[U-Boot-Users] test variable existence in hush

Hi,

can anyone confirm that this is a bug in the hush shell: both

test -n "$foo" && echo yes

and

test -z "$foo" && echo yes

result in nothing echoed if foo is not defined. If, on the other hand, foo is defined to a string containing blanks, both commands will echo yes.

Is there another way to check the existence of a variable?

Regards, Andreas Engel