Subject: Re: power management and related concerns
To: Steven M. Bellovin <>
From: Thomas E. Spanjaard <>
List: tech-kern
Date: 07/01/2006 15:11:28
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Steven M. Bellovin wrote:
> On Sat, 01 Jul 2006 13:18:27 +0000, "Thomas E. Spanjaard"
> <> wrote:
>>Steven M. Bellovin wrote:
>>>	temp=acpitemp	 >70*2	   /bin/shutdown -p now
>>>where the *2 indicates that it has to happen twice in a row.  A few more
>>>frills, like shell variables for each config line -- the 'temp' means that
>>>a script would be run with envstatd_temp set to the value.  A | at the
>>>start of the command would create a pipeline that would be fed the value
>>>on stdin, to permit easy real-time graphing programs.
>>Confusing, using mathematical symbols for other meanings. Isn't the 
>>how-many-times-or-how-long (as Jachym Holecek suggested) better off in a 
>>separate column (think inetd.conf syntax)? Come to think of it, 
>>inetd.conf is a viable example format for this.
> I thought about that; it's certainly one perspective.  Here, though, I
> assumed that it would rarely be used, in which case I'm imposing a burden
> on everything else.  The other option is something like '-n 2', but that
> might be even more confusing.

Hmm, but a crontab is similar to this as well, but allows you to use * 
in separate columns (so no binary operator use is associated with the 
symbol due to obvious distance between columns) in the case where you 
don't want to specify anything specific.

         Thomas E. Spanjaard

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