276 lines
8.3 KiB
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276 lines
8.3 KiB
HTML
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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title>fuser</title>
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<basefont size="3"> <a name="fuser"></a> <a name="tag_04_58"></a><!-- fuser -->
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<!--header start-->
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<center><font size="2">The Open Group Base Specifications Issue 6<br>
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IEEE Std 1003.1-2001<br>
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Copyright © 2001 The IEEE and The Open Group, All Rights reserved.</font></center>
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<!--header end-->
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<hr size="2" noshade>
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<h4><a name="tag_04_58_01"></a>NAME</h4>
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<blockquote>fuser - list process IDs of all processes that have one or more files open</blockquote>
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<h4><a name="tag_04_58_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<div class="box"><code><tt><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt=
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"[Option Start]" border="0"> fuser</tt> <b>[</b> <tt>-cfu</tt> <b>]</b> <i>file</i> <tt>... <img src="../images/opt-end.gif" alt=
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"[Option End]" border="0"></tt></code></div>
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</blockquote>
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<h4><a name="tag_04_58_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i>fuser</i> utility shall write to standard output the process 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 using any file on that device are listed.</p>
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<p>The <i>fuser</i> utility shall write to standard error additional information about the named files indicating how the file is
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being used.</p>
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<p>Any output for processes running on remote systems that have a named file open is unspecified.</p>
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<p>A user may need appropriate privilege to invoke the <i>fuser</i> utility.</p>
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</blockquote>
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<h4><a name="tag_04_58_04"></a>OPTIONS</h4>
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<blockquote>
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<p>The <i>fuser</i> utility shall conform to the Base Definitions volume of IEEE Std 1003.1-2001, <a href=
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"../basedefs/xbd_chap12.html#tag_12_02">Section 12.2, Utility Syntax Guidelines</a>.</p>
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<p>The following options shall be supported:</p>
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<dl compact>
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<dt><b>-c</b></dt>
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<dd>The file is treated as a mount point and the utility shall report on any files open in the file system.</dd>
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<dt><b>-f</b></dt>
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<dd>The report shall be only for the named files.</dd>
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<dt><b>-u</b></dt>
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<dd>The user name, in parentheses, associated with each process ID written to standard output shall be written to standard
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error.</dd>
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</dl>
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</blockquote>
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<h4><a name="tag_04_58_05"></a>OPERANDS</h4>
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<blockquote>
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<p>The following operand shall be supported:</p>
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<dl compact>
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<dt><i>file</i></dt>
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<dd>A pathname on which the file or file system is to be reported.</dd>
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</dl>
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</blockquote>
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<h4><a name="tag_04_58_06"></a>STDIN</h4>
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<blockquote>
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<p>Not used.</p>
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</blockquote>
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<h4><a name="tag_04_58_07"></a>INPUT FILES</h4>
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<blockquote>
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<p>The user database.</p>
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</blockquote>
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<h4><a name="tag_04_58_08"></a>ENVIRONMENT VARIABLES</h4>
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<blockquote>
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<p>The following environment variables shall affect the execution of <i>fuser</i>:</p>
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<dl compact>
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<dt><i>LANG</i></dt>
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<dd>Provide a default value for the internationalization variables that are unset or null. (See the Base Definitions volume of
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IEEE Std 1003.1-2001, <a href="../basedefs/xbd_chap08.html#tag_08_02">Section 8.2, Internationalization Variables</a> for
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the precedence of internationalization variables used to determine the values of locale categories.)</dd>
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<dt><i>LC_ALL</i></dt>
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<dd>If set to a non-empty string value, override the values of all the other internationalization variables.</dd>
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<dt><i>LC_CTYPE</i></dt>
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<dd>Determine the locale for the interpretation of sequences of bytes of text data as characters (for example, single-byte as
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opposed to multi-byte characters in arguments).</dd>
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<dt><i>LC_MESSAGES</i></dt>
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<dd>Determine the locale that should be used to affect the format and contents of diagnostic messages written to standard
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error.</dd>
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<dt><i>NLSPATH</i></dt>
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<dd>Determine the location of message catalogs for the processing of <i>LC_MESSAGES .</i></dd>
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</dl>
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</blockquote>
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<h4><a name="tag_04_58_09"></a>ASYNCHRONOUS EVENTS</h4>
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<blockquote>
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<p>Default.</p>
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</blockquote>
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<h4><a name="tag_04_58_10"></a>STDOUT</h4>
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<blockquote>
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<p>The <i>fuser</i> utility shall write the process ID for each process using each file given as an operand to standard output in
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the following format:</p>
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<pre>
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<tt>"%d", <</tt><i>process_id</i><tt>>
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</tt>
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</pre>
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</blockquote>
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<h4><a name="tag_04_58_11"></a>STDERR</h4>
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<blockquote>
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<p>The <i>fuser</i> utility shall write diagnostic messages to standard error.</p>
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<p>The <i>fuser</i> utility also shall write the following to standard error:</p>
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<ul>
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<li>
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<p>The pathname of each named file is written followed immediately by a colon.</p>
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</li>
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<li>
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<p>For each process ID written to standard output, the character <tt>'c'</tt> shall be written to standard error if the process is
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using the file as its current directory and the character <tt>'r'</tt> 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 characters to indicate other uses of files.</p>
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</li>
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<li>
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<p>When the <b>-u</b> option is specified, characters indicating the use of the file shall be followed immediately by the user
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name, in parentheses, corresponding to the process' real user ID. 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 name.</p>
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</li>
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</ul>
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<p>When standard output and standard error are directed to the same file, 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 characters indicating the use of the file. Then, if the <b>-u</b>
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option is specified, the user name or user ID for each process using that file shall be written.</p>
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<p>A <newline> shall be written to standard error after the last output described above for each <i>file</i> operand.</p>
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</blockquote>
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<h4><a name="tag_04_58_12"></a>OUTPUT FILES</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_04_58_13"></a>EXTENDED DESCRIPTION</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_04_58_14"></a>EXIT STATUS</h4>
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<blockquote>
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<p>The following exit values shall be returned:</p>
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<dl compact>
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<dt> 0</dt>
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<dd>Successful completion.</dd>
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<dt>>0</dt>
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<dd>An error occurred.</dd>
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</dl>
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</blockquote>
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<h4><a name="tag_04_58_15"></a>CONSEQUENCES OF ERRORS</h4>
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<blockquote>
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<p>Default.</p>
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</blockquote>
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<hr>
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<div class="box"><em>The following sections are informative.</em></div>
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<h4><a name="tag_04_58_16"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_04_58_17"></a>EXAMPLES</h4>
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<blockquote>
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<p>The command:</p>
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<pre>
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<tt>fuser -fu .
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</tt>
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</pre>
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<p>writes to standard output the process IDs of processes that are using the current directory and writes to standard error an
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indication of how those processes are using the directory and the user names associated with the processes that are using the
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current directory.</p>
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</blockquote>
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<h4><a name="tag_04_58_18"></a>RATIONALE</h4>
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<blockquote>
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<p>The definition of the <i>fuser</i> utility follows existing practice.</p>
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</blockquote>
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<h4><a name="tag_04_58_19"></a>FUTURE DIRECTIONS</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_04_58_20"></a>SEE ALSO</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_04_58_21"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 5.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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<hr>
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<hr size="2" noshade>
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<center><font size="2"><!--footer start-->
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UNIX ® is a registered Trademark of The Open Group.<br>
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POSIX ® is a registered Trademark of The IEEE.<br>
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[ <a href="../mindex.html">Main Index</a> | <a href="../basedefs/contents.html">XBD</a> | <a href=
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"../utilities/contents.html">XCU</a> | <a href="../functions/contents.html">XSH</a> | <a href="../xrat/contents.html">XRAT</a>
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]</font></center>
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