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more bash questions


I am tring to get a statement where I request input from the user, and
when a carriage return is entered with no data the script moves to the
next step. So far I have:

while read USER; do
        if [ -n $USER ]; then
                echo $USER >> /tmp/allow.users
                echo "Thank you." 

But its not ending when I enter a blank line. I think its because the
minute the user enters the first bit a requested data, then $USER is not
null, so the loop will never end. 
I am fairly certain what I want to do is pretty easy, but my first stab is
not quite there. Can someone point out where to take this?


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