bug-bash
[Top][All Lists]
Advanced

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: test -v for array does not work as documented


From: Chet Ramey
Subject: Re: test -v for array does not work as documented
Date: Sun, 23 Feb 2020 11:27:21 -0500
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:68.0) Gecko/20100101 Thunderbird/68.4.1

On 2/21/20 3:31 AM, pepa65 wrote:
> On 21/02/2020 02.37, Chet Ramey wrote:
>> It's unset because it doesn't have a value, but it retains the `local'
>> attribute so it stays local if subsequently assigned one.
> 
> Is there any reason the local attribute cannot be unset? If it would be
> possible then the "declare/typeset -p" would return 1 when the variable
> doesn't exist.

There have been several umm...passionate discussions about this. The idea
is that a local variable that's unset should stay local (and unset) until
the function returns instead of `uncovering' a variable at a previous
scope.

Think about dynamic scoping and its effects on variable visibility.

> By the way, it seems that `local -p var` doesn't work like 'declare -p
> var` even though `help local` suggests it should.

How so? Do you mean that declare -p var in a function will show different
variables?

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    address@hidden    http://tiswww.cwru.edu/~chet/



reply via email to

[Prev in Thread] Current Thread [Next in Thread]