シェルスクリプトで2本の水平バーを使って外部パラメータを受け取る方法

[developer@hadoop-cluster-manager shell]$ . /demo.sh --help
The sqoop program starts running: demo.sh
Usage: . /demo.sh [options]
 
Options:
 --append, -a: append to import (default is append mode)
 --overwrite, -o: overwrite import 
 
 --method, -m: single-single-day import
          interval-Interval import
          all-all-table import
 
 --date, -d: single-day import, with a date (in yyyymmdd format)
 
 --startdate, -s: interval-import, start date
 --enddate, -e: interval import, end date
 
 --help, -h help

# Define command execution options
if ! ARGS=$(getopt -o aom:d:s:e:h --long append,overwrite,method:,date:,startdate:,enddate:,help -n "$0" -- "$@"); then
  echo "Terminating... "
  echo -e "Usage: . /$SCRIPT_NAME [options]\n"
  echo -e "Options:\n --append, -a: append import (default is append mode) \n --overwrite, -o: overwrite import \n\n --method, -m: single-single-day import \n interval-import \n all-all-table import \n\n --date , -d: single-day import, data on a certain date (in the format yyyymmdd) \n\n --startdate, -s: interval import, start date \n\n --enddate, -e: interval import, end date \n\n --help, -h help"
  exit 1
fi
 
# Assign normalized command-line arguments to location parameters ($1,$2,...)
# The -- ensures that whatever options passed in as part of the script won't get interpreted as options for set, but as options for the command denoted by the $ progname variable.
eval set -- "${ARGS}"
 
# Accept execution options; assign to variables
while true; do
 case "$1" in
  -a|--append)
   mode='append'
   shift
   ;;
  -o|--overwrite)
   mode='overwrite'
   shift
   ;;
  -m|--method)
   method=$2
   shift 2
   ;;
  -d|--date)
   date=$2
   shift 2
   ;;
  -s|--startdate)
   startdate=$2
   shift 2
   ;;
  -e|--enddate)
   enddate=$2
   shift 2
   ;;
  --)
   shift
   break
   ;;
  -h|--help)
   echo -e "Usage: . /$SCRIPT_NAME [options]\n"
   echo -e "Options:\n --append, -a: append import (default is append mode) \n --overwrite, -o: overwrite import \n\n --method, -m: single-single-day import \n interval-import \n all-all-table import \n\n --date , -d: single-day import, data on a certain date (format yyyymmdd) \n\n --startdate, -s: interval import, start date \n\n --enddate, -e: interval import, end date \n\n --help, -h help"
   exit 0
   ;;
  ?)
   echo "Missing options, pls check!"
   exit 1
   ;;
 esac
done