Thanks for all ,, you are very helpful people and you rae really saints of the perl
ya all of you are right i must choose a real life sitiuations and solve it
iam going to do 2 somthing iam going to read programming perl and also i will start in code to add domains in named.conf file and make zone file :)
if i find any thing itis difficult to me am going to ask monks and i knew all of you are great

Thanks