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System Administration Commands fuser(1M)
NAME
fuser - identify users of files and devices
SYNOPSIS
/usr/sbin/fuser [-c | -d | -f] [-nu] [-k | -s sig] files [
[- ] [-c | -d | -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
SunOS 5.10 Last change: 21 Oct 2003 1
System Administration Commands fuser(1M)
types of files (text files, executables, directories, dev-
ices, and so forth), only the processes using that file are
reported.
For all types of devices, fuser also displays any known ker-
nel consumers that have the device open. Kernel consumers
are displayed in one of the following formats:
[module_name]
[module_name,dev_path=path]
[module_name,dev=(major,minor)]
[module_name,dev=(major,minor),dev_path=path]
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
systems, and any files within that mounted file
system.
-d Report device usage information for all minor nodes
bound to the same device node as the specified
minor node. This option does not report file usage
for files within a 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
messages may not show up immediately (see kill(2)).
No signals will be sent to kernel file consumers.
SunOS 5.10 Last change: 21 Oct 2003 2
System Administration Commands fuser(1M)
-n Lists only processes with non-blocking mandatory
locks on a file.
-s sig Sends a signal to each process. The sig option
argument 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. No signals will be sent to ker-
nel file consumers.
-u Displays the user login name in parentheses follow-
ing 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 environment
variables that affect the execution of fuser: LANG, LC_ALL
LC_CTYPE, LC_MESSAGES, and NLSPATH.
SunOS 5.10 Last change: 21 Oct 2003 3
System Administration Commands fuser(1M)
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.
SunOS 5.10 Last change: 21 Oct 2003 4
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This page was generated on Wed Sep 12 11:26:00 GMT 2007
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