Error installing rails - permission denied when running 'gem install rails'

Question

I am new to programming and trying to install Rails on Mac Yosemite v10.10, but I get the following error when running $ gem install rails. How do I avoid this error and install rails?

ERROR: While executing gem ... (Errno::EACCES) Permission denied - /Users/usename/.rbenv/versions/2.0.0-p481/lib/ruby/gems/2.0.0/gems/rails-4.1.7/README.md

I'm using ruby version 2.0.0p481.

Answer 1

You could make this:

sudo chown -R "$USER": ~/.rbenv

This function for me.

Answer 2

Your rbenv installation was incorrectly installed as it had elevated privileges which caused your user account to not have write access to ~/.rbenv.

Do sudo chown -R pgrennin ~/.rbenv. This will take ownership of the directory

Answer 3

If using rbenv

rbenv local 2.0.0-p247 before gem install bundler

more reference : https://github.com/rbenv/rbenv#readme

Answer 4

You probably accidentally installed rails with sudo before. This installed Rails files owned by root and not you, so now you can't update them. To fix this you'll have to repossess those files with chown:

sudo chown -R "$USER" ~/.rbenv

("$USER" is a variable that contains your username)