validate case statement

Shell Programming and Scripting
1

Hello,

I need to take the input from user on below format and validate it.

ddd:hr:mm where ddd=mon-sun(days) , hr:hour (0-23) , mm=min(0-59).
Please assist me for getting input from user.

Thanks
Qamar

2 
OLDIFS="$IFS"
IFS=":"
while true
do
        printf "Enter time: "
        read DDD HH MM

        case "$DDD" in
                sun|mon|tue|wed|thu|fri|sat|sun)  ;;
                *) continue ;;
        esac

        case "$MM" in
                [0-5][0-9]) ;;
                *) continue;;
        esac

        case "$HH" in
                [0-1][0-9]) ;;
                2[0-3]) ;;
                *) continue;;
        esac

        break
done

IFS="$OLDIFS"
3

Nice solution corona688.

@qamar.alam, you can also print error/help messages before calling continue eg:

    *) echo "Hour must be between 0 and 23 - please reenter" ; continue ;;
4

Thank you so much corona688... It's really good and straight forward solution.