diff --git a/xjiggler/xjiggler b/xjiggler/xjiggler
new file mode 100755
index 0000000..0df1023
--- /dev/null
+++ b/xjiggler/xjiggler
@@ -0,0 +1,79 @@
+#!/bin/sh
+set -e
+
+# based on https://github.com/carrot69/keep-presence/
+
+test -n "$XJIGGLER_ACTION_DELAY" \
+	|| XJIGGLER_ACTION_DELAY=300	# seconds
+test -n "$XJIGGLER_DETECTION_DELAY" \
+	|| XJIGGLER_DETECTION_DELAY=60	# seconds
+test -n "$XJIGGLER_MOUSE_DISTANCE" \
+	|| XJIGGLER_MOUSE_DISTANCE=1	# pixels
+
+# eval is scary but this use was mentioned in the man page
+getmouselocation(){
+	eval $(xdotool getmouselocation --shell | sed 's/^/XJIGGLER_/g')
+	XJIGGLER_T="$(date '+%s')"
+}
+
+jiggle(){
+	case "$XJIGGLER_mousedirection" in
+	up)	xdotool mousemove_relative 0 -"$XJIGGLER_MOUSE_DISTANCE"
+		return	;;
+	right)	xdotool mousemove_relative "$XJIGGLER_MOUSE_DISTANCE" 0
+		return	;;
+	down)	xdotool mousemove_relative 0 "$XJIGGLER_MOUSE_DISTANCE"
+		return	;;
+	left)	xdotool mousemove_relative -"$XJIGGLER_MOUSE_DISTANCE" 0
+		return	;;
+	*)
+		false	;;
+	esac
+}
+
+pushmouselocation(){
+	XJIGGLER_lastT="$XJIGGLER_T"
+	XJIGGLER_lastX="$XJIGGLER_X"
+	XJIGGLER_lastY="$XJIGGLER_Y"
+}
+
+printdebug(){
+	printf "XJIGGLER_T=%s\n" "$XJIGGLER_T"	# seconds since epoch
+	printf "XJIGGLER_X=%s\n" "$XJIGGLER_X"	# pixels
+	printf "XJIGGLER_Y=%s\n" "$XJIGGLER_Y"	# pixels
+	printf "XJIGGLER_lastT=%s\n" "$XJIGGLER_lastT"
+	printf "XJIGGLER_lastX=%s\n" "$XJIGGLER_lastX"
+	printf "XJIGGLER_lastY=%s\n" "$XJIGGLER_lastY"
+}
+
+rotatemousedirection(){
+	case "$XJIGGLER_mousedirection" in
+	up)	XJIGGLER_mousedirection=right;	return; ;;
+	right)	XJIGGLER_mousedirection=down;	return;	;;
+	down)	XJIGGLER_mousedirection=left;	return;	;;
+	*)	XJIGGLER_mousedirection=up;	return; ;;
+	esac
+}
+
+getmouselocation; pushmouselocation
+
+while true
+do
+
+	sleep "$XJIGGLER_DETECTION_DELAY"
+	getmouselocation
+	if test "$XJIGGLER_lastX" = "$XJIGGLER_X" \
+			&& test "$XJIGGLER_lastY" = "$XJIGGLER_Y"
+	then	# no movement
+		test "$(printf '%s\n%s\n-\n' "$XJIGGLER_S" "$XJIGGLER_lastS" \
+				| dc)" -gt "$XJIGGLER_ACTION_DELAY" \
+			|| continue	# hasn't been long enough
+		rotatemousedirection; jiggle
+		printf '%s: Jiggled:\n' "$0"
+		printdebug | sed 's/^/\t/g'
+	else	# movement
+		pushmouselocation
+		printf '%s: Movement detected:\n' "$0"
+		printdebug | sed 's/^/\t/g'
+	fi
+done >&2