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fuser(1M)							     fuser(1M)

NAME    [Toc]    [Back]

     fuser - identify processes	using a	file or	file structure

SYNOPSIS    [Toc]    [Back]

     fuser [-[c|f]kqu] files [[-] [-[c|f]kqu] files

DESCRIPTION    [Toc]    [Back]

     fuser outputs the process IDs of the processes that are using the files
     specified as arguments.  Each process ID is followed by one of these
     letter codes, which identify how the process is using the file:

     c	 As its	current	directory.

     r	 As its	root directory,	which was set up by the	chroot(1M) command.

     o	 As an open file.

     t	 As its	text file.

     m	 As a mapped file, requested by	mmap(2)	or exec(2) in the case of
	 dynamic shared	libraries.

     y	 As its	controlling terminal.

     a	 As its	trace file located in the /proc	directory.

     For block special devices with mounted filesystems, processes using any
     file on that device are listed (unless the	-f flag	is specified).	If
     file has the form hostname:pathname and names a mounted NFS filesystem,
     all processes using any file in that system are listed.

     If	file has the form port/protocol	or hostname:port/protocol and names no
     file or directory,	fuser lists all	processes using	sockets	bound or
     connected to the specified	port.  port may	be either an integer constant
     or	a service name (see services(4)).  protocol must be either tcp,	udp,
     or	stp, and hostname (if specified) must be an Internet address or
     hostname (see hosts(4)).  For all other types of files (text files,
     executables, directories, devices,	UNIX-domain sockets, and so on)	only
     the processes using that file are reported.

     The following options may be used with fuser:

     -c	  May be used with files that are mount	points for filesystems.	 With
	  that option the report is for	use of the mount point and any files
	  within that mounted filesystem.

     -f	  When this is used, the report	is only	for the	named file, not	for
	  files	within a mounted filesystem or block device.  Note that	-f and
	  -c are mutually exclusive.

									Page 1

fuser(1M)							     fuser(1M)

     -u	  The user login name, in parentheses, also follows the	process	ID.

     -q	  Quiet	mode: fuser prints nothing except process IDs separated	by
	  commas to the	standard output.  This option is useful	in conjunction
	  with the -p option of	ps(1).

     -k	  The SIGKILL signal is	sent to	each process.  Since this option
	  spawns kills for each	process, the kill messages may not show	up
	  immediately (see kill(2)).

     -	  A lone dash cancels the options currently in force.

     If	more than one group of files are specified, the	options	may be
     respecified for each additional group of files.

     If	the -q flag is not in effect, the process IDs are printed as a single
     line on the standard output, separated by spaces and terminated with a
     single new	line.  All other output	is written on standard error.

     Any user can use fuser.  Only a privileged	user can terminate another
     user's process.

EXAMPLES    [Toc]    [Back]

	  fuser	-cku /usr

     If	typed by a user	with appropriate privileges, terminates	all processes
     that are preventing /usr filesystem from being unmounted, listing the
     process ID	and login name of each as it is	killed.

	  fuser	-u /etc/passwd

     Lists process IDs and login names of processes that have the password
     file open.

	  fuser	-cku /usr -u /etc/passwd

     Executes both of the above	examples in a single command line.

CAVEATS    [Toc]    [Back]

     TCP, UDP, and STP ports bound by the kernel (e.g. NFS client endpoints)
     cannot be mapped to a process ID and no output will be generated.

     TCP, UDP, and STP ports bound by TLI applications (e.g.  rpcbind(1M))
     cannot be currently mapped	to a process ID	and no output will be
     generated.	 This will be corrected	in a future release.

SEE ALSO    [Toc]    [Back]

     chroot(1M), mount(1M), ps(1), kill(2), signal(2), proc(4).

									PPPPaaaaggggeeee 2222
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