mirror of https://github.com/mkerrisk/man-pages
201 lines
5.6 KiB
Groff
201 lines
5.6 KiB
Groff
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.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved
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.TH "FUSER" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
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.\" fuser
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.SH NAME
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fuser \- list process IDs of all processes that have one or more files
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open
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.SH SYNOPSIS
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.LP
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\fBfuser\fP \fB[\fP \fB-cfu\fP \fB]\fP \fIfile\fP \fB... \fP
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.SH DESCRIPTION
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.LP
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The \fIfuser\fP utility shall write to standard output the process
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IDs of processes running on the local system that have one
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or more named files open. For block special devices, all processes
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using any file on that device are listed.
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.LP
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The \fIfuser\fP utility shall write to standard error additional information
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about the named files indicating how the file is
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being used.
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.LP
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Any output for processes running on remote systems that have a named
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file open is unspecified.
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.LP
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A user may need appropriate privilege to invoke the \fIfuser\fP utility.
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.SH OPTIONS
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.LP
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The \fIfuser\fP utility shall conform to the Base Definitions volume
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of IEEE\ Std\ 1003.1-2001, Section 12.2, Utility Syntax Guidelines.
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.LP
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The following options shall be supported:
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.TP 7
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\fB-c\fP
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The file is treated as a mount point and the utility shall report
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on any files open in the file system.
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.TP 7
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\fB-f\fP
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The report shall be only for the named files.
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.TP 7
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\fB-u\fP
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The user name, in parentheses, associated with each process ID written
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to standard output shall be written to standard
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error.
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.sp
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.SH OPERANDS
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.LP
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The following operand shall be supported:
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.TP 7
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\fIfile\fP
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A pathname on which the file or file system is to be reported.
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.sp
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.SH STDIN
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.LP
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Not used.
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.SH INPUT FILES
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.LP
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The user database.
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.SH ENVIRONMENT VARIABLES
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.LP
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The following environment variables shall affect the execution of
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\fIfuser\fP:
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.TP 7
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\fILANG\fP
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Provide a default value for the internationalization variables that
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are unset or null. (See the Base Definitions volume of
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IEEE\ Std\ 1003.1-2001, Section 8.2, Internationalization Variables
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for
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the precedence of internationalization variables used to determine
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the values of locale categories.)
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.TP 7
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\fILC_ALL\fP
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If set to a non-empty string value, override the values of all the
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other internationalization variables.
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.TP 7
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\fILC_CTYPE\fP
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Determine the locale for the interpretation of sequences of bytes
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of text data as characters (for example, single-byte as
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opposed to multi-byte characters in arguments).
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.TP 7
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\fILC_MESSAGES\fP
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Determine the locale that should be used to affect the format and
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contents of diagnostic messages written to standard
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error.
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.TP 7
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\fINLSPATH\fP
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Determine the location of message catalogs for the processing of \fILC_MESSAGES
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\&.\fP
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.sp
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.SH ASYNCHRONOUS EVENTS
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.LP
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Default.
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.SH STDOUT
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.LP
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The \fIfuser\fP utility shall write the process ID for each process
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using each file given as an operand to standard output in
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the following format:
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.sp
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.RS
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.nf
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\fB"%d", <\fP\fIprocess_id\fP\fB>
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\fP
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.fi
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.RE
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.SH STDERR
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.LP
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The \fIfuser\fP utility shall write diagnostic messages to standard
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error.
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.LP
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The \fIfuser\fP utility also shall write the following to standard
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error:
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.IP " *" 3
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The pathname of each named file is written followed immediately by
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a colon.
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.LP
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.IP " *" 3
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For each process ID written to standard output, the character \fB'c'\fP
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shall be written to standard error if the process is
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using the file as its current directory and the character \fB'r'\fP
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shall be written to standard error if the process is using
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the file as its root directory. Implementations may write other alphabetic
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characters to indicate other uses of files.
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.LP
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.IP " *" 3
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When the \fB-u\fP option is specified, characters indicating the use
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of the file shall be followed immediately by the user
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name, in parentheses, corresponding to the process' real user ID.
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If the user name cannot be resolved from the process' real user
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ID, the process' real user ID shall be written instead of the user
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name.
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.LP
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.LP
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When standard output and standard error are directed to the same file,
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the output shall be interleaved so that the filename
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appears at the start of each line, followed by the process ID and
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characters indicating the use of the file. Then, if the \fB-u\fP
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option is specified, the user name or user ID for each process using
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that file shall be written.
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.LP
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A <newline> shall be written to standard error after the last output
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described above for each \fIfile\fP operand.
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.SH OUTPUT FILES
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.LP
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None.
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.SH EXTENDED DESCRIPTION
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.LP
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None.
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.SH EXIT STATUS
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.LP
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The following exit values shall be returned:
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.TP 7
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\ 0
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Successful completion.
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.TP 7
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>0
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An error occurred.
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.sp
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.SH CONSEQUENCES OF ERRORS
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.LP
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Default.
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.LP
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\fIThe following sections are informative.\fP
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.SH APPLICATION USAGE
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.LP
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None.
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.SH EXAMPLES
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.LP
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The command:
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.sp
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.RS
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.nf
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\fBfuser -fu .
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\fP
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.fi
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.RE
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.LP
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writes to standard output the process IDs of processes that are using
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the current directory and writes to standard error an
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indication of how those processes are using the directory and the
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user names associated with the processes that are using the
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current directory.
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.SH RATIONALE
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.LP
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The definition of the \fIfuser\fP utility follows existing practice.
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.SH FUTURE DIRECTIONS
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.LP
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None.
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.SH SEE ALSO
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.LP
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None.
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.SH COPYRIGHT
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Portions of this text are reprinted and reproduced in electronic form
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from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
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-- Portable Operating System Interface (POSIX), The Open Group Base
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Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
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Electrical and Electronics Engineers, Inc and The Open Group. In the
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event of any discrepancy between this version and the original IEEE and
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The Open Group Standard, the original IEEE and The Open Group Standard
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is the referee document. The original Standard can be obtained online at
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http://www.opengroup.org/unix/online.html .
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