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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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Directory : /lib64/pm-utils/sleep.d/

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Current File : //lib64/pm-utils/sleep.d/56dhclient

#!/bin/sh
# If we are running dhclient, shutdown running instances cleanly and
# bring them back up on resume.

. "${PM_FUNCTIONS}"

PM_DHCLIENT_RUNDIR="${PM_UTILS_RUNDIR}/network"
PM_DHCLIENT_SUSPEND="${PM_DHCLIENT_RUNDIR}/dhclient.suspend"

suspend_dhclient() {
    [ ! -d /etc/sysconfig/network-scripts ] && return
    [ ! -x /sbin/ifdown ] && return

    [ ! -d ${PM_DHCLIENT_RUNDIR} ] && /bin/mkdir -p ${PM_DHCLIENT_RUNDIR}
    [ -f ${PM_DHCLIENT_SUSPEND} ] && /bin/rm -f ${PM_DHCLIENT_SUSPEND}

    cd /etc/sysconfig/network-scripts
    for ifcfg in ifcfg-* ; do
        # Clear relevant parameters set by previous interface
        # (lo doesn't set them)
        NM_CONTROLLED=
        BOOTPROTO=

        . ./"${ifcfg}"

        if [ "${NM_CONTROLLED}" = "no" ] || [ "${NM_CONTROLLED}" = "n" ] || [ "${NM_CONTROLLED}" = "false" ]; then
            if [ "${BOOTPROTO}" = "bootp" ] || [ "${BOOTPROTO}" = "dhcp" ] || [ -z "${BOOTPROTO}" ]; then
                # device is not NetworkManager controlled and uses dhcp,
                # now see if it's actually up at the moment
                /sbin/ip link show ${DEVICE} | /bin/grep -qE "state (UP|UNKNOWN)" >/dev/null 2>&1
                if [ $? -eq 0 ]; then
                    echo "${DEVICE}" >> ${PM_DHCLIENT_SUSPEND}
                    /sbin/ifdown ${DEVICE}
                fi
            fi
        fi
    done
}

resume_dhclient() {
    [ ! -f ${PM_DHCLIENT_SUSPEND} ] && return
    [ ! -x /sbin/ifup ] && return

    cd /etc/sysconfig/network-scripts
    while read device ; do
        /sbin/ifup ${device}
    done < ${PM_DHCLIENT_SUSPEND}

    /bin/rm -f ${PM_DHCLIENT_SUSPEND}
}

case "$1" in
    hibernate|suspend)
        suspend_dhclient
        ;;
    thaw|resume)
        resume_dhclient
        ;;
    *) exit $NA
        ;;
esac

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