# Scenario 1
function f { dialog --menu "asdf" 10 10 3 1 a 2 b; }
f # This makes a dialog. Great.

# Scenario 2
function f { read x; dialog --menu "asdf" 10 10 3 1 a 2 b; }
echo "stuff" | f # This makes a dialog, but I can't move the selection cursor around at all