On Debian with the GNOME desktop environment, the command equivalent to clicking the "Quit" button in a program window (which typically closes the window but does not forcefully kill the program) is:

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xdotool getactivewindow windowkill

However, this requires xdotool to be installed. If you want a more native approach, you can use:

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wmctrl -c :ACTIVE:

This sends a "close window" request to the active window, allowing the program to handle the shutdown gracefully (e.g., prompting to save files if needed).

Steps to Use:

1. Install wmctrl (if not already installed):

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   sudo apt install wmctrl

2. Run the command above to close the active window.

This mimics the behavior of clicking the "X" button or selecting "Quit" from the menu, rather than forcefully terminating the process.