How to use Homebrew on a Multi-user MacOS Sierra Setup

You can also change the group permissions to admin or another group that both of your users are in:

chgrp -R admin /usr/local
chmod -R g+w /usr/local

Original source: https://gist.github.com/jaibeee/9a4ea6aa9d428bc77925

UPDATE:

In macOS High Sierra you can’t change the owner, group or permissions of /usr/local. So you have to change the group and permissions of the subfolders:

chgrp -R admin /usr/local/*
chmod -R g+w /usr/local/*

UPDATE September 2018, High Sierra 10.13.6

1. Determine the path of the brew prefix, ie. the path that will be used to store files related to working with homebrew
2. Check that all users on the system who need access to brew are in the admin group
3. Optional Add a user to the admin group if a user needs access to brew
   

   Will require access / privileges to use the sudo command

4. Set the brew prefix path to be recursively owned by the admin group
5. Set the brew prefix path to be recursively writable by all users who are in the admin group
6. Verify the permissions of the brew prefix
7. brew 🍻

echo $(brew --prefix)
echo $(groups $(whoami))
sudo dseditgroup -o edit -a $(whoami) -t user admin
sudo chgrp -R admin $(brew --prefix) 
sudo chmod -R g+rwX $(brew --prefix)
ls -lah $(brew --prefix)