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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 : //proc/thread-self/root/lib/python3.6/site-packages/cloudinit/distros/bsd_utils.py

# This file is part of cloud-init. See LICENSE file for license information.

import shlex

from cloudinit import util

# On NetBSD, /etc/rc.conf comes with a if block:
#   if [ -r /etc/defaults/rc.conf ]; then
# as a consequence, the file is not a regular key/value list
# anymore and we cannot use cloudinit.distros.parsers.sys_conf
# The module comes with a more naive parser, but is able to
# preserve these if blocks.


def _unquote(value):
    if value[0] == value[-1] and value[0] in ['"', "'"]:
        return value[1:-1]
    return value


def get_rc_config_value(key, fn="/etc/rc.conf"):
    key_prefix = "{}=".format(key)
    for line in util.load_file(fn).splitlines():
        if line.startswith(key_prefix):
            value = line.replace(key_prefix, "")
            return _unquote(value)


def set_rc_config_value(key, value, fn="/etc/rc.conf"):
    lines = []
    done = False
    value = shlex.quote(value)
    original_content = util.load_file(fn)
    for line in original_content.splitlines():
        if "=" in line:
            k, v = line.split("=", 1)
            if k == key:
                v = value
                done = True
            lines.append("=".join([k, v]))
        else:
            lines.append(line)
    if not done:
        lines.append("=".join([key, value]))
    new_content = "\n".join(lines) + "\n"
    if new_content != original_content:
        util.write_file(fn, new_content)

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