See the following code:
it will duplicate the lines starting with "ip address" 
use strict;
use warnings;
open(FH,"data");
foreach(<FH>) {
   print $_;
   if ( $_ =~ m/^ip address/)   {print $_;}
}

[download]

--sugumar--

In reply to Re: How to duplicate lines by ungalnanban
in thread How to duplicate lines by ddrew78

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