How do I install ruby gems on Mac

How do I install RubyGems on my Mac?

I tried to run $ gem install rubygems-update with no luck . It returns

ERROR: While executing gem ... (Gem::FilePermissionError) You don't have write permissions for the /Library/Ruby/Gems/2.0.0 directory. 

Any help would be great. Thanks

5 Answers

I would highly suggest using a package manager and a Ruby Environment Manager.

On Mac:

brew update brew install ruby # If you use bash echo 'export PATH=/usr/local/Cellar/ruby/2.4.1_1/bin:$PATH' >> ~/.bash_profile # If you use ZSH: echo 'export PATH=/usr/local/Cellar/ruby/2.4.1_1/bin:$PATH' >> ~/.zprofile 

You can do that but I suggest using an Environment Manager for Ruby. You have rbenv and RVM.
IMO go for rbenv:

brew install rbenv ruby-build # bash echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.bash_profile echo 'eval "$(rbenv init -)"' >> ~/.bash_profile # zsh echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.zprofile echo 'eval "$(rbenv init -)"' >> ~/.zprofile # list all available versions: rbenv install -l # install a Ruby version: rbenv install 2.4.1 # set ruby version for a specific dir rbenv local 2.4.1 # set ruby version globally rbenv global 2.4.1 rbenv rehash gem update --system 

One more variant is to use brew-gem.

Just copy/paste from the documentation:

brew install brew-gem

Usage

brew gem install heroku

To install a specific version: brew gem install heroku 3.8.3

To install using a brew installed ruby(/usr/local/bin/ruby): brew gem install heroku --homebrew-ruby

And with a specific version: brew gem install heroku 3.8.3 --homebrew-ruby

To upgrade: brew gem upgrade heroku

To uninstall: brew gem uninstall heroku

To check information: brew gem info heroku

Note: Installed gems are listed in brew list with prefix of gem-, like gem-heroku.

After installing cocoapods as Tulon suggested the thing which worked for me was passing the --user-install flag to the gem install command e.g

gem install rubygems-update --user-install

from

You may have to install manually in which case (as per the official website):

1. Go to the official website and download the zip file
2. Unzip the file in a directory.
3. Then go to the directory in your terminal and run: ruby setup.rb

It is showing that you don't have the permission to write something in that directory. Instead use this directory :

sudo gem install -n /usr/local/bin cocoapods

It perfectly work for me.

(I am using macOS Sierra, version 10.12.6)