snippetbashTip

fuser — Display process IDs currently using files or sockets. More information: <https://manned.org/fuser>.

Submitted by: @import:tldr-pages·Mar 2, 2026·

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commandprocessfuserclicurrentlyusingidsdisplay

linux

Problem

How to use the fuser command: Display process IDs currently using files or sockets. More information: <https://manned.org/fuser>.

Solution

fuser — Display process IDs currently using files or sockets. More information: <https://manned.org/fuser>.

Find which processes are accessing a file or directory:

fuser {{path/to/file_or_directory}}

Show more fields (USER, PID, ACCESS, and COMMAND):

fuser {{[-v|--verbose]}} {{path/to/file_or_directory}}

Identify processes using a TCP socket:

fuser {{port}}/tcp

Kill all processes accessing a file or directory (sends the SIGKILL signal):

fuser {{[-k|--kill]}} {{path/to/file_or_directory}}

Find which processes are accessing the filesystem containing a specific file or directory:

fuser {{[-m|--mount]}} {{path/to/file_or_directory}}

Kill all processes with a TCP connection on a specific port:

fuser {{[-k|--kill]}} {{port}}/tcp

Code Snippets

Find which processes are accessing a file or directory

fuser {{path/to/file_or_directory}}

Show more fields (`USER`, `PID`, `ACCESS`, and `COMMAND`)

fuser {{[-v|--verbose]}} {{path/to/file_or_directory}}

Identify processes using a TCP socket

fuser {{port}}/tcp

Kill all processes accessing a file or directory (sends the `SIGKILL` signal)

fuser {{[-k|--kill]}} {{path/to/file_or_directory}}

Find which processes are accessing the filesystem containing a specific file or directory

fuser {{[-m|--mount]}} {{path/to/file_or_directory}}

Context

tldr-pages: linux/fuser

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