listing open file with lsof

So the story goes that I need to process (quite) a number of files..
Which I didn't write  a output to say what is being process..

lsof save that day. lsof can monitor file being open, which includes sockets.
For my case, the usage is easy

lsof +r -p  

The -p is for opening process, +r is to repeat until no file is opened by the process.

enjoy