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 : //lib64/python2.7/Demo/pdist/rrcs.py
#! /usr/bin/python2.7

"Remote RCS -- command line interface"

import sys
import os
import getopt
import string
import md5
import tempfile
from rcsclient import openrcsclient

def main():
    sys.stdout = sys.stderr
    try:
        opts, rest = getopt.getopt(sys.argv[1:], 'h:p:d:qvL')
        if not rest:
            cmd = 'head'
        else:
            cmd, rest = rest[0], rest[1:]
        if not commands.has_key(cmd):
            raise getopt.error, "unknown command"
        coptset, func = commands[cmd]
        copts, files = getopt.getopt(rest, coptset)
    except getopt.error, msg:
        print msg
        print "usage: rrcs [options] command [options] [file] ..."
        print "where command can be:"
        print "      ci|put      # checkin the given files"
        print "      co|get      # checkout"
        print "      info        # print header info"
        print "      head        # print revision of head branch"
        print "      list        # list filename if valid"
        print "      log         # print full log"
        print "      diff        # diff rcs file and work file"
        print "if no files are given, all remote rcs files are assumed"
        sys.exit(2)
    x = openrcsclient(opts)
    if not files:
        files = x.listfiles()
    for fn in files:
        try:
            func(x, copts, fn)
        except (IOError, os.error), msg:
            print "%s: %s" % (fn, msg)

def checkin(x, copts, fn):
    f = open(fn)
    data = f.read()
    f.close()
    new = not x.isvalid(fn)
    if not new and same(x, copts, fn, data):
        print "%s: unchanged since last checkin" % fn
        return
    print "Checking in", fn, "..."
    message = asklogmessage(new)
    messages = x.put(fn, data, message)
    if messages:
        print messages

def checkout(x, copts, fn):
    data = x.get(fn)
    f = open(fn, 'w')
    f.write(data)
    f.close()

def lock(x, copts, fn):
    x.lock(fn)

def unlock(x, copts, fn):
    x.unlock(fn)

def info(x, copts, fn):
    dict = x.info(fn)
    keys = dict.keys()
    keys.sort()
    for key in keys:
        print key + ':', dict[key]
    print '='*70

def head(x, copts, fn):
    head = x.head(fn)
    print fn, head

def list(x, copts, fn):
    if x.isvalid(fn):
        print fn

def log(x, copts, fn):
    flags = ''
    for o, a in copts:
        flags = flags + ' ' + o + a
    flags = flags[1:]
    messages = x.log(fn, flags)
    print messages

def diff(x, copts, fn):
    if same(x, copts, fn):
        return
    flags = ''
    for o, a in copts:
        flags = flags + ' ' + o + a
    flags = flags[1:]
    data = x.get(fn)
    tf = tempfile.NamedTemporaryFile()
    tf.write(data)
    tf.flush()
    print 'diff %s -r%s %s' % (flags, x.head(fn), fn)
    sts = os.system('diff %s %s %s' % (flags, tf.name, fn))
    if sts:
        print '='*70

def same(x, copts, fn, data = None):
    if data is None:
        f = open(fn)
        data = f.read()
        f.close()
    lsum = md5.new(data).digest()
    rsum = x.sum(fn)
    return lsum == rsum

def asklogmessage(new):
    if new:
        print "enter description,",
    else:
        print "enter log message,",
    print "terminate with single '.' or end of file:"
    if new:
        print "NOTE: This is NOT the log message!"
    message = ""
    while 1:
        sys.stderr.write(">> ")
        sys.stderr.flush()
        line = sys.stdin.readline()
        if not line or line == '.\n': break
        message = message + line
    return message

def remove(fn):
    try:
        os.unlink(fn)
    except os.error:
        pass

commands = {
        'ci': ('', checkin),
        'put': ('', checkin),
        'co': ('', checkout),
        'get': ('', checkout),
        'info': ('', info),
        'head': ('', head),
        'list': ('', list),
        'lock': ('', lock),
        'unlock': ('', unlock),
        'log': ('bhLRtd:l:r:s:w:V:', log),
        'diff': ('c', diff),
        }

if __name__ == '__main__':
    main()

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