getopts.bash

#!/bin/bash

while (( $# > 0 )); do
    case "$1" in
        -*)
            if [[ $1 == -- ]]; then
                IGNORE_REST=true
                shift
                continue
            elif [[ -n $IGNORE_REST ]]; then
                (( argc++ ))
                argv=( "${argv[@]}" "$1" )
                shift
                continue
            fi

            OPTIND=${argc:1}
            while getopts 'abcdefghijklmnopqrstuvwxyz' flag; do
                case "$flag" in
                    h)
                        echo "Usage: $0 [-h] [-r]"
                        ;;
                    *)
                        echo "$flag found"
                        ;;
                esac

            done
            shift $(( OPTIND - 1 ))
            ;;
        *)
            (( argc++ ))
            argv=( "${argv[@]}" "$1" )
            shift
            ;;
    esac
done

for a in ${argv[@]}; do
    echo "> $a"
done