Date: Thu, 05 Feb 1998 07:37:51 +0000 From: Brian Somers <brian@Awfulhak.org> To: Kwoody <kwoody@citytel.net> Cc: Brian Somers <brian@Awfulhak.org>, freebsd-questions <freebsd-questions@FreeBSD.ORG> Subject: Re: small script question.. Message-ID: <199802050737.HAA06685@awfulhak.org> In-Reply-To: Your message of "Wed, 04 Feb 1998 11:14:27 PST." <Pine.BSF.3.91.980204105901.26597C-100000@mybsd.net>
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>
>
> On Wed, 4 Feb 1998, Brian Somers wrote:
>
> > > echo "not found"
> > > echo "running ppp..."
> > > ppp -auto -alias city
> > > fi
> > [.....]
> >
> > or:
> >
> > #! /bin/sh
> > killall -0 ppp || ppp -auto -alias city
> >
>
> I dont want to kill it if its already running. I just want to check if
> ppp is running if not then run it.
>
> Though I think I see what it does. It kills ppp and any other process's
> it spawned. If ppp was not running at the time, killall would fail
> and then run the next statement.
>
> But what if ppp is running? Killall would kill ppp then (now I'm guessing
> here) since it killed it it says done killed, but then ppp will not be
> running cause killall was successful so the next statement does not get
> executed.
>
> Or am I way off base here?
The signal 0 is special. It doesn't send anything to the process -
it just tells you if it can be delivered.
--
Brian <brian@Awfulhak.org>, <brian@FreeBSD.org>, <brian@OpenBSD.org>
<http://www.Awfulhak.org>;
Don't _EVER_ lose your sense of humour....
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