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/share/doc/util-linux/getopt-parse.bash
#!/bin/bash

# A small example script for using the getopt(1) program.
# This script will only work with bash(1).
# A similar script using the tcsh(1) language can be found
# as getopt-parse.tcsh.

# Example input and output (from the bash prompt):
#
# ./getopt-parse.bash -a par1 'another arg' --c-long 'wow!*\?' -cmore -b " very long "
# Option a
# Option c, no argument
# Option c, argument 'more'
# Option b, argument ' very long '
# Remaining arguments:
# --> 'par1'
# --> 'another arg'
# --> 'wow!*\?'

# Note that we use "$@" to let each command-line parameter expand to a
# separate word. The quotes around "$@" are essential!
# We need TEMP as the 'eval set --' would nuke the return value of getopt.
TEMP=$(getopt -o 'ab:c::' --long 'a-long,b-long:,c-long::' -n 'example.bash' -- "$@")

if [ $? -ne 0 ]; then
	echo 'Terminating...' >&2
	exit 1
fi

# Note the quotes around "$TEMP": they are essential!
eval set -- "$TEMP"
unset TEMP

while true; do
	case "$1" in
		'-a'|'--a-long')
			echo 'Option a'
			shift
			continue
		;;
		'-b'|'--b-long')
			echo "Option b, argument '$2'"
			shift 2
			continue
		;;
		'-c'|'--c-long')
			# c has an optional argument. As we are in quoted mode,
			# an empty parameter will be generated if its optional
			# argument is not found.
			case "$2" in
				'')
					echo 'Option c, no argument'
				;;
				*)
					echo "Option c, argument '$2'"
				;;
			esac
			shift 2
			continue
		;;
		'--')
			shift
			break
		;;
		*)
			echo 'Internal error!' >&2
			exit 1
		;;
	esac
done

echo 'Remaining arguments:'
for arg; do
	echo "--> '$arg'"
done

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