Date: Wed, 20 Dec 2000 23:38:56 -0800 From: Doug Barton <DougB@gorean.org> To: Alex Blagoveschensky <alex@belpak.by> Cc: Dave Wilson <davew@sai.co.za>, freebsd-isp@FreeBSD.ORG Subject: Re: Off topic - shell skills Message-ID: <3A41B390.2250BB12@gorean.org> References: <NEBBJFIIGKGLPEBIJACLKEIJCJAA.davew@sai.co.za> <3A3DDE15.D8E377A9@belpak.by>
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For future reference, this doesn't belong on -isp. It's really
-questions material.
Alex Blagoveschensky wrote:
> Try this. But what will you do with Serial in SOA ? ;-)
Easy, see below.
> #!/bin/sh
> for i in *
> do
> echo $i
> cat $i | sed 's/10\.1\.1\.58/10\.0\.0\.1/' >$$
This is the prototypical "useless use of cat." You can call sed with
the file as an argument. Also, naming a temp file by the pid can lead to
confusion later if your process gets interrupted.
> mv $$ $i
Dangerous... what happens if your sed doesn't complete successfully?
> done
There are probably some flaws with the script below, but I use it all
the time. In fact, I don't even bother to put it in a file anymore, I
can type it out faster. :) Let's assume that you have your serial
numbers on a line in the zone file that looks like this:
2000120101 ; Serial
#!/bin/sh
for file in *; do
echo $file
sed -e 's/[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9].*Serial/2000122101 ; Serial/' \
-e 's/10\.1\.1\.58/10\.0\.0\.1/' > $file.sed &&
mv $file.sed $file
done
Obviously the pattern matching for the serial number itself
could be simpler if you are confident you don't have any unusual
instances...
Doug
--
"The most difficult thing in the world is to know how to do a thing and
to watch someone else do it wrong without comment."
-- Theodore H. White
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