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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>cancel</title></head><body bgcolor=white><center><font size=2>The Single UNIX ® Specification, Version 2<br>Copyright © 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_000_000_248"> </a>NAME</h4><blockquote>cancel - cancel printer requests (<b><a href="intro.html#tag_001_003_003">LEGACY</a></b>)</blockquote><h4><a name = "tag_000_000_249"> </a>SYNOPSIS</h4><blockquote><pre><code>cancel <b>[</b><i>ID</i> ...<b>] </b><i>printer</i> ... cancel <i>ID</i> ...<b>[</b><i>printer</i> ...<b>] </b></code></pre></blockquote><h4><a name = "tag_000_000_250"> </a>DESCRIPTION</h4><blockquote>The<i>cancel</i>utility cancels printer requests that were made by an<i><a href="lp.html">lp</a></i>command.The cancellation of a requestthat is currently printing frees the printerto print its next available request.<p>Cancelling requests from other users requires appropriate privileges.For each request successfully cancelled by a userwho did not submit the request, the submittermay be notified that the request was cancelled.<p>The<i>cancel</i>utility cannot reliably cancel print requests in all conceivablecircumstances.When the printer is under the control of anotheroperating system or resides on a remote systemacross a network, it might not be possible toaffect the status of the print job after ithas left the control of the local operating system.Even on local printers, spooling hardware in theprinter may make it appear that the print jobhas been completed long before the final page is printed.</blockquote><h4><a name = "tag_000_000_251"> </a>OPTIONS</h4><blockquote>None.<br></blockquote><h4><a name = "tag_000_000_252"> </a>OPERANDS</h4><blockquote>The following operands are supported:<dl compact><dt><i>ID</i><dd>A<i>request ID</i>,as returned by<i><a href="lp.html">lp</a></i>.Specifying a<i>request ID</i>cancels the associated request even if it is currently printing.<dt><i>printer</i><dd>A printer name(for a complete list of printer names, use<i><a href="lpstat.html">lpstat</a></i>).Specifying a printercancels the request that is currently printing on that printer.</dl></blockquote><h4><a name = "tag_000_000_253"> </a>STDIN</h4><blockquote>Not used.</blockquote><h4><a name = "tag_000_000_254"> </a>INPUT FILES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_000_255"> </a>ENVIRONMENT VARIABLES</h4><blockquote>The following environment variables affect the execution of<i>cancel</i>:<dl compact><dt><i>LANG</i><dd>Provide a default value for the internationalisation variablesthat are unset or null.If<i>LANG</i>is unset or null, the corresponding value from theimplementation-dependent default locale will be used.If any of the internationalisation variables contains an invalid setting, theutility will behave as if none of the variables had been defined.<dt><i>LC_ALL</i><dd>If set to a non-empty string value,override the values of all the other internationalisation variables.<dt><i>LC_CTYPE</i><dd>Determine thelocale for the interpretation of sequences of bytes of text data ascharacters (for example, single- as opposed to multi-byte charactersin arguments).<dt><i>LC_MESSAGES</i><dd>Determine the locale that should be used to affectthe format and contents of diagnosticmessages written to standard error,and informative messages written to standard output.<dt><i>NLSPATH</i><dd>Determine the location of message cataloguesfor the processing of<i>LC_MESSAGES .</i></dl></blockquote><h4><a name = "tag_000_000_256"> </a>ASYNCHRONOUS EVENTS</h4><blockquote>Default.</blockquote><h4><a name = "tag_000_000_257"> </a>STDOUT</h4><blockquote>The standard output is a text file containing the statusof each cancellation request,in an unspecified format.</blockquote><h4><a name = "tag_000_000_258"> </a>STDERR</h4><blockquote>Used only for diagnostic messages.</blockquote><h4><a name = "tag_000_000_259"> </a>OUTPUT FILES</h4><blockquote>If mail notification is used to inform users oftheir requests being cancelled by other users, mail fileswill be modified.</blockquote><h4><a name = "tag_000_000_260"> </a>EXTENDED DESCRIPTION</h4><blockquote>None.</blockquote><h4><a name = "tag_000_000_261"> </a>EXIT STATUS</h4><blockquote>The following exit values are returned:<dl compact><dt>0<dd>Successful completion.<dt>>0<dd>An error occurred.</dl></blockquote><h4><a name = "tag_000_000_262"> </a>CONSEQUENCES OF ERRORS</h4><blockquote>Default.</blockquote><h4><a name = "tag_000_000_263"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_000_264"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_000_265"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_000_266"> </a>SEE ALSO</h4><blockquote><i><a href="lp.html">lp</a></i>,<i><a href="lpstat.html">lpstat</a></i>,<i><a href="mailx.html">mailx</a></i>.</blockquote><hr size=2 noshade><center><font size=2>UNIX ® is a registered Trademark of The Open Group.<br>Copyright © 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>⌨️ 快捷键说明
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