On 2/20/20 10:05 AM, Ulrich Mueller wrote:
>>>>>> On Thu, 20 Feb 2020, pepa65 wrote:
>
>> On 20/02/2020 19.48, Ulrich Mueller wrote:
>>> Still, I think it's sad that there isn't a command that can test for
>>> assigned vs void variable, without the need for parsing of declare -p
>>> output.
>
>> There is no need to parse, the return value of `declare -p var` or
>> `typeset -p var` will tell you what you want.
>
> Unfortunately, it doesn't:
>
> $ f() {
> > local var
> > var="foo"
> > declare -p var
> > echo $?
> > unset var
> > declare -p var
> > echo $?
> > }
> $ f
> declare -- var="foo"
> 0
> declare -- var
> 0
It's unset because it doesn't have a value, but it retains the `local'
attribute so it stays local if subsequently assigned one.
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU [email protected] http://tiswww.cwru.edu/~chet/
