How to ask a question to a user in ksh

Shell Programming and Scripting
1

Hello,
I am writing a script in ksh(for HP Unix)where a user must answer to a question . So I want to know kow to test if the user do not answer , so if he enter "REturn".

I don't know how to test "space characters" or "empty characters

Thanks for your help

2

You can do stuff like this...

print -n "Enter your name - "
read name
if [[ -z $name ]] ; then
       print I guess you don\\'t know your name
       name="bozo"
fi
3

From man ksh...

This is also true for a string that is "space characters" because they are internal field separators.

Example

REPLY=""
while [[ -z $REPLY ]]
do
   read REPLY?"Enter field: "
   if [[ -z $REPLY ]]
   then
      echo Error: field is mandatory
   fi
done