How to search and replace

[Paul Howarth]

Dan Track wrote:
> On 2/2/06, Paul Howarth <paul at city-fan.org> wrote:
> 
>>Dan Track wrote:
>>
>>>On 2/2/06, Paul Howarth <paul at city-fan.org> wrote:
>>>
>>>
>>>>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 -e '$b
>>>>  /^Target\[[^]]*\][.0-9]*:.*@[0-9.]*$/ {
>>>>    $!N
>>>>    s/^\(Target\[[^]]*\][.0-9]*:.*@\)[0-9.]*\nDirectory\[[^]]*\]:
>>>>\(.*\)$/\1\2.example.com/
>>>>    P;D
>>>>  }' textfile > output
>>>>
>>>
>>>
>>>Thanks for the reply. When I run it I get the following error:
>>
>>The long line starting with "s/" and ending with "example.com/" is a
>>single long line; make sure your mail client didn't add a newline.
>>
> 
> Ok I tried that, it seem to have fixed the "s" problem. But now I get
> the following:
> 
> sed -e '$b /^Target\[[^]]*\][.0-9]*:.*@[0-9.]*$/ {
> $!N
> s/^\(Target\[[^]]*\][.0-9]*:.*@\)[0-9.]*\nDirectory\[[^]]*\]:\(.*\)$/\1\2.example.com/
> P;D
> }' text_files/mrtg.cfg > text_files/mrtg.cfg.changed
> sed: can't find label for jump to `/^Target\[[^]]*\][.0-9]*:.*@[0-9.]*$/'

You joined the line at the start with the "$b" to the following line. 
There should have been a newline (or a semicolon) there.

Paul.