how to install gems without sudo

Question

On all my gem installs I have to do sudo ? So

sudo gem install rails

will work, while only

gem install

Answer 1

MacOS

brew install ruby 

edit ~/.zshrc for zsh (for Bash could be something like ~/.bash_aliases)

# By default, binaries installed by gem will be placed into:
# /usr/local/lib/ruby/gems/2.6.0/bin
export GEM_HOME="/usr/local/lib/ruby/gems/"
export PATH="$GEM_HOME/bin:$PATH"