Which ruby version manager is most used nowadays?
Two different ruby versions on mac? - Stack Overflow
macos - Using Homebrew vs a ruby version manager on OS X? - Stack Overflow
How to install Ruby with RVM (Ruby version manager) on Ubuntu Linux!
Just https://github.com/rbenv/rbenv
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Do you guys know which version manager for Ruby is the go-to nowadays? Is anything known about how it is done at bigger companies like Shopify and 37signals?
I stumbled upon this comparison on github and there seem to be quite a few.
https://github.com/rbenv/rbenv/wiki/Comparison-of-version-managers
There are to different versions because Mac OSX already includes one by default for system scripts (2.6). Homebrew install another one that never overrides o reemplace the System Wide version.
You are looking for a "Ruby Version Manager", are tools that allow you to install and use different versions of Ruby, even per project.
The popular ones are RVM and rbenv. Personally, i choose rbenv and I think that is the most widely used of both. Example of use:
# Install ruby 2.7
rbenv install 2.7.1
# Make ruby 2.7 the default version
$ rbenv global 2.7.1
# Or make 2.7 the default versión only on a specific project
$ cd myproject
$ rbenv local 2.7.1
# this create a ".ruby-version" file
This webpage always have the most recent and easy to use tutorial for setup a Ruby environment, depending on the OS and version.
https://gorails.com/setup/osx/10.15-catalina#overview
You have two different versions of Ruby installed, because MacOS natively comes with a standard installation of Ruby.
You also have rails pointing to the system version of Ruby. That version is usually under /usr/bin/ruby. The Homebrew installed version of Ruby (which is what you want) is located under /usr/local/bin/ruby unless you specified a completely different root path to install your brew packages.
Running brew config will give you a short list of data about your Homebrew configuration. Among them is an environment variable called HOMEBREW_PREFIX, which should look something like this:
$ brew config
....
HOMEBREW_PREFIX: /usr/local
....
I recommend placing /usr/local/bin first on your PATH environment variable so that you can easily use your brew packages via the CLI:
export PATH="/usr/local/bin:$PATH"
You may also want to look into setting the following environment variables for whichever shell you are using (examples given):
RUBY_ENGINE=rubyRUBY_VERSION=2.7.1GEM_ROOT=/usr/local/etc/ruby-2.7.1/lib/ruby/gems/2.7.1(alias forGEM_HOME)
gem env gives a lot of great information on how Gems is configured.
Don't mess w/your system Ruby, your system needs to be stable and it's not necessary.
Homebrew isn't made to manage multiple versions of software. RVM (and others) and made to do exactly that. I currently have 6 rubies installed. I'd hate to have to manage that manually. RVM (or friends) is the way to go if you are installing Ruby on your host. People often go to the next level and use Vagrant instances to further isolate their development environment.
IMHO the most important reason to use a version manager is to be able to run multiple different versions of Ruby on the same machine e.g. to test gems with different versions or to run several (legacy and new) applications on the same development computer. Rbenv or RVM makes this easy, Homebrew doesn't support this...