So, you are saying that the numbers in the input are essentially irrelevant. SSCCE:

#!/usr/bin/env perl 
use strict;
use warnings;

my @lines = <DATA>;
print shift @lines;
chomp @lines;
my $perline = 8;
my @num;
my @numline = (1 .. $perline);
my $fmt = '%s ' . '%5i' x $perline . "\n";
for my $line (@lines) {
    if ($line =~ /^1/) {
        print join ('   ', @num) . "\n";
        last;
    }
    printf $fmt, $line, @numline;
    push @num, @numline;
    $_ += $perline for @numline;
}

__DATA__
    a       b    c    d    e    f    g    h
aa
bb
cc
dd
aa
bb
cc
dd
aa
bb
cc
dd
1    2    3    4    5    6    7    8    9    10    11    12    13    1
+4    15    16

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In reply to Re^3: Cutting text from the end of the file and adding it to the top by hippo
in thread Cutting text from the end of the file and adding it to the top by oysterperl

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