2.7.1
Downloading ruby-2.7.1.tar.bz2...
-> https://cache.ruby-lang.org/pub/ruby/2.7/ruby-2.7.1.tar.bz2
Installing ruby-2.7.1...
ruby-build: using readline from homebrew
Installed ruby-2.7.1 to /Users/XXXXX/.rbenv/versions/2.7.1

• Check the installed Ruby version

$ rbenv versions
* system (set by /Users/XXXXX/.rbenv/version)
  2.7.1

* System is Ruby originally installed on Mac

• Check the Ruby version you are currently using

$ rbenv version
system (set by /Users/XXXXX/.rbenv/version)

• Specify the version of Ruby to be used under the current directory

$ rbenv local 2.7.1

• Specify the Ruby version used for the entire system

$ruby global 2.7.1

Various commands and the operation of each command are the same as phpenv. So if you have used phpenv, you may be able to use it without any discomfort.