From owner-freebsd-ipfw  Tue Mar 27  6:39: 7 2001
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Date: Tue, 27 Mar 2001 09:46:17 -0500
From: Mikel <mikel@ocsinternet.com>
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To: "Rodney W. Grimes" <freebsd@gndrsh.dnsmgr.net>
Cc: Johnny Dang <johnny.dang@johnnydang.net>,
	FreeBSD IpFW <FREEBSD-IPFW@FreeBSD.ORG>
Subject: Re: Scripting with IPFW
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    Thankfully Philip kindly pointed out the awk syntax 11 hours prior and I took a
few minutes to rewrite the little play script to be exactly as you have presented
here, only I didn't feel it was worth reposting wasted bw. What would have been nice
for those of us who have only just started playing with awk; would have been to have
some one suggest a code byte on how to have this thing automagickally grab the
interface name from ifconfig.

"Rodney W. Grimes" wrote:

> > Hey man cool, hope you don't mind I had to try your script out and well I came
> > up with this...thanks for sending back the code byte...
> >
> > #!/bin/sh
> >
> > oif=`ifconfig fxp0 |grep inet | head -1 | awk '{print $2}'`
>
> Obviosly people have totally forgotten how to program in the
> language of awk, so instead use 2 other tools to do what could
> be done much cleaner:
>
>         oif=`ifconfig fxp0 | awk '/inet/ {print $2; exit}'`
>
> Remeber, that grep X | awk 'foo' can almost always be rewritten
> in a cleaner style as simply awk '/X/ foo'.
>
> > omask=`ifconfig fxp0 |grep inet | head -1 | awk '{print $4}'`
> > iif=`ifconfig rl0 |grep inet | head -1 | awk '{print $2}'`
> > imask=`ifconfig rl0 |grep inet | head -1 | awk '{print $4}'`
>
> The also seemed to have forgotten about doing common value
> replacement by variables (fxp0 and rl0 should be replaced
> by $something, which I would have called $iif, but that is
> in use for something I would have called $iip).
>
> New code:
> oif=fxp0
> iif=rl0
> oip=`ifconfig ${oif} | awk '/inet/ {print $2; exit}'`
> omask=`ifconfig ${oif} | awk '/inet/ {print $4; exit}'`
> iip=`ifconfig ${iif} | awk '/inet/ {print $2; exit}'`
> imask=`ifconfig ${iif} | awk '/inet/ {print $4; exit}'`
>
> onet=`cidr -q ${oif} -h ${omask} | awk '/network/ {print $3}'`
> inet=`cidr -q ${iif} -h ${imask} | awk '/network/ {print $3}'`
>
> >
> > onet=`cidr -q ${oif} -h ${omask} | grep network | awk '{print $3}'`
> > inet=`cidr -q ${iif} -h ${imask} | grep network | awk '{print $3}'`
> >
> > echo "onet=\"${onet}\""
> > echo "oif=\"${oif}\""
> > echo "omask=\"${omask}\""
> > echo
> > echo "inet=\"${inet}\""
> > echo "iif=\"${iif}\""
> > echo "imask=\"${imask}\""
> >
> >
> > Cheers,
> > Mikel
> >
> > PS: cidr is a neat little util found in /usr/ports/net/cidr
> >
> >
> > Johnny Dang wrote:
> >
> > > Thanks you all (especially UNIX, SCANNER, Mikel, and Scott)... That is why
> > > this FreeBSD is great... This line will do it (I can now base on this and
> > > change to fix my need)...
> > >
> > > ifconfig de0 | grep "inet" | head -1 | awk '{print $2}'
> > >
> > > Thanks to you all... But why the orginal commands from Linux won't work on
> > > FreeBSD?
> > >
> > > ifconfig de0 | grep "inet" | cut -d -f2 | cut -d " " -f1  ?
> > >
> > > Just for curiosity? Btw, I download the new RedHAT Wolverines and Mandrake
> > > 8.0 and those GUI look like Lindows now. But my boss likes it !!!!!
> > >
> > > ++++++++++++++++++++++++++++++++++++++++++++++++++
> > > "The instructions said to use Windows 98 or better,
> > > so I installed FreeBSD...It is working now!..."
> > > ++++++++++++++++++++++++++++++++++++++++++++++++++
> > > Johnny Dang <Johnny.Dang@johnnydang.net>
> > > Senior Network Engineer/MCSE + Internet
> > >
> > > To Unsubscribe: send mail to majordomo@FreeBSD.org
> > > with "unsubscribe freebsd-ipfw" in the body of the message
> >
> >
> > To Unsubscribe: send mail to majordomo@FreeBSD.org
> > with "unsubscribe freebsd-ipfw" in the body of the message
> >
>
> --
> Rod Grimes - KD7CAX @ CN85sl - (RWG25)               rgrimes@gndrsh.dnsmgr.net
>
> To Unsubscribe: send mail to majordomo@FreeBSD.org
> with "unsubscribe freebsd-ipfw" in the body of the message


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