hi all

Shell Programming and Scripting
1

i need a help how do i validate that a given field is not blank ie it should not go to the next field when i press enter.

2

What do you mean by "field"? Something like this?

while true; do
  echo -n "Input your input: "
  read input
  case $input in "") echo "You lost. Play again";; *) break ;; esac
done

This will loop until the user enters non-blank input.