Fuser

The fuser command shows the PIDs of processes currently accessing a given file, filesystem, or unix socket. In the default display mode, each file name is followed by a letter indicating the access type:

c      当前目录.
e      正在运行.
f      打开文件。 默认显示模式中省略f。
F      打开文件为了写入。 在默认显示模式下，F被省略。
r      根目录.
m      mmap的文件或共享库.

Syntax

fuser [OPTIONS] name

-a, –all show all files specified on the command line. By default, only files accessed by at least one process are shown.

-k, –kill kill the processes accessing the file.

-i, –interactive ask for user confirmation before killing a process. Ignored if -k is not given.

-l, –list-signals list all known signal names.

-m NAME, –mount NAME show all processes using the given filesystem or block device

-M, –ismountpoint only carry out the request if NAME is a mount point; this can prevent you from accidentally killing the whole machine.

-w only kill processes that have write access. Ignored if -k is not given.

-n SPACE, –namespace SPACE select a different namespace (file, udp, tcp).

-s, –silent silent mode

-SIGNAL send the given signal instead of SIGKILL

-u, –user append the owning user’s username next to each PID.

-v, –verbose verbose mode.

Example

Show processes accessing this directory

fuser -v /opt/jupyterlab/

                     USER        PID ACCESS COMMAND
/opt/jupyterlab:     lfzyx      96365 ..c.. bash
                     root      123165 ..c.. sudo
                     root      123166 ..c.. su
                     root      123167 ..c.. bash
                     root      125752 ..c.. jupyterhub
                     root      125758 ..c.. node

Show processes accessing this filesystem or block device

fuser -v -m /mnt
fuser -v -m /dev/sdb1

                     USER        PID ACCESS COMMAND
/dev/sdb1:           root      kernel mount /mnt
                     root       93433 F.... mount.ntfs
                     lfzyx     109588 ..c.. bash
                     lfzyx     110408 F.c.. md5sum
                     lfzyx     110421 F.c.. md5sum

The fuser command can also be used to detect processes using a network port

fuser -v -n tcp 8000

                     USER        PID ACCESS COMMAND
8000/tcp:            root      125758 F.... node

Kill processes currently accessing this filesystem or network port

fuser -k -m /mnt
fuser -k  123/tcp