236 lines
7.5 KiB
HTML
236 lines
7.5 KiB
HTML
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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title>logger</title>
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</head>
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<body bgcolor="white">
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<script type="text/javascript" language="JavaScript" src="../jscript/codes.js">
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<basefont size="3"> <a name="logger"></a> <a name="tag_04_78"></a><!-- logger -->
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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_78_01"></a>NAME</h4>
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<blockquote>logger - log messages</blockquote>
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<h4><a name="tag_04_78_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<p><code><tt>logger</tt> <i>string</i> <tt>...</tt></code></p>
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</blockquote>
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<h4><a name="tag_04_78_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i>logger</i> utility saves a message, in an unspecified manner and format, containing the <i>string</i> operands provided
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by the user. The messages are expected to be evaluated later by personnel performing system administration tasks.</p>
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<p>It is implementation-defined whether messages written in locales other than the POSIX locale are effective.</p>
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</blockquote>
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<h4><a name="tag_04_78_04"></a>OPTIONS</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_78_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>string</i></dt>
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<dd>One of the string arguments whose contents are concatenated together, in the order specified, separated by single
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<space>s.</dd>
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</dl>
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</blockquote>
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<h4><a name="tag_04_78_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_78_07"></a>INPUT 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_78_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>logger</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 error.
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(This means diagnostics from <i>logger</i> to the user or application, not diagnostic messages that the user is sending to the
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system administrator.)</dd>
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<dt><i>NLSPATH</i></dt>
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<dd><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0">
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Determine the location of message catalogs for the processing of <i>LC_MESSAGES .</i> <img src="../images/opt-end.gif" alt=
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"[Option End]" border="0"></dd>
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</dl>
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</blockquote>
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<h4><a name="tag_04_78_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_78_10"></a>STDOUT</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_78_11"></a>STDERR</h4>
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<blockquote>
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<p>The standard error shall be used only for diagnostic messages.</p>
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</blockquote>
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<h4><a name="tag_04_78_12"></a>OUTPUT FILES</h4>
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<blockquote>
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<p>Unspecified.</p>
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</blockquote>
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<h4><a name="tag_04_78_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_78_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_78_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_78_16"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>This utility allows logging of information for later use by a system administrator or programmer in determining why
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non-interactive utilities have failed. The locations of the saved messages, their format, and retention period are all unspecified.
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There is no method for a conforming application to read messages, once written.</p>
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</blockquote>
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<h4><a name="tag_04_78_17"></a>EXAMPLES</h4>
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<blockquote>
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<p>A batch application, running non-interactively, tries to read a configuration file and fails; it may attempt to notify the
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system administrator with:</p>
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<pre>
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<tt>logger myname: unable to read file foo. [timestamp]
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</tt>
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</pre>
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</blockquote>
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<h4><a name="tag_04_78_18"></a>RATIONALE</h4>
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<blockquote>
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<p>The standard developers believed strongly that some method of alerting administrators to errors was necessary. The obvious
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example is a batch utility, running non-interactively, that is unable to read its configuration files or that is unable to create
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or write its results file. However, the standard developers did not wish to define the format or delivery mechanisms as they have
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historically been (and will probably continue to be) very system-specific, as well as involving functionality clearly outside the
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scope of this volume of IEEE Std 1003.1-2001.</p>
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<p>The text with <i>LC_MESSAGES</i> about diagnostic messages means diagnostics from <i>logger</i> to the user or application, not
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diagnostic messages that the user is sending to the system administrator.</p>
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<p>Multiple <i>string</i> arguments are allowed, similar to <a href="../utilities/echo.html"><i>echo</i></a>, for ease-of-use.</p>
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<p>Like the utilities <a href="../utilities/mailx.html"><i>mailx</i></a> and <a href="../utilities/lp.html"><i>lp</i></a>,
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<i>logger</i> is admittedly difficult to test. This was not deemed sufficient justification to exclude these utilities from this
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volume of IEEE Std 1003.1-2001. It is also arguable that they are, in fact, testable, but that the tests themselves are
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not portable.</p>
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</blockquote>
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<h4><a name="tag_04_78_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_78_20"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="lp.html"><i>lp</i></a> , <a href="mailx.html"><i>mailx</i></a> , <a href="write.html"><i>write</i>()</a></p>
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</blockquote>
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<h4><a name="tag_04_78_21"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 4.</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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