fuser(1M)
NAME
fuser - identify processes using a file or file structure
SYNOPSIS
/usr/sbin/fuser [-c | -f] [-nu] [-k | -s sig] files [ [- ]
[-c | -f] [-nu] [-k | -s sig] files] ...
DESCRIPTION
The fuser utility displays the process IDs of the processes
that are using the files specified as arguments.
Each process ID is followed by a letter code. These letter
codes are interpreted as follows. If the process is using
the file as
c Indicates that the process is using the file as its
current directory.
m Indicates that the process is using a file mapped with
mmap(2). See mmap(2) for details.
n Indicates that the process is holding a non-blocking
mandatory lock on the file.
o Indicates that the process is using the file as an
open file.
r Indicates that the process is using the file as its
root directory.
t Indicates that the process is using the file as its
text file.
y Indicates that the process is using the file as its
controlling terminal.
For block special devices with mounted file systems, all
processes using any file on that device are listed. For all
types of files (text files, executables, directories, dev-
ices, and so forth), only the processes using that file are
reported.
If more than one group of files are specified, the options
may be respecified for each additional group of files. A
lone dash cancels the options currently in force.
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 run fuser, but only the superuser can terminate
another user's process.
OPTIONS
The following options are supported:
-c Reports on files that are mount points for file sys-
tems, and any files within that mounted file system.
-f Prints a report for the named file, not for files
within a mounted file system.
-k Sends the SIGKILL signal to each process. Since this
option spawns kills for each process, the kill mes-
sages may not show up immediately (see kill(2)).
-n Lists only processes with non-blocking mandatory locks
on a file.
-s sig
Sends a signal to each process. The sig option argu-
ment specifies one of the symbolic names defined in
the <signal.h> header, or a decimal integer signal
number. If sig is a symbolic name, it is recognized in
a case-independent fashion, without the SIG prefix.
The -k option is equivalent to -s KILL or -s 9.
-u Displays the user login name in parentheses following
the process ID.
EXAMPLES
Example 1: Reporting on the mount point and files
The following example reports on the mount point and files
within the mounted file system.
example% fuser -c /export/foo
Example 2: Restricting output when reporting on the mount
point and files
The following example reports on the mount point and files
within the mounted file system, but the output is restricted
to processes that hold non-blocking mandatory locks.
example% fuser -cn /export/foo
Example 3: Sending SIGTERM to processes holding a non-
blocking mandatory lock
The following command sends SIGTERM to any processes that
hold a non-blocking mandatory lock on file
/export/foo/my_file.
example% fuser -fn -s term /export/foo/my_file
ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environ-
ment variables that affect the execution of fuser: LANG,
LC_ALL LC_CTYPE, LC_MESSAGES, and NLSPATH.
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Availability | SUNWcsu |
|_____________________________|_____________________________|
| Interface Stability | Standard |
|_____________________________|_____________________________|
SEE ALSO
ps(1), mount(1M), kill(2), mmap(2), signal(3C), attri-
butes(5), environ(5), standards(5)
NOTES
Because fuser works with a snapshot of the system image, it
may miss processes that begin using a file while fuser is
running. Also, processes reported as using a file may have
stopped using it while fuser was running. These factors
should discourage the use of the -k option.
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