How to specify the arguments' order with getopts function?

Question

test-fun(){    
    OPTIND=1
    while  getopts  "waz" arg
    do
        case  $arg  in
            w)
                 echo  "ok w"
                ;;
            a)
                echo  "ok a"
                ;;
            z)
                echo  "ok z"
                ;;   
        esac
    done
}

For the above test-fun, test-fun -wz result in

ok w
ok z

test-fun -zw result in

ok z
ok w

I want to specify the arguments' order for test-fun function,all arguments in the order w a z,if you input test-fun zw,an error occur wrong arguments' order for the function,how to fix it?

The arguments' order contain some useful info for my real function. — , Jul 05 '17 at 13:58
That makes me wonder how optional they actually are, and whether you should just be using positional parameters instead. — chepner, Jul 05 '17 at 14:10
Or rather, what does `zw` tell you that is different from `wz` if `wz` isn't allowed in the first place? — chepner, Jul 05 '17 at 14:10

score 0 · Answer 1 · answered Jul 05 '17 at 14:35

Put the arguments in a variable with line feeds (vars), sort it and then process the new variable (vars1).

test-fun(){    
OPTIND=1
while  getopts  "waz" arg
do
    vars=$vars"\n"$arg
done
vars1=$(printf $vars | sort)
for i in $vars1

do
    case  $arg  in
        w)
             echo  "ok w"
            ;;
        a)
            echo  "ok a"
            ;;
        z)
            echo  "ok z"
            ;;   
    esac
done
}

How to specify the arguments' order with getopts function?

1 Answers1