#--http://perldoc.perl.org/functions/tie.html 
# print out history file offsets
use NDBM_File;
tie(%HIST, 'NDBM_File', '/usr/lib/news/history', 1, 0);
while (($key,$val) = each %HIST) {
    print $key, ' = ', unpack('L',$val), "\n";
    }
untie(%HIST)

##</code><code>##

[Perl]# perl testTie1.pl
Can't locate NDBM_File.pm in @INC (@INC contains: /usr/lib/perl5/5.10.0/i386-lin
ux-thread-multi /usr/lib/perl5/5.10.0 /usr/local/lib/perl5/site_perl/5.10.0/i386
-linux-thread-multi /usr/local/lib/perl5/site_perl/5.10.0 /usr/lib/perl5/vendor_
perl/5.10.0/i386-linux-thread-multi /usr/lib/perl5/vendor_perl/5.10.0 /usr/lib/p
erl5/vendor_perl /usr/local/lib/perl5/site_perl/5.10.0/i386-linux-thread-multi /
usr/local/lib/perl5/site_perl/5.10.0 /usr/local/lib/perl5/site_perl /usr/lib/per
l5/site_perl .) at testTie1.pl line 2.

##</code><code>##

[prompt]#  find / -name "NDBM_File*"
[prompt]# perl -V

##</code><code>##

CPAN Terminal> m NDBM_File    
 1 Memoize::NDBM_File                  0.65     MJD       
 2 NDBM_File                           1.07     NWCLARK   
CPAN Terminal> install 2                        

Installing NDBM_File (1.07)
[ERROR] The core Perl 5.010000 module 'NDBM_File' can only be upgraded from 0 to 1.07 by Perl itself (perl-5.8.9.tar.gz). Aborting install.

*** Install log written to:
  /root/.cpanplus/install-logs/NDBM_File-1.07-1239814025.log