Shell Programming and Scripting

echo begin
while getopts 1:2:3:4: mode
do
case $mode in
 1)echo "You have chosen mode1"
        case $OPTARG in
        a) echo "User Specified Date Range"
        rangelist.sh ;;
        b) echo "user specified month and year";;
        ?) echo "Default, Current Month";;
        esac
        ;;
 2)echo " You have chosen mode2"
        case $OPTARG in
        m) echo "File Specified Manually";;
        ?) echo "Log error if files are missing";;
        esac
        ;;
 3)echo "number of working Days"
        case $OPTARG in
        x)echo "Runs for all days of month";;
        ?) echo "Runs for working days only";;
        esac
        ;;
 4)echo " Selection mode"
        case $OPTARG in
        p)echo "takes specific ";;
        ?) echo "Generates report ";;
        esac
        ;;
 ?)echo "DEFAULT mode is selected";;
esac
done
echo end

echo $"please input date range in the given format yyyymmdd to yyyymmdd"
read $1
if [[ $1 == null ]]
then
echo $"you havent specified ur date range"

#but you have to change your mode parameter
and you can use date command in comparison with awk command to cut desired values as you want."