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Date:      Thu, 9 Nov 2000 09:14:42 -0700 (MST)
From:      Peter <peterk@americanisp.net>
To:        Daniel Bye <Daniel.Bye@uk.uu.net>
Cc:        freebsd-questions@freebsd.org
Subject:   RE: Crontabs
Message-ID:  <Pine.LNX.4.21.0011090911040.8440-100000@oxygen.americanisp.net>
In-Reply-To: <FB7CAC781DB6D311BEE800805FE6FADA2F4D74@camexch4.cam.uk.internal>

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> The easiest thing to do is to use the -c flag to ping.  This allows you
> to specify how many packets to send, then exits when done:

I know I can do that, but I was wondering can I make cron kill a job after
XX mins, or does it already do this? What if I have users that run a cron
job of ping yahoo.com every single min?

We will have solar energy as soon as the utility companies solve one
technical problem -- how to run a sunbeam through a meter.


--- www.nul.cjb.net --- The Power to Crash!
--- www.FreeBSD.org --- The Power to Serve!

On Thu, 9 Nov 2000, Daniel Bye wrote:

> The easiest thing to do is to use the -c flag to ping.  This allows you
> to specify how many packets to send, then exits when done:
> 
> [ecam082: danielby: ~]$ ping -c 5 www.uk.freebsd.org
> PING web008.pavilion.net (212.74.4.8): 56 data bytes
> 64 bytes from 212.74.4.8: icmp_seq=0 ttl=244 time=34.627 ms
> 64 bytes from 212.74.4.8: icmp_seq=1 ttl=244 time=20.867 ms
> 64 bytes from 212.74.4.8: icmp_seq=2 ttl=244 time=31.106 ms
> 64 bytes from 212.74.4.8: icmp_seq=3 ttl=244 time=22.631 ms
> 64 bytes from 212.74.4.8: icmp_seq=4 ttl=244 time=28.850 ms
> 
> --- web008.pavilion.net ping statistics ---
> 5 packets transmitted, 5 packets received, 0% packet loss
> round-trip min/avg/max/stddev = 20.867/27.616/34.627/5.162 ms
> 
> 
> 
> You can alter your crontab to log to a file, or better, write a wrapper
> script that does all of it - pinging the chosen host the chosen number 
> of times, and output that to a file.  Then you can call the script 
> from your crontab.
> 
> Dan
> 
> -----Original Message-----
> From: Peter [mailto:peterk@americanisp.net]
> Sent: 09 November 2000 15:43
> To: freebsd-questions@freebsd.org
> Subject: Crontabs
> 
> 
> I've not been able to find this in the crontab man pages (I skimmed could
> have missed it) but let's say I make a cron job of "ping yahoo.com," and
> since ping does not quit until you hit ctrl+c, will the cron job continue
> to run until I specifically kill it? If so under ps will it show as user
> bob pinging yahoo? or where will I find this under ps?  Does cron kill
> it's jobs after x mins? Can I configure it so it will?  (so I don't DoS
> myself thru runaways cronjobs).  Another question:  my sendmail crashes
> (signal 11, I need to remake it, I suppose) so cron can't send output to
> user, does this file/ouput get stored anywhere else?  TY.
> 
> 
> *** Fortune ***
> Albert Einstein, when asked to describe radio, replied: "You see, wire
> telegraph is a kind of a very, very long cat.  You pull his tail in New
> York and his head is meowing in Los Angeles.  Do you understand this?
> And radio operates exactly the same way: you send signals here, they
> receive them there.  The only difference is that there is no cat."
> 
> 
> --- www.nul.cjb.net --- The Power to Crash!
> --- www.FreeBSD.org --- The Power to Serve!
> 
> 
> 
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> 



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