Date: Sun, 16 Dec 2001 20:19:31 -0800 From: "Crist J . Clark" <cjc@FreeBSD.ORG> To: Ryan Thompson <ryan@sasknow.com> Cc: BSD Freak <bsd-freak@mbox.com.au>, FreeBSD Questions <freebsd-questions@FreeBSD.ORG> Subject: Re: ping failure script Message-ID: <20011216201931.E15624@blossom.cjclark.org> In-Reply-To: <20011216211234.Y12124-100000@catalyst.sasknow.net>; from ryan@sasknow.com on Sun, Dec 16, 2001 at 09:31:53PM -0600 References: <113fc9110004.110004113fc9@mbox.com.au> <20011216211234.Y12124-100000@catalyst.sasknow.net>
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On Sun, Dec 16, 2001 at 09:31:53PM -0600, Ryan Thompson wrote:
> BSD Freak wrote to FreeBSD Questions:
>
> > 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
>
> How about this?
>
> #!/bin/sh
>
> PING="/sbin/ping -q -c 3"
>
> if $PING $1 >/dev/null 2>&1; then
> echo "$1 is up"
> else
> echo "$1 is down"
> fi
>
>
> ping will only fail if no replies are received.
> The above example could use some better input error handling,
> but otherwise, it should do what you want.
Nope, ping(1) will never die if it doesn't get the responses. You need
to add the '-w' option. Something like,
PING="/sbin/ping -q -c 3 -w 10"
Should do it.
--
"It's always funny until someone gets hurt. Then it's hilarious."
Crist J. Clark | cjclark@alum.mit.edu
| cjclark@jhu.edu
http://people.freebsd.org/~cjc/ | cjc@freebsd.org
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