No matter how much Google ask to install "Gemini CLI: your open-source AI agent" for your terminal on macOS, Linux, Unix or other oses, do not install it. Here is a snippet from their policy:

Google collects your prompts, related code, generated output, code edits, related feature usage information, and your feedback to provide, improve, and develop Google products and services and ML technologies.

All your data on disk will be the part of AI training which is privacy nightmare