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196 lines
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<H4>By James T. Dennis,
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LinuxCare,
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<H3 align="left"><img src="../../gx/dennis/qbubble.gif"
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height="50" width="60" alt="(?) " border="0"
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>Simple Shell and Cron Question</H3>
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<p><strong>From Amir Shakib Manesh on Thu, 08 Jun 2000
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</strong></p>
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<!-- ::
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Simple Shell and Cron Question
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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:: -->
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<P><STRONG>
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Dear ANswer Duy,
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I want to write a shell script, in which every 15 minutes it run a simple
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command, let say 'top <TT>-b</TT>'.
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Would you help me?
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</STRONG></P>
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<BLOCKQUOTE><IMG SRC="../../gx/dennis/bbub.gif" ALT="(!)"
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HEIGHT="28" WIDTH="50" BORDER="0"
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>
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Well one way would be to make a cron entry like:
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</BLOCKQUOTE>
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<blockquote><pre>*/15 * * * * top -b
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</pre></blockquote>
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<BLOCKQUOTE>
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... which you'd do by just issuing the command: 'crontab <TT>-e</TT>'
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from your shell prompt. That should put you in an editor from
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which you can type this command.
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</BLOCKQUOTE>
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<P><STRONG><IMG SRC="../../gx/dennis/qbub.gif" ALT="(?)"
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HEIGHT="28" WIDTH="50" BORDER="0"
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>
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Also is there any way to prevent from auto-log out in unix?
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</STRONG></P>
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<P><STRONG>
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Sincerely,
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</STRONG></P>
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<P><STRONG>
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Amir Shakib-Manesh
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</STRONG></P>
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<BLOCKQUOTE><IMG SRC="../../gx/dennis/bbub.gif" ALT="(!)"
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HEIGHT="28" WIDTH="50" BORDER="0"
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>
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UNIX and Linux don't have an "auto-log out" mechanism by default.
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So if you are getting logged out after some period of inactivity
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then the details of how you'd bypass that depend on the mechanism
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that's being used by your sysadmins. Ask them.
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</BLOCKQUOTE>
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<BLOCKQUOTE>
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(Other than that one of the possibilities is that they are setting
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a special variable in your shell, like TMOUT in bash. Read the
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bash man pages and search on TMOUT to see on that works. There are
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similar features in some other shells. That's a pretty common and
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relatively harmless way to encourage users not to leave their
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prompts unattended. Other methods involve some daemon like "idled"
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which runs as 'root' and watches for inactivity, pouncing on
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line hogs with 'kill' signals).
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</BLOCKQUOTE>
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<P> <hr> </p>
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<H5 align="center"><a href="http://www.linuxgazette.com/copying.html"
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>Copyright ©</a> 2000, James T. Dennis
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<BR>Published in <I>The Linux Gazette</I> Issue 55 July 2000</H5>
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