Enable homebrew for non admin users

Even on OSX you should not be working with an admin account. Here are the steps to make homebrew usable for non admin users.

Assumptions

I assume brew has already been installed by an administrator and it's login is admin. Change admin below to the name of your admin account.

Steps

Under System Preferences create a new group "brew" and add your user to it. Then open the terminal and:

su - admin
sudo chgrp -R brew /usr/local
sudo chgrp -R brew /Library/Caches/Homebrew
sudo chmod -R g+w /usr/local
sudo chmod -R g+w /Library/Caches/Homebrew

# and if you plan to use caskroom too:
sudo mkdir -p /opt/homebrew-cask/Caskroom
sudo chgrp -R brew /opt/homebrew-cask
sudo chmod -R g+w /opt/homebrew-cask

(this logs in as the admin user and allows the members of the "brew" group to write to /usr/local and the Caches directory)

With your user account you can now run brew doctor to check if everything is working as it should.

Credits: Visit this for some more detailed instructions.