How to monitor processes that accessed a particular file?
you could watch to execute commands at periodic intervals. Watch also supports a differences flag for purposes of highlighting differences on consecutive runs
watch -n 5 'fuser file_name'
You could use inotifywatch, assuming you are on a Linux.
This command will print all access and modifies on a file for 60 seconds, then prints out stats.
inotifywatch -v -e access -e modify -t 60 filenameYou can get inotifywatch's source as https://github.com/rvoicilas/inotify-tools/wiki