Date: Mon, 17 Dec 2001 10:14:29 +0100 From: Cliff Sarginson <cliff@raggedclown.net> To: FreeBSD Questions <freebsd-questions@FreeBSD.ORG> Subject: Re: ping failure script Message-ID: <20011217091429.GA1352@raggedclown.net> In-Reply-To: <113fc9110004.110004113fc9@mbox.com.au> References: <113fc9110004.110004113fc9@mbox.com.au>
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On Mon, Dec 17, 2001 at 02:03:48PM +1100, BSD Freak wrote:
> Hi all,
>
> I want to run a shell script from cron that has the following logic
> but I am totally unsure where to start with the syntax. It goes like
> this:
>
> IF 3 consecutive pings to my.host.com fail THEN
> echo "Link is DOWN!!" | mail me@mycompany.com
> end
ping -q -c 3 -w 1 my.host.com >/dev/null
[ $? -ne 0 ] && { echo "Link is DOWN!!" | mail me@mycompany.com"; }
Only problem with this is that you will get the message consequent on the
effect of the last ping.
Perhaps you could better try it this way:
FAIL=0
for LOOP in 1 2 3
do
ping -q -c 1 -w 1 my.host.com >/dev/null
[ $? -eq 0 ] && { break; }
FAIL=$LOOP
done
case $LOOP in
0) :
;;
1|2) echo "Link is flaky" | mail me@mycompany.com;
;;
3) echo "Link is down" | mail me@mycompany.com;
;;
*) ;;
esac
So if ping number 1 succeeds all is assumed ok.
If ping 1 or 2 fail but ping 3 succeeds, there may be a problem
If all 3 pings fail assume your link is down.
But this is also not exactly what you asked for, may give you
a hint though.
--
Regards
Cliff
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