Date: Tue, 23 Feb 1999 21:29:18 +1000 From: Greg Black <gjb@comkey.com.au> To: Dan Busarow <dan@dpcsys.com> Cc: Hugh Blandford <hugh@island.net.au>, questions@FreeBSD.ORG Subject: Re: Changing large no. of DNS records Message-ID: <19990223112918.20129.qmail@alpha.comkey.com.au> In-Reply-To: <Pine.BSF.3.96.990222103438.6495G-100000@java.dpcsys.com> of Mon, 22 Feb 1999 10:38:37 PST References: <Pine.BSF.3.96.990222103438.6495G-100000@java.dpcsys.com>
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> > I'm changing IP addresses of a nameserver :(( I also need to change the MX
> > records in all my zone files. Is there a utility that I can make look in
> > each file in a directory and do the equivalent of a global search and replace.
>
> sed
>
> # cd /etc/namedb
> # for i in db.*
> # do
> # sed -f sedfile $i > $i.out
> # mv $i $i.save
> # mv $i.out $i
> # done
>
> # cat sedfile
> s/IN MX 10 mail.my.domain./IN MX 10 newmail.my.domain./g
The basic concept is okay, but sed is definitely the wrong tool
here. Since he wants to edit files in place, the correct tool
is ed -- that way you avoid all the silly creation of the .out
files and the subsequent renaming:
for f in db.* ; do ed -s $f < edfile ; done
And edfile is something like this:
/MX 10 mail.my.domain/s//MX 10 newmail.my.domain/
wq
Of course, for both the sed and ed solutions, the actual REs
that you use will probably have to be a little more complex,
since it's not at all likely that you could rely on the files
being so consistent as these trivial examples show. But that's
just an exercise.
--
Greg Black <gjb@acm.org>
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