Date: Fri, 26 Dec 1997 23:46:47 +0000 From: Brian Somers <brian@awfulhak.org> To: Greg Lehey <grog@lemis.com> Cc: Nick Holshouser <nickh@ncnatural.com>, "Robert J. Lynn Jr." <root@techster.dyn.ml.org>, freebsd-questions@freebsd.org Subject: Re: How do you get pppd to save ip to file? Message-ID: <199712262346.XAA09365@awfulhak.demon.co.uk> In-Reply-To: Your message of "Fri, 26 Dec 1997 14:47:30 %2B1030." <19971226144730.39862@lemis.com>
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> On Thu, Dec 25, 1997 at 10:44:18PM -0500, Nick Holshouser wrote:
> > this works for me:
> > netstat -rn | tail -1 | awk '{print $2}' > file
>
> That's mainly luck. You're taking the last line of the netstat
> output, but you can't rely on the netstat output to be in any
> particular order.
Worse than that, it's in order based on the destination address.
> I didn't answer this question the first time round because I didn't
> understand it. If you're just looking for the IP address of a
> specific interface, such as your end of your PPP link, you could do
> something like
>
> # ifconfig ppp0 | grep inet | awk '{print $2}' > file
>
> Use 'tun0' instead of 'ppp0' if you're using user PPP. If you have
> more than one link, of course, this sort of breaks down.
>
> > note: on my systems netstat nicely puts the line with my IP on the
> > bottom, so tail -1 works.
>
> Do you have a trick to ensure this?
I can't say for pppd, but with ppp, a simple
! /usr/local/bin/setIP MYADDR
will do the job. Be careful, stdin, stdout and stderr are *not*
available to `setIP', and you *must* have '#! /bin/sh' or similar at
the top of `setIP'. The script may, for example be:
#! /bin/sh
echo $1 >/tmp/myfile
You may alternatively want to use `!bg /usr/local/bin/setIP MYADDR'
so that ppp doesn't wait for the command to complete.
> Greg
--
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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