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

#extract column with unpack
$a = "To be or not to be";
$b = unpack("x6 A6", $a);  #skip 6, grab 6
print $b;

($b, $c) = unpack("x6 A2 x5 A2", $a);   #forward 6, grab 2; backward 5
+, grab 2
print "$b\n$c\n";

[download]

7.pl
errors:

Global symbol "$c" requires explicit package name at 7.pl line 10.

Global symbol "$c" requires explicit package name at 7.pl line 11.

Execution of 7.pl aborted due to compilation errors.
Ok i will use diagnostics, thank you; this examples are from a book, there is more than one, and don't know if the book has a resolution or if it's mistaken...

In reply to example 7.pl by Raymond

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