source: trunk/essentials/app-shells/bash/tests/getopts5.sub

#!/local/bin/bash
#Time-stamp: <95/06/07 07:40:40 hrue@imf.unit.no>

getop () {

    local OPTIND
    local OPTERR=1

    echo getop: OPTERR=$OPTERR    
    while getopts ab arg "$@"; do
        case $arg in
            a)
                echo a here
                ;;
            b)
                echo b here
                ;;
            :|?|*)
                echo something else here
                ;;
        esac
    done
    echo getop: OPTIND=$OPTIND
}

OPTIND=
OPTERR=0

echo OPTERR=$OPTERR
while getopts ab arg; do
    case $arg in
        a)
            echo a here
            ;;
        b)
            echo b here
            ;;
        :|?|*)
            
            echo something else here
            ;;
    esac
done

echo OPTIND=$OPTIND

getop "$@" -d -e

echo OPTIND=$OPTIND
echo OPTERR=$OPTERR