Code:

 while read line
do
read test?"Enter a Value:"
done < testfile

In the above code, in the first line, it says read line.. it reads the first line from the testfile and puts it into the variable called line, again when you say read test, it actually reads the second line from testfile and puts it into the variable test.. it won't take the input from the keyboard because you have given the input as testfile by specifying the "<".

use this code

#!/usr/bin/ksh

IFS="
"

for line in $(< testfile)
do
echo $line
echo "Enter value :"
read a
done