golden hour

/usr/share/perl5

File/Folder	Size	Actions
AnyDBM_File.pm	2.56 KB
App	-
Archive	-
Attribute	-
AutoLoader.pm	14.66 KB
AutoSplit.pm	19.18 KB
B	-
Benchmark.pm	27.87 KB
CORE.pod	2.7 KB
CPAN	-
CPAN.pm	132.91 KB
Class	-
Compress	-
Config	-
DB.pm	18.43 KB
DBM_Filter	-
DBM_Filter.pm	14.06 KB
Devel	-
DirHandle.pm	1.52 KB
Dumpvalue.pm	16.5 KB
Encode	-
English.pm	4.34 KB
ExtUtils	-
File	-
FileCache.pm	5.44 KB
FileHandle.pm	6.62 KB
Filter	-
FindBin.pm	4.45 KB
Getopt	-
HTTP	-
I18N	-
IO	-
IPC	-
JSON	-
LWP	-
LWP.pm	21.15 KB
Locale	-
Log	-
Math	-
Memoize	-
Memoize.pm	34.4 KB
Module	-
NEXT.pm	18.05 KB
Net	-
Object	-
Package	-
Perl	-
PerlIO	-
PerlIO.pm	10.19 KB
Pod	-
Safe.pm	24.03 KB
Search	-
SelectSaver.pm	1.05 KB
SelfLoader.pm	16.97 KB
Symbol.pm	4.68 KB
Term	-
Test	-
Test.pm	28.13 KB
Text	-
Thread	-
Thread.pm	8.09 KB
Tie	-
Time	-
UNIVERSAL.pm	6.97 KB
URI	-
URI.pm	33.01 KB
Unicode	-
User	-
Version	-
XSLoader.pm	9.99 KB
_charnames.pm	29.8 KB
autouse.pm	4.14 KB
base.pm	6.37 KB
bigint.pm	17.44 KB
bignum.pm	18.23 KB
bigrat.pm	14.11 KB
blib.pm	2.04 KB
bytes.pm	2.96 KB
bytes_heavy.pl	758 B
charnames.pm	19.22 KB
deprecate.pm	3.01 KB
diagnostics.pm	17.96 KB
dumpvar.pl	14.96 KB
encoding	-
feature.pm	11.06 KB
fields.pm	9.28 KB
filetest.pm	3.91 KB
if.pm	1.13 KB
integer.pm	3.19 KB
less.pm	3.13 KB
locale.pm	2.72 KB
lwpcook.pod	9.05 KB
lwptut.pod	24.89 KB
open.pm	7.83 KB
overload	-
overload.pm	52.66 KB
overloading.pm	1.77 KB
perl5db.pl	302.79 KB
perlfaq.pm	94 B
pod	-
sigtrap.pm	7.46 KB
sort.pm	5.95 KB
strict.pm	3.84 KB
subs.pm	845 B
unicore	-
utf8.pm	7.6 KB
utf8_heavy.pl	30.1 KB
vars.pm	2.3 KB
vendor_perl	-
vmsish.pm	4.22 KB
warnings	-
warnings.pm	18.34 KB

Edit: AnyDBM_File.pm

package AnyDBM_File;
use warnings;
use strict;

use 5.006_001;
our $VERSION = '1.01';
our @ISA = qw(NDBM_File DB_File GDBM_File SDBM_File ODBM_File) unless @ISA;

my $mod;
for $mod (@ISA) {
    if (eval "require $mod") {
	@ISA = ($mod);	# if we leave @ISA alone, warnings abound
	return 1;
    }
}

die "No DBM package was successfully found or installed";

__END__

=head1 NAME

AnyDBM_File - provide framework for multiple DBMs

NDBM_File, DB_File, GDBM_File, SDBM_File, ODBM_File - various DBM implementations

=head1 SYNOPSIS

use AnyDBM_File;

=head1 DESCRIPTION

This module is a "pure virtual base class"--it has nothing of its own.
It's just there to inherit from one of the various DBM packages.  It
prefers ndbm for compatibility reasons with Perl 4, then Berkeley DB (See
L<DB_File>), GDBM, SDBM (which is always there--it comes with Perl), and
finally ODBM.   This way old programs that used to use NDBM via dbmopen()
can still do so, but new ones can reorder @ISA:

BEGIN { @AnyDBM_File::ISA = qw(DB_File GDBM_File NDBM_File) }
    use AnyDBM_File;

Having multiple DBM implementations makes it trivial to copy database formats:

use Fcntl; use NDBM_File; use DB_File;
    tie %newhash,  'DB_File', $new_filename, O_CREAT|O_RDWR;
    tie %oldhash,  'NDBM_File', $old_filename, 1, 0;
    %newhash = %oldhash;

=head2 DBM Comparisons

Here's a partial table of features the different packages offer:

odbm    ndbm    sdbm    gdbm    bsd-db
			 ----	 ----    ----    ----    ------
 Linkage comes w/ perl   yes     yes     yes     yes     yes
 Src comes w/ perl       no      no      yes     no      no
 Comes w/ many unix os   yes     yes[0]  no      no      no
 Builds ok on !unix      ?       ?       yes     yes     ?
 Code Size               ?       ?       small   big     big
 Database Size           ?       ?       small   big?    ok[1]
 Speed                   ?       ?       slow    ok      fast
 FTPable                 no      no      yes     yes     yes
 Easy to build          N/A     N/A      yes     yes     ok[2]
 Size limits             1k      4k      1k[3]   none    none
 Byte-order independent  no      no      no      no      yes
 Licensing restrictions  ?       ?       no      yes     no

=over 4

=item [0]

on mixed universe machines, may be in the bsd compat library,
which is often shunned.

=item [1]

Can be trimmed if you compile for one access method.

=item [2]

See L<DB_File>. 
Requires symbolic links.

=item [3]

By default, but can be redefined.

=back

=head1 SEE ALSO

dbm(3), ndbm(3), DB_File(3), L<perldbmfilter>

=cut