while true; do
  ydotool mousemove -x 100 -y 100
  ydotool mousemove -x -100 -y -100
  sleep 5m
done

Program documentation first, Arch Wiki second, Gentoo third, surfing the web as a last resort, then ask the forum in the same order. The problem is that there is no universal way to log stuff to so I can't really point out where to look.

Mostly journalctl.

/var/log