Re: bash test ?

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On 19/04/2023 08:04, wwp wrote:
Hello lejeczek,

On Wed, 19 Apr 2023 07:50:29 +0200 lejeczek via CentOS <centos@xxxxxxxxxx> wrote:

Hi guys.

I cannot wrap my hear around this:

-> $ unset _Val; test -z ${_Val}; echo $?
-> $ unset _Val; test -n ${_Val}; echo $?
-> $ _Val=some; test -n ${_Val}; echo $?

What is this!?
How should two different, opposite tests give the same result
Is there some bash option which affects that and if so, then what would be the purpose of such nonsense?
Surround ${_Val} with double quotes (as you should) and things will be different:

$ unset _Val; test -n "${_Val}"; echo $?

Now you get it? :-)

I don't know, am not sure, I remembered it differently, did not think enclosing quotes were necessary(always?) for that were {}
thanks, L.
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