bash month_length

#!/bin/bash

month_length()
{
monthD="31 28 31 30 31 30 31 31 30 31 30 31"
echo "$monthD"|awk '{print $"'${1}'"}'
}

echo "INPUT MONTH:"
read month
echo
days_in=$(month_length $month)
echo "The $month month days is: $days_in"
exit 0