Library (
                  0 -> [all the data from the file which starts with a value
                        between 1 and n]
                  1 -> [all the data from the file which starts with a value
                        between n and 2n]
                  ....
                  7 -> [all the data from the file which starts with a value
                        between 7n and 8n]
                 );

##</code><code>##

#!/usr/local/bin/perl -w
use strict;
use Data::Dumper;

my @column_info = ([ 1024, 1067 ],     # Column 1 start stop
                   [ 1068, 1093 ],     # Column 2 start stop
                   [ 1094, 1137 ],     # Column 3 start stop
                   [ 1138, 1163 ],     # Column 4 start stop
                   [ 1164, 1207 ],     # Column 5 start stop
                   [ 1208, 1233 ],     # Column 6 start stop
                   [ 1234, 1277 ],     # Column 7 start stop
                   [ 1278, 1321 ] );   # Column 8 start stop

        # Note that we don't have to cat this to read the data.
        # We can just open for reading, hence the "<".
        # Note also that we check the return value for open.
        # This is very very important.
open(IN, "< /tmp/show_library.$$")
        or die "Failed to open /tmp/show_library.$$ for reading:  $!";

my @Library;
LINE: while(<IN>)
{
        s/^ //;         # works on $_ by default.
        chomp;

                        # split on spaces and take the first value
        my $column = (split(' ', $_))[0];

        for(my $i=0; $i < @column_info; $i++)
        {
                my ($start, $stop) = @{$column_info[$i]};

                        # if this is the right range, put it in our library
                if($column >= $start && $column <= $stop)
                {
                        push @{$Library[$i]}, $_;
                        next LINE;
                }
        }
                # If we've got to here we haven't found the range for
                # this entry.  We can do whatever we like, but here I
                # push it on to the very last element of Library, after
                # the final range value
        push @{$Library[@Library]}, $_;
}

# To verify we have the data structure we wanted:
print STDERR Dumper(@Library);

# Note that the entries are not sorted by their inserted value.
# That isn't too hard to resolve.
foreach my $entry (@Library)
{
        @$entry = sort {(split(' ', $a))[0] <=> (split(' ',$b))[0]} @$entry;
}

# To verify we have the ordering we wanted:
print STDERR Dumper(@Library);