How to install a Ruby Gem without Root on a Mac
Gems are little packaged Ruby applications that allow you to extend the ecosystem and reuse countless online sources. If you don’t have Root on your Mac (work at a large company?) but you still want to use a Gem or two, then you will usually get the following error when attempting to install: ERROR: While executing gem ... (Gem::FilePermissionError) You don't have write permissions for the /Library/Ruby/Gems/2.0.0 directory. This is incredible annoying, but something you can’t avoid....