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Two other building blocks seem to be



xscreensaver-command -watch


and the following perl program, which tracks the output of the -watch command
and reacts accordingly:

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Thanks for your responses, klaus2008.

nmcli is probably part of the solution; I'll study up on that.

I should have indicated keyboard and/or mouse events as an indication or
lack of user...

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I would like to create a small bash program that would
monitor my keystroke activity and if no keystrokes are noted
within a fixed small time, then any currently active
internet connection...