liam

unset varYES='[Yy]?([Ee][Ss])'NO='[Nn]?([Oo])'while [[ "$var" != $YES && "$var" != $NO ]]do        printf "Enter value: "        read var        case $var in        $YES)                echo "Yes"        ;;        $NO)                echo "No"        ;;        esacdone