如何在 MacOS 上使用 rbenv 设置 Ruby 的版本？

Question

I was trying to follow the book "Agile Web Development with Rails 5.1" (on MacOS).

I want ruby -v to be 2.4.1 .

Currently, ruby -v says ruby 2.6.5p114 (2019-10-01 revision 67812) [x86_64-darwin19] .

I want to use rbenv to manage the version of Ruby installed. So I tried rbenv install 2.4.1 then rbenv global 2.4.1 . But that still did not change the output of ruby -v . What more do I have to do?

I see that which ruby returns ~/.rubies/ruby-2.6.5/bin/ruby . I can't remember how I installed that version of Ruby - it might have been homebrew.

Answer 1

Okay so

brew install rbenv
echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.bashrc
echo 'eval "$(rbenv init -)"' >> ~/.bashrc
source ~/.bashrc
echo 'source ~/.bashrc' >> ~/.bash_profile
rbenv install 2.4.1
rbenv global 2.4.1
rbenv rehash # This is probably what you didn't do, start a new terminal or use rehash

Then try ruby -v and which ruby

You can skip some of the beginning steps in case you have rbenv setup and everything.

Answer 2

I ended up using RVM instead. I'm not sure but I might have had multiple ruby version managers installed when I asked the question.