SleepWatcher

(Note: The official website has a retro design, but the software itself is professional and reliable.)

Current Version: 2.2.1 (compiled in 2008, but remains stable on modern macOS via Rosetta 2 or native recompilation)

Supported Systems: macOS / Mac OS X 10.5 and above

Software Type: Command-line daemon tool

Download: Free download available at the bottom of the official developer website

🌟 Overview

SleepWatcher is a highly creative and powerful command-line daemon that continuously monitors your Mac’s sleep, wake, and user inactivity states. It allows you to trigger custom Unix shell scripts when these system events occur. In essence, it acts as a bridge connecting macOS system events (sleep, wake, idle) with automated actions.

🔧 Core Features & Highlights

1. Full Lifecycle Event Monitoring

• Sleep Detection: Execute specific commands when the Mac or display enters sleep mode.
• Wake Triggering: Automatically run predefined tasks when the Mac wakes from sleep.
• Power State Awareness: For laptop users, trigger different actions when the power adapter is plugged in or unplugged.
• Display Brightness Control: Monitor events such as display dimming, turning off completely, and turning back on.

2. Fine-Grained Idle/Active Management

• --idle option: Trigger commands when the Mac is inactive for a specified duration.
• --active option: Trigger another command when user activity resumes after idleness.
• Ideal for automating power-saving settings, switching work modes, or managing applications requiring state synchronization.

3. Proactive Control Capabilities

• Not only responds to events passively, but also actively triggers the Mac to enter sleep.
• Can query the time elapsed since the last user activity, providing valuable data for complex automation scripts.

4. Lightweight & Low Resource Usage

• Runs as a background daemon with no graphical interface; consumes minimal system resources.
• Operates silently in the background, only "waking up" to execute tasks when predefined events occur.

💎 Key Advantages

1. Highly Automated & Customizable

   • Automate workflows to save time. Examples: pause downloads or disconnect VPN during sleep; open specific apps or sync files on wake; disable power-saving mode when laptop is plugged in.

2. Strong System Integration

   • As a shell command trigger, it leverages the rich Unix tool ecosystem. You can write custom scripts (Bash, Python, AppleScript, etc.) to unlock limitless automation possibilities.

3. Proven Stability Over Time

   • Although version 2.2.1 was released in 2008, its core code remains extremely stable. It runs well on Apple Silicon Macs via Rosetta 2 translation.

4. Ideal for Advanced Users

   • As a command-line tool, it offers precise and flexible control for system administrators, developers, and tech enthusiasts—free from GUI limitations.

5. Open Source

   • Full source code and Makefile are provided, allowing users to compile native versions for new platforms like Apple Silicon, ensuring future compatibility.

⚠️ Notes & Limitations

• Requires Command-Line Knowledge: Designed for advanced users. Configuration and usage require familiarity with terminal commands and basic shell scripting.
• Partial Functionality Limitation: On Apple Silicon Macs (even when running via Rosetta 2), some display-related options (e.g., --displaydim, --displayundim) may not work properly. Developers are actively investigating this issue.
• Older Versions Available: The official site also offers versions compatible with older systems (Mac OS X 10.1 – 10.4) for users with retro computing needs.

📦 Conclusion

SleepWatcher is a powerful automation tool hidden within the command line. While it lacks a flashy interface, its capabilities deeply integrate into your Mac experience. For users who want to boost efficiency and create a personalized workflow via scripting, SleepWatcher is an indispensable utility. Despite its humble appearance, it embodies the Unix philosophy of “connecting everything with scripts”—a core principle of macOS.