From owner-freebsd-questions  Sun Dec 16 22: 5: 5 2001
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Date: Mon, 17 Dec 2001 07:04:57 +0100
From: "Michal F. Hanula" <frankie@kyblik.pieskovisko.sk>
To: freebsd-questions@freebsd.org
Subject: Re: ping failure script
Message-ID: <20011217070457.A273@kyblik.pieskovisko.sk>
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In-Reply-To: <113fc9110004.110004113fc9@mbox.com.au>; from bsd-freak@mbox.com.au on Mon, Dec 17, 2001 at 02:03:48PM +1100
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On Mon, Dec 17, 2001 at 02:03:48PM +1100, BSD Freak wrote:
> Hi all,
>=20
> I want to run a shell script from cron that has the following logic=20
> but I am totally unsure where to start with the syntax. It goes like=20
> this:
>=20
> IF 3 consecutive pings to my.host.com fail  THEN
> echo "Link is DOWN!!" | mail me@mycompany.com
> end
>=20
>=20
> Thanks in advance....

#get the summary line (a packets transmitted, b packets received, c%
# packet loss)
PING_SUMMARY=3D$(ping -c ${COUNT} -t ${TIMEOUT}  -q ${IP} 2>&1 | tail -1 | =
head -1)

# get the ``b'' from the line
COUNT=3D$(expr "${PING_SUMMARY}":'.* \([0-9]*\) packets received')

#If it is 0, do what is needed.
if [ ${COUNT} -eq 0 ]; then
 echo "Link is DOWN!!!" | mail me@mycompany.com
fi

No time to test it, use at your own risk. HTH.
					(m&f)

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