hiiii djt0506,

got a easy solution for you ...

you neeed to write a function "function Func_validate_phone_number" which will validate the phone number entered by the user.
if the ph no is blank it will again call the same function and will ask the user to enter it again....until he enters any thing other than "enter".

if you want to validate it further (for valid numbers or no characters etc) then you need to do some more validations....which again quiet easy .

here is my code....

function Func_validate_phone_number {

if [ -z "$ph" ]
then
echo "Phone Number cannot be blank....please re-enter."
read ph
Func_validate_phone_number "$ph"
else
echo "Thanks for giving your phone number.....bye"
fi

}


echo "Enter the phone number"
read ph
Func_validate_phone_number "$ph"


i have tested it .....it works fine ...

cya