fuser command to find out processes that hold references to the filesystem.

To find out which processes hold references to the filesystem, use fuser -cv option to print out processes with their commands.

$ fuser -cv /usr

	USER PID ACCESS COMMAND
/usr	root 283 ….m atd root 839 ….m sshd etc

Codes	Meaning
f,o	The process has a file open for reading or writing
c	The process’s current directory is on the filesystem
e,t	The process is currently executing a file.
r	The process’s root directory(set with chroot) is on the filesystem.
m,s	The process has mapped a file or shared library.

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