getopts is not parsing my command line options

Question

I'm running bash version 4.2, and I'm trying to parse command line parameters with builtin command getopts,

But getopts doesn't seem to parse it correctly, if -s wasn't the first parameter, it won't be parsed

-s not parsed:

%> ./getopt.sh aaa -s aaa
aaa

This one get's parsed

%> ./getopt.sh -s aaa
s: aaa
aaa

The script is here:

#!/bin/bash

while getopts "bs:" opt
do
    case $opt in
        s)
            echo "s: $OPTARG"
            ;;
        *)
            echo not supported
            ;;
    esac
    shift
done

echo $1

Answer 1

Unlike the (older) getopt, getopts does not rearrange the arguments to put the options first. Therefore, in

./getopt.sh arg1 -s opt1

option-parsing stops as soon as the non-option arg1 is seen.