How to find which processes are using a particular file in linux?

Answer 1

By using lsof command in Linux. It 'll list down PID of all the process which is using a particular file
i.e To find user specific open files you use # lsof -u tecmint.If you want to List Open Files of TCP Port ranges 1-1024 then use # lsof -i TCP:1-1024

Answer 2

By using lsof command in UNIX. It wills list down PID of all the process which is using a particular file.