Here are some useful commands.
brew install gcc -- Install some package, e.g., gcc brew uninstall gcc -- Uninstall a package brew info gcc -- Check package information brew list -- List all installed packages brew update -- Update package list (needs internet connection) brew outdated -- See outdated packages brew upgrade -- Upgrade all outdated packages brew upgrade gcc -- Upgrade a specific package brew cleanup -- Remove old versions of packages brew deps gcc -- Check dependencies for gcc brew uses --installed gcc -- Check which installed packages depend on gcc brew leaves -- List packages not required by any installed package