golden hour

/usr/lib/x86_64-linux-gnu/perl/5.30.0

File/Folder	Size	Actions
B	-
B.pm	28.78 KB
CORE	-
Compress	-
Config.pm	3.2 KB
Config.pod	248.97 KB
Config_git.pl	409 B
Config_heavy.pl	52.89 KB
Cwd.pm	21.43 KB
DB_File.pm	63.58 KB
Data	-
Devel	-
Digest	-
DynaLoader.pm	24.59 KB
Encode	-
Encode.pm	31.33 KB
Errno.pm	6.43 KB
Fcntl.pm	3.95 KB
File	-
Filter	-
GDBM_File.pm	2.03 KB
Hash	-
I18N	-
IO	-
IO.pm	1.42 KB
IPC	-
List	-
MIME	-
Math	-
NDBM_File.pm	3.01 KB
O.pm	4.19 KB
ODBM_File.pm	2.9 KB
Opcode.pm	15.53 KB
POSIX.pm	19.87 KB
POSIX.pod	74.31 KB
PerlIO	-
SDBM_File.pm	3.72 KB
Scalar	-
Socket.pm	36.19 KB
Storable.pm	48.61 KB
Sub	-
Sys	-
Tie	-
Time	-
Unicode	-
_h2ph_pre.ph	28.71 KB
asm	-
asm-generic	-
attributes.pm	15.97 KB
auto	-
bits	-
encoding.pm	22.41 KB
endian.ph	3.54 KB
errno.ph	23 B
features.ph	13.82 KB
gnu	-
lib.pm	5.99 KB
linux	-
machine	-
mro.pm	9.88 KB
ops.pm	997 B
re.pm	22.26 KB
signal.ph	3.33 KB
stdarg.ph	2.8 KB
stdc-predef.ph	840 B
stddef.ph	11.65 KB
sys	-
syscall.ph	86 B
sysexits.ph	1.26 KB
syslimits.ph	452 B
syslog.ph	85 B
threads	-
threads.pm	37.05 KB
wait.ph	83 B

Edit: SDBM_File.pm

package SDBM_File;

use strict;
use warnings;

require Tie::Hash;
require XSLoader;

our @ISA = qw(Tie::Hash);
our $VERSION = "1.15";

our @EXPORT_OK = qw(PAGFEXT DIRFEXT PAIRMAX);
use Exporter "import";

XSLoader::load();

__END__

=head1 NAME

SDBM_File - Tied access to sdbm files

=head1 SYNOPSIS

use Fcntl;   # For O_RDWR, O_CREAT, etc.
 use SDBM_File;

tie(%h, 'SDBM_File', 'filename', O_RDWR|O_CREAT, 0666)
   or die "Couldn't tie SDBM file 'filename': $!; aborting";

# Now read and change the hash
 $h{newkey} = newvalue;
 print $h{oldkey}; 
 ...

untie %h;

=head1 DESCRIPTION

C<SDBM_File> establishes a connection between a Perl hash variable and
a file in SDBM_File format.  You can manipulate the data in the file
just as if it were in a Perl hash, but when your program exits, the
data will remain in the file, to be used the next time your program
runs.

=head2 Tie

Use C<SDBM_File> with the Perl built-in C<tie> function to establish
the connection between the variable and the file.

tie %hash, 'SDBM_File', $basename, $modeflags, $perms;

tie %hash, 'SDBM_File', $dirfile,  $modeflags, $perms, $pagfilename;

C<$basename> is the base filename for the database.  The database is two
files with ".dir" and ".pag" extensions appended to C<$basename>,

$basename.dir     (or .sdbm_dir on VMS, per DIRFEXT constant)
    $basename.pag

The two filenames can also be given separately in full as C<$dirfile>
and C<$pagfilename>.  This suits for two files without ".dir" and ".pag"
extensions, perhaps for example two files from L<File::Temp>.

C<$modeflags> can be the following constants from the C<Fcntl> module (in
the style of the L<open(2)> system call),

O_RDONLY          read-only access
    O_WRONLY          write-only access
    O_RDWR            read and write access

If you want to create the file if it does not already exist then bitwise-OR
(C<|>) C<O_CREAT> too.  If you omit C<O_CREAT> and the database does not
already exist then the C<tie> call will fail.

O_CREAT           create database if doesn't already exist

C<$perms> is the file permissions bits to use if new database files are
created.  This parameter is mandatory even when not creating a new database.
The permissions will be reduced by the user's umask so the usual value here
would be 0666, or if some very private data then 0600.  (See
L<perlfunc/umask>.)

=head1 EXPORTS

SDBM_File optionally exports the following constants:

=over

=item *

C<PAGFEXT> - the extension used for the page file, usually C<.pag>.

=item *

C<DIRFEXT> - the extension used for the directory file, C<.dir>
everywhere but VMS, where it is C<.sdbm_dir>.

=item *

C<PAIRMAX> - the maximum size of a stored hash entry, including the
length of both the key and value.

=back

These constants can also be used with fully qualified names,
eg. C<SDBM_File::PAGFEXT>.

=head1 DIAGNOSTICS

On failure, the C<tie> call returns an undefined value and probably
sets C<$!> to contain the reason the file could not be tied.

=head2 C<sdbm store returned -1, errno 22, key "..." at ...>

This warning is emitted when you try to store a key or a value that
is too long.  It means that the change was not recorded in the
database.  See BUGS AND WARNINGS below.

=head1 SECURITY WARNING

B<Do not accept SDBM files from untrusted sources!>

The sdbm file format was designed for speed and convenience, not for
portability or security.  A maliciously crafted file might cause perl to
crash or even expose a security vulnerability.

=head1 BUGS AND WARNINGS

There are a number of limits on the size of the data that you can
store in the SDBM file.  The most important is that the length of a
key, plus the length of its associated value, may not exceed 1008
bytes.

See L<perlfunc/tie>, L<perldbmfilter>, L<Fcntl>

=cut