晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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#!/usr/bin/perl

# Name:		dbinfo -- identify berkeley DB version used to create 
#			  a database file
#
# Author:	Paul Marquess  <Paul.Marquess@btinternet.com>
# Version: 	1.06 
# Date		27th March 2008
#
#     Copyright (c) 1998-2012 Paul Marquess. All rights reserved.
#     This program is free software; you can redistribute it and/or
#     modify it under the same terms as Perl itself.

# Todo: Print more stats on a db file, e.g. no of records
#       add log/txn/lock files

use strict ;

my %Data =
	(
	0x053162 =>	# DB_BTREEMAGIC
            {
			  Type 	   => "Btree",
			  Versions => # DB_BTREEVERSION
				{
				  1	=> [0, "Unknown (older than 1.71)"],
				  2	=> [0, "Unknown (older than 1.71)"],
				  3	=> [0, "1.71 -> 1.85, 1.86"],
				  4	=> [0, "Unknown"],
				  5	=> [0, "2.0.0 -> 2.3.0"],
				  6	=> [0, "2.3.1 -> 2.7.7"],
				  7	=> [0, "3.0.x"],
				  8	=> [0, "3.1.x -> 4.0.x"],
				  9	=> [1, "4.1.x or greater"],
				}
			},
	0x061561 => 	# DB_HASHMAGIC
            {
			  Type     => "Hash",
			  Versions => # DB_HASHVERSION
				{
				  1	=> [0, "Unknown (older than 1.71)"],
        			  2     => [0, "1.71 -> 1.85"],
        			  3     => [0, "1.86"],
        			  4     => [0, "2.0.0 -> 2.1.0"],
        			  5     => [0, "2.2.6 -> 2.7.7"],
        			  6     => [0, "3.0.x"],
				  7	=> [0, "3.1.x -> 4.0.x"],
				  8	=> [1, "4.1.x or greater"],
				  9	=> [1, "4.6.x or greater"],
				}
			},
	0x042253 => 	# DB_QAMMAGIC
            {
			  Type     => "Queue",
			  Versions => # DB_QAMVERSION
				{
				  1	=> [0, "3.0.x"],
				  2	=> [0, "3.1.x"],
				  3	=> [0, "3.2.x -> 4.0.x"],
				  4	=> [1, "4.1.x or greater"],
				}
			},
	) ;

die "Usage: dbinfo file\n" unless @ARGV == 1 ;

print "testing file $ARGV[0]...\n\n" ;
open (F, "<$ARGV[0]") or die "Cannot open file $ARGV[0]: $!\n" ;

my $buff ;
read F, $buff, 30 ;


my (@info) = unpack("NNNNNNC", $buff) ;
my (@info1) = unpack("VVVVVVC", $buff) ;
my ($magic, $version, $endian, $encrypt) ;

if ($Data{$info[0]}) # first try DB 1.x format, big endian
{
    $magic = $info[0] ;
    $version = $info[1] ;
    $endian  = "Big Endian" ;
    $encrypt = "Not Supported";
}
elsif ($Data{$info1[0]}) # first try DB 1.x format, little endian
{
    $magic = $info1[0] ;
    $version = $info1[1] ;
    $endian  = "Little Endian" ;
    $encrypt = "Not Supported";
}
elsif ($Data{$info[3]}) # next DB 2.x big endian
{
    $magic = $info[3] ;
    $version = $info[4] ;
    $endian  = "Big Endian" ;
}
elsif ($Data{$info1[3]}) # next DB 2.x little endian
{
    $magic = $info1[3] ;
    $version = $info1[4] ;
    $endian  = "Little Endian" ;
}
else
  { die "not a Berkeley DB database file.\n" }

my $type = $Data{$magic} ;
$magic = sprintf "%06X", $magic ;

my $ver_string = "Unknown" ;

if ( defined $type->{Versions}{$version} )
{
     $ver_string = $type->{Versions}{$version}[1];
     if ($type->{Versions}{$version}[0] )
       { $encrypt = $info[6] ? "Enabled" : "Disabled" }
     else
       { $encrypt = "Not Supported" }
}

print <<EOM ;
File Type:		Berkeley DB $type->{Type} file.
File Version ID:	$version
Built with Berkeley DB:	$ver_string
Byte Order:		$endian
Magic:			$magic
Encryption:             $encrypt
EOM

close F ;

exit ;

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