shell getopts 用法

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#!/bin/bash   func() {     echo "Usage:"     echo "test.sh [-j S_DIR] [-m D_DIR]"     echo "Description:"     echo "S_DIR,the path of source."     echo "D_DIR,the path of destination."     exit -1 }   upload="false"   while getopts 'h:j:m:u' OPT; do     case $OPT in         j) S_DIR="$OPTARG";;         m) D_DIR="$OPTARG";;         u) upload="true";;         h) func;;         ?) func;;     esac done   echo $S_DIR echo $D_DIR echo $upload