From: Adam Carter <adamcarter3@gmail.com>
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user] irritating cron habit : solved
Date: Mon, 21 Feb 2011 22:32:57 +1100 [thread overview]
Message-ID: <AANLkTimBsmROm+BVeRxEq_ZySA1CULxKrxXwjwjk2bf4@mail.gmail.com> (raw)
In-Reply-To: <20110221102343.GB24111@ksp.sk>
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>
> btw, if I need to check if the network is up in a script, I usually do
>
> ping -q -c1 -w4 some.remote.host >/dev/null 2>&1 &&
> command-to-run-if-remote-host-reachable
>
> It the advantage that it checks directly connection to the host
> you wish to connect to, so it also won't run the command if your network
> is up, but the remote host is inaccessible...
>
> If your server doesn't respond to pings, just use some other server
> (eg google's public dns 8.8.8.8)
>
Or you could use hping, which has the advantage that it tests the actual
service you want to use, rather than just the host it sits on;
sphinx adam # hping2 -c 1 -S -p 80 www.google.com >/dev/null 2>&1 && echo
"it worked"
it worked
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prev parent reply other threads:[~2011-02-21 11:34 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-20 14:04 [gentoo-user] irritating cron habit Philip Webb
2011-02-20 15:27 ` Florian Philipp
2011-02-20 18:18 ` Philip Webb
2011-02-21 5:39 ` [gentoo-user] irritating cron habit : solved Philip Webb
2011-02-21 10:23 ` YoYo Siska
2011-02-21 11:32 ` Adam Carter [this message]
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