Fix Ruby Gems Permission Error
The Problem
When install gem in Mac OS X Yosemite, I got the following error:
ERROR: While executing gem … (Gem::FilePermissionError) You don’t have write permissions for the /Library/Ruby/Gems/2.0.0 directory.
The Solution
Step 1: Install Rbenv
brew install rbenv ruby-build
echo ‘export PATH=”$HOME/.rbenv/bin:$PATH”’ » ~/.zshrc
echo ‘eval “$(rbenv init -)”’ » ~/.zshrc
Note: Modify your ~/.bash_profile instead of ~/.zshrc file if you’re not using zsh.
Step 2: Close your terminal and restart the shell
Step 3: Install Ruby, Set globle and Rehash
rbenv install 2.0.0-p247
rbenv global 2.0.0-p247
rbenv rehash
Step 4: gem install as usual
Now you should get the gem successfully installed!

About
Experience in software development, application architecture, and deploying cloud solutions for enterprise customers. Strong hands-on skills with a Master's degree in Computer Science and business acumen with a master of business administration (MBA) in Finance. Certified in Amazon Web Services (AWS), Google Cloud Platform (GCP), Microsoft Azure, Kubernetes (CKA, CKAD, CKS, KCNA) and Scrum (PSM, PSPO) with experience in building banking products from scratch.