brew_update: Update Homebrew environment and formulae
In briandconnelly/homebrew: Install and Manage Packages using 'Homebrew'

brew_update() fetches the newest version of Homebrew and all formulae

1	brew_update(...)

...

Arguments passed on to brew_cmd

cmd: The command to run (e.g., install)
args: Additional arguments for the command
brew_cmd: Optional: Location of brew command.
echo: Whether to print output and error messages to the screen. Defaults to TRUE for interactive sessions.