til/brew/configure-brew-environment-variables.md

Configure Brew Environment Variables

The brew CLI can be configured with a ton of different environment variables. A full listing of those can be found in the Environment section of their docs.

If you want to change the defaults of any of those values, you can either set them directly in your environment:

$ set HOMEBREW_BAT=1

Or you can set them in a more dedicated place like one of Homebrew's environment files. There are a couple possible locations for these files. I prefer to use $HOME/.homebrew/brew.env (i.e. ~/.homebrew/brew.env).

HOMEBREW_BAT=1

This file and directly likely don't exist, so you may have to set them up the first time:

$ mkdir $HOME/.homebrew
$ touch $HOME/.homebrew/brew.env