How to install a gem or update RubyGems if it fails with a permissions error

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I’m trying to install a gem using gem install mygem or update RubyGems using gem update --system, and it fails with this error:

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

Does anyone have an idea how to solve this?

30 s
30

Try adding --user-install instead of using sudo:

gem install mygem --user-install

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