How to list files being used by the application
When you need to know which files are being used by the application un unix/linux, you could try using the lsof command:
$ lsof -p <pid number>
But sometimes there is no lsof installed. In that case you can you the awk command:
$ pid=1337$ awk '!/\[/&&$6{_[$6]++}END{for(i in _)print i}' /proc/$pid/maps