This example demonstrates a macOS automation script that toggles dark mode based on power source, checking every 60 seconds via a LaunchAgent plist. The Bash script uses `pmset` to detect whether the system draws from battery or AC power, and `defaults` to read the current appearance mode (Dark, Light, or Auto). It saves the original mode to a temporary file before enabling dark mode on battery, then reverts to the saved preference when power returns, using `osascript` to control System Events and display notifications. The code also handles Auto mode by writing the appropriate preference via `defaults write`.