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　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。 . Prv8 Shell

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Current File : //lib64/python2.7/Tools/scripts/rgrep.py

#! /usr/bin/python2.7

"""Reverse grep.

Usage: rgrep [-i] pattern file
"""

import sys
import re
import getopt

def main():
    bufsize = 64*1024
    reflags = 0
    opts, args = getopt.getopt(sys.argv[1:], "i")
    for o, a in opts:
        if o == '-i':
            reflags = reflags | re.IGNORECASE
    if len(args) < 2:
        usage("not enough arguments")
    if len(args) > 2:
        usage("exactly one file argument required")
    pattern, filename = args
    try:
        prog = re.compile(pattern, reflags)
    except re.error, msg:
        usage("error in regular expression: %s" % str(msg))
    try:
        f = open(filename)
    except IOError, msg:
        usage("can't open %s: %s" % (repr(filename), str(msg)), 1)
    f.seek(0, 2)
    pos = f.tell()
    leftover = None
    while pos > 0:
        size = min(pos, bufsize)
        pos = pos - size
        f.seek(pos)
        buffer = f.read(size)
        lines = buffer.split("\n")
        del buffer
        if leftover is None:
            if not lines[-1]:
                del lines[-1]
        else:
            lines[-1] = lines[-1] + leftover
        if pos > 0:
            leftover = lines[0]
            del lines[0]
        else:
            leftover = None
        lines.reverse()
        for line in lines:
            if prog.search(line):
                print line

def usage(msg, code=2):
    sys.stdout = sys.stderr
    print msg
    print __doc__
    sys.exit(code)

if __name__ == '__main__':
    main()

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