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<HTML><!--Distributed by F --><HEAD><TITLE>[Chapter 40] 40.9 Checking and Removing Jobs </TITLE><METANAME="DC.title"CONTENT="UNIX Power Tools"><METANAME="DC.creator"CONTENT="Jerry Peek, Tim O'Reilly & Mike Loukides"><METANAME="DC.publisher"CONTENT="O'Reilly & Associates, Inc."><METANAME="DC.date"CONTENT="1998-08-04T21:50:38Z"><METANAME="DC.type"CONTENT="Text.Monograph"><METANAME="DC.format"CONTENT="text/html"SCHEME="MIME"><METANAME="DC.source"CONTENT="1-56592-260-3"SCHEME="ISBN"><METANAME="DC.language"CONTENT="en-US"><METANAME="generator"CONTENT="Jade 1.1/O'Reilly DocBook 3.0 to HTML 4.0"><LINKREV="made"HREF="mailto:online-books@oreilly.com"TITLE="Online Books Comments"><LINKREL="up"HREF="ch40_01.htm"TITLE="40. Delayed Execution"><LINKREL="prev"HREF="ch40_08.htm"TITLE="40.8 Automatically Restarting at Jobs "><LINKREL="next"HREF="ch40_10.htm"TITLE="40.10 nextday, nextweekday: Tomorrow or Next Weekday "></HEAD><BODYBGCOLOR="#FFFFFF"TEXT="#000000"><DIVCLASS="htmlnav"><H1><IMGSRC="gifs/smbanner.gif"ALT="UNIX Power Tools"USEMAP="#srchmap"BORDER="0"></H1><MAPNAME="srchmap"><AREASHAPE="RECT"COORDS="0,0,466,58"HREF="index.htm"ALT="UNIX Power Tools"><AREASHAPE="RECT"COORDS="467,0,514,18"HREF="jobjects/fsearch.htm"ALT="Search this book"></MAP><TABLEWIDTH="515"BORDER="0"CELLSPACING="0"CELLPADDING="0"><TR><TDALIGN="LEFT"VALIGN="TOP"WIDTH="172"><ACLASS="SECT1"HREF="ch40_08.htm"TITLE="40.8 Automatically Restarting at Jobs "><IMGSRC="gifs/txtpreva.gif"SRC="gifs/txtpreva.gif"ALT="Previous: 40.8 Automatically Restarting at Jobs "BORDER="0"></A></TD><TDALIGN="CENTER"VALIGN="TOP"WIDTH="171"><B><FONTFACE="ARIEL,HELVETICA,HELV,SANSERIF"SIZE="-1">Chapter 40<BR>Delayed Execution</FONT></B></TD><TDALIGN="RIGHT"VALIGN="TOP"WIDTH="172"><ACLASS="SECT1"HREF="ch40_10.htm"TITLE="40.10 nextday, nextweekday: Tomorrow or Next Weekday "><IMGSRC="gifs/txtnexta.gif"SRC="gifs/txtnexta.gif"ALT="Next: 40.10 nextday, nextweekday: Tomorrow or Next Weekday "BORDER="0"></A></TD></TR></TABLE> <HRALIGN="LEFT"WIDTH="515"TITLE="footer"></DIV><DIVCLASS="SECT1"><H2CLASS="sect1"><ACLASS="title"NAME="UPT-ART-2320">40.9 Checking and Removing Jobs </A></H2><PCLASS="para"><ACLASS="indexterm"NAME="AUTOID-44812"></A><ACLASS="indexterm"NAME="AUTOID-44815"></A><ACLASS="indexterm"NAME="AUTOID-44818"></A>From time to time, you'll submit an <EMCLASS="emphasis">at</EM> job and realize thatthere's something wrong with it.How do you get it out of the queue?Two tools help you do this: <EMCLASS="emphasis">atq</EM>, which reports the jobs that arein the queue, and <EMCLASS="emphasis">atrm</EM>, which deletes jobs that are already inthe queue.</P><PCLASS="para"><EMCLASS="emphasis">atq</EM> is pretty simple; by default, it reports on all jobs thathave been queued.Optionally, you can give it a user name as anargument; in this case it reports all the jobs queued by the given user.The report looks like this:</P><PCLASS="para"><BLOCKQUOTECLASS="screen"><PRECLASS="screen">los% <CODECLASS="userinput"><B>atq</B></CODE> Rank Execution Date Owner Job # Queue Job Name 1st Oct 9, 1996 22:27 mikel 4637 a stdin 2nd Oct 10, 1996 01:08 mikel 4641 a stdin 3rd Oct 10, 1996 02:34 judy 4663 a stdin</PRE></BLOCKQUOTE></P><PCLASS="para">Note that <EMCLASS="emphasis">atq</EM> has no objection to telling you about other users'jobs. Although this might seem like a security hole, it's actuallyuseful - see article<ACLASS="xref"HREF="ch40_05.htm"TITLE="Avoiding Other at and cron Jobs ">40.5</A>.The jobs are ordered according to their execution date. With the<EMCLASS="emphasis">-c</EM> option, <EMCLASS="emphasis">atq</EM> orders jobs according to when they werequeued - conceivably a useful feature. (<EMCLASS="emphasis">atq - n</EM> just prints thenumber of jobs that are queued; I'm not sure when this would beuseful.)</P><PCLASS="para"><ACLASS="indexterm"NAME="AUTOID-44836"></A><ACLASS="indexterm"NAME="AUTOID-44838"></A>Once you've found out the job number, you can delete it with thecommand <EMCLASS="emphasis">atrm</EM>. You can only delete your own jobs, not someoneelse's:</P><PCLASS="para"><BLOCKQUOTECLASS="screen"><PRECLASS="screen">% <CODECLASS="userinput"><B>atrm 4637</B></CODE>4637: removed% <CODECLASS="userinput"><B>atrm 4663</B></CODE>4663: permission denied</PRE></BLOCKQUOTE></P><PCLASS="para">The command <EMCLASS="emphasis">atrm -</EM> removes all the jobs you submitted; it's goodfor cleaning out your queue completely.</P><BLOCKQUOTECLASS="note"><PCLASS="para"><STRONG>NOTE:</STRONG> <ACLASS="indexterm"NAME="AUTOID-44850"></A><ACLASS="indexterm"NAME="AUTOID-44853"></A>On System V prior to SVR4, use <EMCLASS="emphasis">at -l</EM> to list your jobs (insteadof <EMCLASS="emphasis">atq</EM>), and <EMCLASS="emphasis">at -r</EM> to delete your jobs (instead of <EMCLASS="emphasis">atrm</EM>).SunOS andSVR4 support both versions.</P><PCLASS="para">Some older BSD-based implementations may not support any of theseoptions.Once you submit a job, you can delete it by finding its filename in the<EMCLASS="emphasis">/usr/spool/at</EM> directory and<SPANCLASS="link">emptying the file (<ACLASS="linkend"HREF="ch24_01.htm#UPT-ART-1730"TITLE="Instead of Removing a File, Empty It ">24.1</A>)</SPAN>.Or the<SPANCLASS="link">superuser (<ACLASS="linkend"HREF="ch01_24.htm"TITLE="The Superuser (Root) ">1.24</A>)</SPAN>can go to the spool directory anddelete the file by hand.</P></BLOCKQUOTE><DIVCLASS="sect1info"><PCLASS="SECT1INFO">- <SPANCLASS="authorinitials">ML</SPAN></P></DIV></DIV><DIVCLASS="htmlnav"><P></P><HRALIGN="LEFT"WIDTH="515"TITLE="footer"><TABLEWIDTH="515"BORDER="0"CELLSPACING="0"CELLPADDING="0"><TR><TDALIGN="LEFT"VALIGN="TOP"WIDTH="172"><ACLASS="SECT1"HREF="ch40_08.htm"TITLE="40.8 Automatically Restarting at Jobs "><IMGSRC="gifs/txtpreva.gif"SRC="gifs/txtpreva.gif"ALT="Previous: 40.8 Automatically Restarting at Jobs "BORDER="0"></A></TD><TDALIGN="CENTER"VALIGN="TOP"WIDTH="171"><ACLASS="book"HREF="index.htm"TITLE="UNIX Power Tools"><IMGSRC="gifs/txthome.gif"SRC="gifs/txthome.gif"ALT="UNIX Power Tools"BORDER="0"></A></TD><TDALIGN="RIGHT"VALIGN="TOP"WIDTH="172"><ACLASS="SECT1"HREF="ch40_10.htm"TITLE="40.10 nextday, nextweekday: Tomorrow or Next Weekday "><IMGSRC="gifs/txtnexta.gif"SRC="gifs/txtnexta.gif"ALT="Next: 40.10 nextday, nextweekday: Tomorrow or Next Weekday "BORDER="0"></A></TD></TR><TR><TDALIGN="LEFT"VALIGN="TOP"WIDTH="172">40.8 Automatically Restarting at Jobs </TD><TDALIGN="CENTER"VALIGN="TOP"WIDTH="171"><ACLASS="index"HREF="index/idx_0.htm"TITLE="Book Index"><IMGSRC="gifs/index.gif"SRC="gifs/index.gif"ALT="Book Index"BORDER="0"></A></TD><TDALIGN="RIGHT"VALIGN="TOP"WIDTH="172">40.10 nextday, nextweekday: Tomorrow or Next Weekday </TD></TR></TABLE><HRALIGN="LEFT"WIDTH="515"TITLE="footer"><IMGSRC="gifs/smnavbar.gif"SRC="gifs/smnavbar.gif"USEMAP="#map"BORDER="0"ALT="The UNIX CD Bookshelf Navigation"><MAPNAME="map"><AREASHAPE="RECT"COORDS="0,0,73,21"HREF="../index.htm"ALT="The UNIX CD Bookshelf"><AREASHAPE="RECT"COORDS="74,0,163,21"HREF="index.htm"ALT="UNIX Power Tools"><AREASHAPE="RECT"COORDS="164,0,257,21"HREF="../unixnut/index.htm"ALT="UNIX in a Nutshell"><AREASHAPE="RECT"COORDS="258,0,321,21"HREF="../vi/index.htm"ALT="Learning the vi Editor"><AREASHAPE="RECT"COORDS="322,0,378,21"HREF="../sedawk/index.htm"ALT="sed & awk"><AREASHAPE="RECT"COORDS="379,0,438,21"HREF="../ksh/index.htm"ALT="Learning the Korn Shell"><AREASHAPE="RECT"COORDS="439,0,514,21"HREF="../lrnunix/index.htm"ALT="Learning the UNIX Operating System"></MAP></DIV></BODY></HTML>⌨️ 快捷键说明
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