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/sbin/xfs_info
#!/bin/sh -f
# SPDX-License-Identifier: GPL-2.0
#
# Copyright (c) 2000-2001 Silicon Graphics, Inc.  All Rights Reserved.
#

OPTS=""
USAGE="Usage: xfs_info [-V] [-t mtab] [mountpoint|device|file]"

# Try to find a loop device associated with a file.  We only want to return
# one loopdev (multiple loop devices can attach to a single file) so we grab
# the last line and return it if it's actually a block device.
try_find_loop_dev_for_file() {
	local x="$(losetup -O NAME -j "$1" 2> /dev/null | tail -n 1)"
	test -b "$x" && echo "$x"
}

while getopts "t:V" c
do
	case $c in
	t)	OPTS="-t $OPTARG" ;;
	V)	xfs_spaceman -p xfs_info -V
		status=$?
		exit $status
		;;
	*)	echo $USAGE 1>&2
		exit 2
		;;
	esac
done
set -- extra "$@"
shift $OPTIND
case $# in
	1)
		arg="$1"

		# See if we can map the arg to a loop device
		loopdev="$(try_find_loop_dev_for_file "${arg}")"
		test -n "${loopdev}" && arg="${loopdev}"

		# If we find a mountpoint for the device, do a live query;
		# otherwise try reading the fs with xfs_db.
		if mountpt="$(findmnt -f -n -o TARGET "${arg}" 2> /dev/null)"; then
			xfs_spaceman -p xfs_info -c "info" $OPTS "${mountpt}"
			status=$?
		else
			xfs_db -p xfs_info -c "info" $OPTS "${arg}"
			status=$?
		fi
		;;
	*)	echo $USAGE 1>&2
		exit 2
		;;
esac
exit $status

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