Sorry, but your question doesn't make sense. Should it print # input 1 if any of the other inputs have the same string on line 3? Because in that case you might switch the whole thing around and just look for unique occurences of line 3 and print everything else. Please provide some more information on what you want exactly as well as some code you've already tried.
update to prevent the question thread going 16 levels deep: how about something like: (untested code alert) 
use strict;
use warnings;

my $FH = *insert your filehandle stuff here*;
my $linecounter = 0;
my $headerline;

while(my $line = <$FH>)
  {
  chomp($line); #not sure if needed...
  unless(my $modulo = ($linecounter % 4))
    { $headerline = $line; }
  elsif(($modulo == 3) && ($line eq 'ord'))
    { print "$headerline\n"; }
  $linecounter += 1;
  }

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Remember rule one...

In reply to Re: print matching lines by Forsaken
in thread print matching lines by Anonymous Monk

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