fuser - Linux Command - Unix Command

fuser - Linux Command - Unix Command

fuser - identify processes using files or sockets
SYNOPSIS
fuser [-a|-s] [-4|-6] [-n space] [-signal] [-kimuv] name ...
fuser -l
fuser -V
DESCRIPTION
fuser displays the PIDs of processes using the specified files or file systems. In the default display mode, each file name is followed by a letter denoting the type of access:
c
current directory.
e
executable being run.
f
open file. f is omitted in default display mode.
r
root directory.
m
mmap'ed file or shared library.
fuser returns a non-zero return code if none of the specified files is accessed or in case of a fatal error. If at least one access has been found, fuser returns zero.

In order to look up processes using TCP and UDP sockets, the corresponding name space has to be selected with the -n option. By default fuser will look in both IPv6 and IPv4 sockets. To change the default, behavour, use the -4 and -6 options. The socket(s) can be specified by the local and remote port, and the remote address. All fields are optional, but commas in front of missing fields must be present:

[lcl_port][,[rmt_host][,[rmt_port]]]

Either symbolic or numeric values can be used for IP addresses and port numbers.