How to search and replace

[Terry Polzin]

On Thursday 02 February 2006 10:20, Dan Track wrote:
> Hi
>
> I thought I'd ask this here as you guys helped me setup mrtg :)
>
> I've got the following pattern in a text file in linux.
> Target[description1].1.3.4.6.5.3.:string at 10.11.8.10
> Directory[description1]: server1
>
> Target[description2].1.3.4.6.4.9.:string at 10.17.5.24
> Directory[description2]: server2
>
> What I would like to do is replace the ip of each with the following
> value of "Directory". So for example I would like
> Target[description1].1.3.4.6.5.3.:string at 10.11.8.10 to become
> Target[description1].1.3.4.6.5.3.:string at server1.example.com
>
> How can I accomplish this using either C,perl,sed or awk

sed s/string to change/replacement string/ < somefile > someotherfile
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