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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Current File : //usr/share/doc/flex/README
This is flex, the fast lexical analyzer generator.

flex is a tool for generating scanners: programs which recognize
lexical patterns in text.

More information about flex as well as the latest official release of
flex can be found at:

http://flex.sourceforge.net/

The flex codebase is kept in git at:

https://github.com/westes/flex

Bugs and pull requests should be filed against flex using github's
issue tracker and pull request facilities.

There are several mailing lists available as well:

flex-announce@lists.sourceforge.net - where posts will be made
announcing new releases of flex.

flex-help@lists.sourceforge.net - where you can post questions about
using flex

flex-devel@lists.sourceforge.net - where you can discuss development of
flex itself

Find information on subscribing to the mailing lists at:

http://sourceforge.net/mail/?group_id=97492

The flex distribution contains the following files which may be of interest:

README - This file.
NEWS - current version number and list of user-visible changes.
INSTALL - basic installation information.
ABOUT-NLS - description of internationalization support in flex.
COPYING - flex's copyright and license.
doc/ - user documentation.
examples/ - containing examples of some possible flex scanners and a
	few other things. See the file examples/README for more details.
TODO - outstanding bug reports, desired features, etc.
tests/ - regression tests. See TESTS/README for details.
po/ - internationalization support files.

You need the following tools to build flex from the maintainer's
repository:

compiler suite - flex is built with gcc
bash, or a good Bourne-style shell
m4 - m4 -p needs to work; GNU m4 and a few others are suitable
GNU bison;  to generate parse.c from parse.y
autoconf; for handling the build system
automake; for Makefile generation
gettext; for i18n support
help2man; to generate the flex man page
tar, gzip, etc.; for packaging of the source distribution

GNU texinfo; to build and test the flex manual. Note that if you want
to build the dvi/ps/pdf versions of the documentation you will need
texi2dvi and related programs, along with a sufficiently powerful
implementation of \TeX to process them. See your operating system
documentation for how to achieve this. The printable versions of the
manual are not built unless specifically requested, but the targets
are included by automake.

GNU indent; for indenting the flex source the way we want it done

In cases where the versions of the above tools matter, the file
configure.ac will specify the minimum required versions.

Once you have all the necessary tools installed, life becomes
simple. To prepare the flex tree for building, run the script:

$ ./autogen.sh

in the top level of the flex source tree.
This script calls the various tools needed to get flex ready for the
GNU-style configure script to be able to work.

From this point on, building flex follows the usual configure, make,
make install routine.

This file is part of flex.

This code is derived from software contributed to Berkeley by
Vern Paxson.

The United States Government has rights in this work pursuant
to contract no. DE-AC03-76SF00098 between the United States
Department of Energy and the University of California.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:

1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.

Neither the name of the University nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.

THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE.

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