perl dbm文件转换

[perl]代码库

#-----------------------------
# download the following standalone program
#!/usr/bin/perl -w
# db2gdbm: converts DB to GDBM

use strict;

use DB_File;
use GDBM_File;

unless ( @ARGV == 2 )
{
	die "usage: db2gdbm infile outfile\n";
}

my ( $infile, $outfile ) = @ARGV;
my ( %db_in, %db_out );

# open the files
tie ( %db_in, 'DB_File', $infile )
or die "Can't tie $infile: $!";
tie ( %db_out, 'GDBM_File', $outfile, GDBM_WRCREAT, 0666 )
or die "Can't tie $outfile: $!";

# copy (don't use %db_out = %db_in because it's slow on big databases)
while ( my ( $k, $v ) = each %db_in )
{
	$db_out {$k} = $v;
}

# these unties happen automatically at program exit
untie %db_in;
untie %db_out;

#-----------------------------
#% db2gdbm /tmp/users.db /tmp/users.gdbm
#-----------------------------