To run a script each time a new GNOME window opens on Debian, you can use a combination of GNOME's built-in tools and scripting. Here’s a step-by-step approach:

1. Use xdotool and wmctrl

These tools allow you to detect and interact with windows.

• Install the tools:

  bash
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  sudo apt update
  sudo apt install xdotool wmctrl
  

• Create a script (e.g., ~/window_script.sh) that runs your desired actions when a new window opens. For example:

  bash
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  #!/bin/bash
  # Your script logic here
  echo "New window opened: $(wmctrl -l -p | tail -n 1)" >> ~/window_log.txt
  

• Make the script executable:

  bash
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  chmod +x ~/window_script.sh
  

2. Detect New Windows

Use a loop with wmctrl to monitor for new windows:

bash
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#!/bin/bash
while true; do
    wmctrl -l
    sleep 1
done | while read -r line; do
    # Check if the window is new (you may need to track previous windows)
    ~/window_script.sh
done

3. Run the Monitor Script at Startup

• Save the monitor script (e.g., ~/window_monitor.sh) and make it executable:

  bash
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  chmod +x ~/window_monitor.sh
  

• Add it to your GNOME startup applications:
  • Open Startup Applications from the GNOME menu.
  • Add a new entry pointing to ~/window_monitor.sh.

4. Alternative: Use GNOME Extensions

If you prefer a GUI-based approach:

• Install the GNOME Shell Extension "Window List" or similar.
• Use extensions like "Run on Window Open" (if available) to trigger scripts.

5. Debugging

• Check logs (~/window_log.txt) to ensure the script runs as expected.
• Adjust the sleep interval in the monitor script for performance.

Note: This approach is not foolproof—it polls for new windows rather than using event-driven triggers. For a more robust solution, consider using a window manager hook or a dedicated tool like devilspie2.

Would you like help refining the script for a specific use case?