셸 스 크 립 트 에서 전달 하 는 매개 변수 3 가지 방법의 비교

#!/bin/bash
#extracting command text_text_text_line options as parameters

help_info(){
    echo "NAME"
    echo "\t$0"
    echo "SYNOPSIS"
    echo "\t$0 is a shell test about process options"
    echo "DESCRIPTION"
    echo "\toption like -a -b param1 -c param2 -d"
}

if [ $# -lt 0 ]
then
    help_info
fi

nomal_opts_act()
{
    echo -e "
### nomal_opts_act ###
"

    while [ -n "$1" ]
    do
    case "$1" in 
        -a)
            echo "Found the -a option"
            ;;
        -b)
            echo "Found the -b option"
            echo "The parameter follow -b is $2" 
            shift
            ;;
        -c)
            echo "Found the -c option"
            echo "The parameter follow -c is $2"
            shift
            ;;
        -d)
            echo "Found the -d option"
            ;;
         *)
             echo "$1 is not an option"
            ;;
    esac
    shift
    done
}

# shell         ，           
#  ：    ，     ，     
#  ：  

getopt_act()
{
    echo -e "
### getopt_act ###
"

    GETOPTOUT=`getopt ab:c:d "$@"`
    set -- $GETOPTOUT 
    while [ -n "$1" ] 
    do
    case $1 in 
        -a)
            echo "Found the -a option"
            ;;
        -b)
            echo "Found the -b option"
            echo "The parameter follow -b is "$2""
            shift
            ;;
        -c)
            echo "Found the -c option"
            echo "The parameter follow -c is "$2""
            shift
            ;;
        -d)
            echo "Found the -d option"
            ;;
        --)
            shift
            break
            ;;
         *)
             echo "Unknow option: "$1""
            ;;
    esac
    shift
    done

    param_index=1
    for param in "$@"
    do
        echo "Parameter $param_index:$param"
        param_index=$[ $param_index + 1 ] 
    done
}

# getopt         
#  ：   getopts         ，         ，  --           
#  ：   getopts   
#1.   set --     ，    ，    shift
#2.            -a -b dog -c "earth moon" -d -f param1 param2       

getopts_act()
{
    echo -e "
### getopts_act ###
"
    while getopts :ab:c:d ARGS
    do
    case $ARGS in 
        a)
            echo "Found the -a option"
            ;;
        b)
            echo "Found the -b option"
            echo "The parameter follow -b is $OPTARG"
            ;;
        c)
            echo "Found the -c option"
            echo "The parameter follow -c is $OPTARG"
            ;;
        d)
            echo "Found the -d option"
            ;;
         *)
             echo "Unknow option: $ARGS"
            ;;
    esac
    done

    shift $[ $OPTIND -1 ] 
    param_index=1
    for param in "$@"
    do
        echo "Parameter $param_index:$param"
        param_index=$[ $param_index + 1 ] 
    done
}

#getopts          
#  ：          ：-c "earth moon"
#                             ：-bdog
#                       ?  
#            Unknow option: ?

nomal_opts_act -a -b dog -c earth -d -f param1 param2
getopts_act -a -b dog -c "earth moon" -d -f param1 param2
getopt_act -a -b dog -c earth -d -f param1 param2