Unattended updates for the modern Mac user.

stay-updated.sh

#!/bin/bash
###
# Unattended updates for the modern Mac user.
#
# It is recommended to enable App Management for your terminal application.
#
# Go to System Settings > Privacy & Security > App Management and add or enable your terminal.
###

# Update packages managed by brew
brew update && brew upgrade

# Install all available updates App Store, including macOS system updates
# NOTE: A system restart may be required here. Run this script again after restarting.
sudo softwareupdate --install --all --agree-to-license

# Reboot to apply any further updates
sudo shutdown -r +1

I use ZSH and have this alias in my .zshconfig:

alias brewupdate="cd ~ && brew update && brew upgrade && brew cleanup && nvm install 'lts/\*' --reinstall-packages-from=current && npm update -g && omz update"