#!/bin/bash

DIR="."
CMD="$1"

$CMD &
PID=$!

OLD=$(ls -R --full-time "$DIR")

while :; do
	NEW=$(ls -R --full-time "$DIR")
	if [ "$OLD" != "$NEW" ]; then
		OLD=$(ls -R --full-time "$DIR")

		kill -9 "$PID" > /dev/null
		[ $? != "0" ] && echo "Process $PID doesn't exist."

		echo $CMD | sh &
		PID=$!

		# Print bell character
		echo -e "\a"
	fi

	sleep 1
done