MacOS - takes a repeated screenshot of area and clicks a location between screenshots.

repeated-screenshot.sh

#!/bin/bash
ITERATION=0
while :
do
  screencapture -R 1,1,100,100 -x screenshot-$ITERATION.png
  # Get the coordinates for -R using command - shift - 4. First 2 numbers when at one corner then last 2 numbers when dragging over area
  ITERATION=$(($ITERATION+1))
  echo "picture $ITERATION taken"
  osascript -e 'tell application "System Events"
  click at {1,100}
end tell'
  # Use cmd-shift-4 to get exact location
  sleep 1
done
# NOTE: will run forever, so don't leave sitting forever!