Bash 脚本长参数（getopts）

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#!/bin/bash

function main() {

    local OPTIND

    count=0

    while getopts ab:-: OPT
    do
        echo "current -${OPT}${OPTARG}"

        case "${OPT}" in 
            -)
                case "${OPTARG%%=*}" in
                    atest)
                        echo "option: --${OPTARG}"
                        echo ""
                        let count++
                        ;; 
                    btest)
                        echo "option: --${OPTARG%%=*}"
                        echo "value: ${OPTARG#*=}"
                        echo ""
                        let count=count+2
                        ;;
                esac
                ;; 
            a)
                echo "option: ${OPTIND}"
                echo ""
                let count++
                ;; 
            b)
                echo "option: ${OPTIND}"
                echo "value: ${OPTARG}"
                echo ""
                let count=count+2
                ;; 
        esac
    done

    shift $count

    echo "rest option(s): $@"
}

main "$@"

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current --atest
option: --atest

current --btest=2 4
option: --btest
value: 2 4

rest option(s): --ctest=3 --dtest=4