What This Script Does
The brew_setup_tahoe.sh script is the flagship entry point for the entire Brew Scripts toolkit. It provides a complete, end-to-end Homebrew installation and configuration experience that is designed to be both thorough and approachable, even for users who have never opened Terminal before. Rather than making assumptions about what you need, it walks you through every step interactively and lets you decide what to install, what to skip, and how to configure your system.
When you launch the script, the first thing it does is detect your Mac's processor architecture. This matters because Apple Silicon Macs (M1, M2, M3, M4, and later) use a different Homebrew installation path than older Intel-based Macs. On Apple Silicon, Homebrew installs to /opt/homebrew, while Intel Macs use /usr/local. The script handles this distinction automatically, ensuring that all subsequent PATH configurations and package installations point to the correct location for your hardware.
Next, the script checks whether Homebrew is already installed. If it is, the script validates the installation and moves on. If Homebrew is not present, the script downloads and runs the official Homebrew installer. It also checks for and installs the Xcode Command Line Tools if they are not already available, since many Homebrew packages depend on these tools for compilation.
Once Homebrew is ready, the script configures your shell environment by adding the appropriate Homebrew PATH entries to your shell profile. It detects whether you are using zsh (the default on modern macOS) or bash, and edits the corresponding configuration file — ~/.zshrc or ~/.bash_profile. This ensures that the brew command is available every time you open a new terminal window.
The interactive app installation phase is where the script truly shines. It reads your configuration file to determine which categories of applications you want to install — development tools, productivity apps, creative software, communication tools, and utilities. For each category, the script presents you with the list of apps and asks for confirmation before proceeding. You can accept the entire category, skip it entirely, or install apps one at a time. This level of control means you never install anything you did not explicitly approve.
Throughout the entire process, the script writes detailed logs to a file at ~/Library/Logs/HomebrewSetup.log. Every action, every success, and every error is recorded with timestamps and severity levels. If something goes wrong, the log file is your first resource for diagnosing the issue. The script also supports a --debug flag that produces even more verbose output for advanced troubleshooting scenarios.
Perhaps the most important safety feature is --dry-run mode. When you pass this flag, the script simulates the entire setup process without actually making any changes to your system. It shows you exactly what would happen — which packages would be installed, which files would be modified, and which system checks would pass or fail — without touching anything. This is strongly recommended for your first run so you can verify that everything looks correct before committing.