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Full Discussion: How to convert forward zone file to reverse
Top Forums Shell Programming and Scripting How to convert forward zone file to reverse Post 302281956 by cfajohnson on Thursday 29th of January 2009 10:36:23 PM
Old 01-29-2009
Quote:
Originally Posted by mosavani
I have forward dns zone file with A records and converting it to reverse zone file
ex.

subdomain1 A 10.20.30.40
subdomain2 A 10.20.31.41
subdomain3 A 10.20.35.43
subdomain4 A 10.20.30.41
subdomain5 A 10.20.30.42

Need to convert reverse like:

10.20.30.40
40 PTR subdomain1.domain.com
41 PTR subdomain4.domain.com
42 PTR subdomain5.domain.com
10.20.31.41
41 PTR subdomain2.domain.com
10.20.35.43
43 PTR subdomain3.domain.com

I am doing this with below command but not satisfied, I know there is better way to do this but need right direction.

I doubt that you are doing it with the script you posted; there are errors in that script. When posting code, use the exact code. Cut and paste it, do not retype it.
Quote:

Code:
for line in $(cat zonefile );


That is almost always the wrong way to read a file.

You are not reading it a line at a time, but a word at a time.

Use a while loop:

Code:
while IFS= read -r line
do
  : ...
done < zonefile

Quote:
Code:
do
        name = $(echo $line | cut -d' ' -f1)
        IP = $(echo $line | cut -d. -f4)


There must be no spaces around the equals signs.

You do not need an external command to split a line. Use the shell's parameter expansion or IFS and set:

Code:
name=${line%% *}
set -f; IFS=.; set -- $line
shift $(( $# - 1 ))
IP=$4

Quote:
Code:
        echo -e "$IP \t PTR \t $name.domanin.com"
done

 

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