72 lines
1.9 KiB
HTML
72 lines
1.9 KiB
HTML
<HTML>
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<HEAD>
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<TITLE>at(1)</TITLE>
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</HEAD>
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<BODY>
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<H1>at(1)</H1>
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<HR>
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<PRE>
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</PRE>
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<H2>NAME</H2><PRE>
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at, atrun - execute commands at a later time
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</PRE>
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<H2>SYNOPSIS</H2><PRE>
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<STRONG>at</STRONG> <EM>time</EM> [<EM>month</EM> <EM>day</EM>] [<EM>file</EM>]
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</PRE>
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<H2>EXAMPLES</H2><PRE>
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<STRONG>at</STRONG> <STRONG>2315</STRONG> <STRONG>Jan</STRONG> <STRONG>31</STRONG> <STRONG>myfile</STRONG>
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# Myfile executed Jan 31 at 11:15 pm
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<STRONG>at</STRONG> <STRONG>0900</STRONG> # Job input read from <EM>stdin</EM>
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<STRONG>at</STRONG> <STRONG>0711</STRONG> <STRONG>4</STRONG> <STRONG>29</STRONG> # Read from <EM>stdin</EM>, exec on April 29
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</PRE>
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<H2>DESCRIPTION</H2><PRE>
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<EM>At</EM> prepares a file to be executed later at the specified time by creating
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a special entry in /<EM>usr</EM>/<EM>spool</EM>/<EM>at</EM>. The program <EM>atrun</EM> should be started
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periodically, for example, every minute by <EM>cron</EM>. <EM>Atrun</EM> checks to see if
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any files in /<EM>usr</EM>/<EM>spool</EM>/<EM>at</EM> should now be run, and if so, it runs them and
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then puts them in /<EM>usr</EM>/<EM>spool</EM>/<EM>at</EM>/<EM>past</EM>. The name of the file created in
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/<EM>usr</EM>/<EM>spool</EM>/<EM>at</EM> by <EM>at</EM> is YY.DDD.HHMM.UU (where YY, DDD, HH, and MM give the
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time to execute and UU is a unique number). Note that when the command
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runs, it will not be able to use <EM>stdin</EM> or <EM>stdout</EM> unless specifically
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redirected. In the first example above, it might be necessary to put
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>/<EM>dev</EM>/<EM>log</EM> on some lines in the shell script <EM>myfile</EM>. The same holds for
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the commands typed directly to <EM>at</EM>.
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</PRE>
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<H2>SEE ALSO</H2><PRE>
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<STRONG><A HREF="../man8/cron.8.html">cron(8)</A></STRONG>.
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</PRE>
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</BODY>
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</HTML>
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