list all currently open files
(in unix anything is a file, so this also includes processes, sockets etc.)

EXAMPLES
	lsof -i :8000
		print a list of all files/processes that are currently operating on port 8000
	lsof -p <PID>
		print a list of all files/processes that are currently opened by the process with <PID>

FLAGS
	-i 	specify an internet address search pattern for files to match
