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/grep/README
  Copyright (C) 1992, 1997-2002, 2004-2017 Free Software Foundation, Inc.

  Copying and distribution of this file, with or without modification,
  are permitted in any medium without royalty provided the copyright
  notice and this notice are preserved.

This is GNU grep, the "fastest grep in the west" (we hope).  All
bugs reported in previous releases have been fixed.  Many exciting new
bugs have probably been introduced in this revision.

GNU grep is provided "as is" with no warranty.  The exact terms
under which you may use and (re)distribute this program are detailed
in the GNU General Public License, in the file COPYING.

GNU grep is based on a fast lazy-state deterministic matcher (about
twice as fast as stock Unix egrep) hybridized with a Boyer-Moore-Gosper
search for a fixed string that eliminates impossible text from being
considered by the full regexp matcher without necessarily having to
look at every character.  The result is typically many times faster
than Unix grep or egrep.  (Regular expressions containing backreferencing
will run more slowly, however.)

See the files AUTHORS and THANKS for a list of authors and other contributors.

See the file INSTALL for compilation and installation instructions.
If there is no INSTALL file, this copy of the source code is intended
for expert hackers; please see the file README-hacking.

See the file NEWS for a description of major changes in this release.

See the file TODO for ideas on how you could help us improve grep.

See the file README-alpha for information on grep development and the CVS
  repository.

Send bug reports to bug-grep@gnu.org.

KNOWN BUGS:

Several tests in fmbtest.sh and foad1.sh fail under the cs_CZ.UTF-8 locale
and have been disabled.

The combination of -o and -i options is broken and the known failing cases
are disabled in foad1.sh

The option -i does not work properly in some multibyte locales such as
tr_TR.UTF-8 where the upper case and lower case forms of a character are not
necessarily of the same byte length.

A list of outstanding and resolved bugs can be found at:

        http://debbugs.gnu.org/cgi/pkgreport.cgi?package=grep

You can also browse the bug-grep mailing list archive at:

        http://lists.gnu.org/archive/html/bug-grep/

For any copyright year range specified as YYYY-ZZZZ in this package
note that the range specifies every single year in that closed interval.

haha - 2025