From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andreas Engel <Andreas.Engel@marconi.com>
Date: Mon, 22 Aug 2005 12:57:58 +0200
Subject: [U-Boot-Users] test variable existence in hush
Message-ID: <20050822125758.00001da8@idefix>
List-Id: <u-boot.lists.denx.de>
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To: u-boot@lists.denx.de

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