Shell Programming and Scripting

printf "$FBOLD\nPlease enter the minutes (0-59): $FREG"
        read MIN

        case "$MIN" in
        [0-9]|[0-5][0-9]) break 2;;
          *) 
        echo ""
     echo "Invalid minutes, please try again.";;
        esac

printf "$FBOLD\nPlease enter the minutes (0-59): $FREG"
read MIN

case "$MIN" in
[0-9]|[0-5][0-9]) echo "valid min $MIN"; break 2;;
*)
echo ""
echo "Invalid minutes, please try again.";;
esac

printf "$FBOLD\nPlease enter the month (0-12): $FREG"
read MON

case "$MON" in
0[1-9]|[0-9]|1[012]) echo "valid month $MON";break 2;;
*)
echo ""
echo "Invalid month, please try again.";;
esac

printf "$FBOLD\nPlease enter the day (0-31): $FREG"
read DAY

case "$DAY" in
0[1-9]|[0-9]|[12][0-9]|3[01]) echo "valid Day $DAY";break 2;;
*)
echo ""
echo "Invalid day, please try again.";;
esac

printf "$FBOLD\nPlease enter the hr (0-23): $FREG"
read HR

case "$HR" in
0[1-9]|[0-9]|1[0-9]|2[0123]) echo "valid hour $HR";break 2;;
*)
echo ""
echo "Invalid hour, please try again.";;
esac

y=`date '+%Y'`
day_of_week=`date -d $MON/$DAY/$y '+%u'`

echo "Cronjob scheduled on $MON $DAY $day_of_week $HR $MIN"

echo -n Please enter MONTH DAY HOUR MINUTE :
read MONTH DAY HOUR MINUTE
date -d"$(date -d+%Y)${MONTH}${DAY} ${HOUR}:${MINUTE}" > /dev/null && echo "Cronjob scheduled on $MONTH $DAY $HOUR $MINUTE"

case "$MON" in
0[1-9]|[1-9]|1[012]) echo "valid month $MON";break 2;;
*)
echo ""
echo "Invalid month, please try again.";;
esac

printf "$FBOLD\nPlease enter the day (1-31): $FREG"
read DAY

case "$DAY" in
0[1-9]|[1-9]|[12][0-9]|3[01]) echo "valid Day $DAY";break 2;;
*)
echo ""
echo "Invalid day, please try again.";;
esac