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

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# 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](https://docs.brew.sh/Manpage#environment).
If you want to change the defaults of any of those values, you can either set
them directly in your environment:
```bash
$ 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
```