How to use dig with an ip list

[Fraser Tweedale]

On Mon, Aug 18, 2008 at 10:05:18PM -0500, Paul Schmehl wrote:
> --On August 19, 2008 12:44:05 PM +1000 Fraser Tweedale <frase at frase.id.au> 
> wrote:
> 
> > On Mon, Aug 18, 2008 at 09:03:36PM -0500, Paul Schmehl wrote:
> >> I know I'm missing the obvious.  I want to use an IP list to generate
> >> an  ip+hostname list.  IOW, I want to go from this:
> >>
> >> x.x.x.x
> >> y.y.y.y
> >>
> >> to this;
> >>
> >> x.x.x.x foo.domain.tld
> >> y.y..y.y bar.domain.tld
> >>
> >> What's the best/easiest way to do this?
> >>
> >> Paul Schmehl (pauls at utdallas.edu)
> >> Senior Information Security Analyst
> >> The University of Texas at Dallas
> >> http://www.utdallas.edu/ir/security/
> >
> > dig(1) - see section `MULTIPLE QUERIES'
> > note the -x flag to instruct dig to perform a reverse lookup
> >
> > see also host(1)
> >
> 
> That's not a great deal of help.  I, of course, had read and re-read the 
> man pages before posting the question here, and I'm quite familiar with 
> the "normal" use of dig and host, because I use them daily in my work.
> 
> The two options that man (1) dig provides are; on the commandline and in a 
> file.  I can easily generate a list of hostnames having constructed an 
> iplist in a file and then preceding each line with "dig +short -x IP" 
> using vi.  But that gives me a list of hostnames only.  What I'm looking 
> for is the combination of the two. host (1), of course, doesn't even have 
> *those* options, so it's of no use for accomplishing what I'm attempting.
> 
> Again, I want to start with a list of IPs and end up with a list of IPs 
> *plus* their hostnames (on the same line).  I'm quite sure someone here 
> has the experience and/or knowledge to do this using shell commands.  I 
> suspect awk might be helpful but haven't yet investigated that angle.
> 
> Paul Schmehl (pauls at utdallas.edu)
> Senior Information Security Analyst
> The University of Texas at Dallas
> http://www.utdallas.edu/ir/security/

how about

==================================
#!/bin/sh
while read LINE
do
	echo $LINE `dig +short -x $LINE`
done
===================================

whack that in a file, chmod +x it and cat in the IPs

HTH

frase
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