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fuser(1) [freebsd man page]

FUSER(1)						    BSD General Commands Manual 						  FUSER(1)

NAME
fuser -- list IDs of all processes that have one or more files open SYNOPSIS
fuser [-cfkmu] [-M core] [-N system] [-s signal] file ... DESCRIPTION
The fuser utility writes to stdout the PIDs of processes that have one or more named files open. For block and character special devices, all processes using files on that device are listed. A file is considered open by a process if it was explicitly opened, is the working directory, root directory, jail root directory, active executable text, kernel trace file or the controlling terminal of the process. If -m option is specified, the fuser utility will also look through mmapped files. The following options are available: -c Treat files as mount point and report on any files open in the file system. -f The report must be only for named files. -k Send signal to reported processes (SIGKILL by default). -m Search through mmapped files too. -u Write the user name associated with each process to stderr. -M Extract values associated with the name list from the specified core instead of the default /dev/kmem. -N Extract the name list from the specified system instead of the default, which is the kernel image the system has booted from. -s Use given signal name instead of default SIGKILL. The following symbols, written to stderr will indicate how files is used: r The file is the root directory of the process. c The file is the current workdir directory of the process. j The file is the jail-root of the process. t The file is the kernel tracing file for the process. x The file is executable text of the process. y The process use this file as its controlling tty. m The file is mmapped. w The file is open for writing. a The file is open as append only (O_APPEND was specified). d The process bypasses fs cache while writing to this file (O_DIRECT was specified). s Shared lock is hold. e Exclusive lock is hold. EXIT STATUS
The fuser utility returns 0 on successful completion and >0 otherwise. EXAMPLES
The command: ``fuser -fu .'' writes to standard output the process IDs of processes that are using the current directory and writes to stderr an indication of how those processes are using the directory and user names associated with the processes that are using this directory. SEE ALSO
fstat(1), ps(1), systat(1), iostat(8), pstat(8), vmstat(8) STANDARDS
The fuser utility is expected to conform to IEEE Std 1003.1-2004 (``POSIX.1''). HISTORY
The fuser utility appeared in FreeBSD 9.0. AUTHORS
The fuser utility and this manual page was written by Stanislav Sedov <stas@FreeBSD.org>. BUGS
Since fuser takes a snapshot of the system, it is only correct for a very short period of time. When working via kvm(3) interface the report will be limited to filesystems the fuser utility knows about (currently only cd9660, devfs, nfs, ntfs, nwfs, udf, ufs and zfs). BSD
May 13, 2011 BSD

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FUSER(P)						     POSIX Programmer's Manual							  FUSER(P)

NAME
fuser - list process IDs of all processes that have one or more files open SYNOPSIS
fuser [ -cfu ] file ... DESCRIPTION
The fuser utility shall write to standard output the process IDs of processes running on the local system that have one or more named files open. For block special devices, all processes using any file on that device are listed. The fuser utility shall write to standard error additional information about the named files indicating how the file is being used. Any output for processes running on remote systems that have a named file open is unspecified. A user may need appropriate privilege to invoke the fuser utility. OPTIONS
The fuser utility shall conform to the Base Definitions volume of IEEE Std 1003.1-2001, Section 12.2, Utility Syntax Guidelines. The following options shall be supported: -c The file is treated as a mount point and the utility shall report on any files open in the file system. -f The report shall be only for the named files. -u The user name, in parentheses, associated with each process ID written to standard output shall be written to standard error. OPERANDS
The following operand shall be supported: file A pathname on which the file or file system is to be reported. STDIN
Not used. INPUT FILES
The user database. ENVIRONMENT VARIABLES
The following environment variables shall affect the execution of fuser: LANG Provide a default value for the internationalization variables that are unset or null. (See the Base Definitions volume of IEEE Std 1003.1-2001, Section 8.2, Internationalization Variables for the precedence of internationalization variables used to determine the values of locale categories.) LC_ALL If set to a non-empty string value, override the values of all the other internationalization variables. LC_CTYPE Determine the locale for the interpretation of sequences of bytes of text data as characters (for example, single-byte as opposed to multi-byte characters in arguments). LC_MESSAGES Determine the locale that should be used to affect the format and contents of diagnostic messages written to standard error. NLSPATH Determine the location of message catalogs for the processing of LC_MESSAGES . ASYNCHRONOUS EVENTS
Default. STDOUT
The fuser utility shall write the process ID for each process using each file given as an operand to standard output in the following for- mat: "%d", <process_id> STDERR
The fuser utility shall write diagnostic messages to standard error. The fuser utility also shall write the following to standard error: * The pathname of each named file is written followed immediately by a colon. * For each process ID written to standard output, the character 'c' shall be written to standard error if the process is using the file as its current directory and the character 'r' shall be written to standard error if the process is using the file as its root directory. Implementations may write other alphabetic characters to indicate other uses of files. * When the -u option is specified, characters indicating the use of the file shall be followed immediately by the user name, in parenthe- ses, corresponding to the process' real user ID. If the user name cannot be resolved from the process' real user ID, the process' real user ID shall be written instead of the user name. When standard output and standard error are directed to the same file, the output shall be interleaved so that the filename appears at the start of each line, followed by the process ID and characters indicating the use of the file. Then, if the -u option is specified, the user name or user ID for each process using that file shall be written. A <newline> shall be written to standard error after the last output described above for each file operand. OUTPUT FILES
None. EXTENDED DESCRIPTION
None. EXIT STATUS
The following exit values shall be returned: 0 Successful completion. >0 An error occurred. CONSEQUENCES OF ERRORS
Default. The following sections are informative. APPLICATION USAGE
None. EXAMPLES
The command: fuser -fu . writes to standard output the process IDs of processes that are using the current directory and writes to standard error an indication of how those processes are using the directory and the user names associated with the processes that are using the current directory. RATIONALE
The definition of the fuser utility follows existing practice. FUTURE DIRECTIONS
None. SEE ALSO
None. COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol- ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html . IEEE
/The Open Group 2003 FUSER(P)
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