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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GNU dbm README
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* Introduction

This file contains brief information about configuring, testing
and using GNU dbm.  It is *not* intended as a replacement
for the documentation, instead it is provided as a brief reference
only. The complete documentation is available in doc/ subdirectory.
To read the manpage without installing the package use `man
doc/gdbm.3'.  To read texinfo documentation without installing the
package, run `info -f doc/gdbm.info'.  After the package is installed
the documentation can be accessed by running `man gdbm' and
`info gdbm'.

* Overview

GNU dbm is a set of database routines that use extendible hashing and
works similar to the standard UNIX dbm routines.  The library provides
also an optional compatibility layer for UNIX-like dbm and ndbm calls.

* Configuration

   a)  configure [PARAMETERS]
   b)  make 

For a list of generic PARAMETERS, see the file INCLUDE.  The gdbm-specific
parameters are:

** --enable-memory-mapped-io

Enable the use of mmap(2) for I/O optimizations.  This is the default,
if mmap is available.  To disable mmap, use --disable-memory-mapped-io.

** --enable-libgdbm-compat

Build and install libgdbm_compat, a compatibility layer which provides
UNIX-like dbm and ndbm interfaces.  It includes two header files:
dbm.h and ndbm.h, which are installed into $includedir.  If you wish
to install them elsewhere, define the variable COMPATINCLUDEDIR, e.g.

 ./configure --enable-libgdbm-compat COMPATINCLUDEDIR=/usr/include/gdbm

** --without-readline

Don't compile GNU Readline support.  By default, configure enables
line-editing support if GNU Readline is available on the system.

** --enable-gdbmtool-debug

This option instruments gdbmtool for additional debugging. Configured
with this option, gdbmtool accepts two additional arguments:
--lex-trace, which enables tracing the operation of the lexical
analyzer, and --gram-trace, which enables parser tracing output.

Note, that bison and flex must be installed for this option to take effect, 

* Installation 

  make install

This package also contains the 'magic' file for the file(1) utility -
src/gdbm.magic.  It is not installed by default, as its installation
location differs considerably between various distributions.  The most
straightforward (but not the best one) approach is appending its
content to /etc/magic:

  cat src/gdbm.magic >> /etc/magic

See the documentation in your distribution for detailed instructions
on how to install this file.
  
* Bug reporting

Please report bugs to <bug-gdbm@gnu.org>

* Documentation, updates etc.

For the latest updates, visit <http://www.gnu.org/software/gdbm>,

In particular, a copy of GDBM documentation in various formats is
available online at <http://www.gnu.org/software/gdbm/manual>.

Latest versions of GDBM can be downloaded from anonymous
ftp://ftp.gnu.org/gnu/gdbm.

To track the development, visit 
<http://puszcza.gnu.org.ua/projects/gdbm>.


* Copyright information:

Copyright (C) 2011, 2016-2018 Free Software Foundation, Inc.

   Permission is granted to anyone to make or distribute verbatim copies
   of this document as received, in any medium, provided that the
   copyright notice and this permission notice are preserved,
   thus giving the recipient permission to redistribute in turn.

   Permission is granted to distribute modified versions
   of this document, or of portions of it,
   under the above conditions, provided also that they
   carry prominent notices stating who last changed them.


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