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

[Andreas Engel]

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