On Wed, Oct 23, 2013 at 06:55:02AM -0700, James Chargin wrote:
I have, more recently, been using scripting of the form
if test "X" != "X${var}"; then echo defined else echo undefined fi
Thanks for the feedback.
I was attempting to do something like that originally but was hitting problems related to the expansion which I'm still tracking down:
WRONG: $ set var $ test "x${var}" = "x" && echo undefined undefined $ set var 1 $ test "x${var}" = "x" && echo undefined $ set var "1; 2; 3" $ test "x${var}" = "x" && echo undefined
undefined
It DOES seem to work a lot better with != as you mentioned above though...
RIGHT: $ set var $ test "x${var}" != "x" && echo defined $ set var 1 $ test "x${var}" != "x" && echo defined defined $ set var "1; 2; 3" $ test "x${var}" != "x" && echo defined defined
- Andy