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Re: Local variables overriding global constants


From: Pierre Gaston
Subject: Re: Local variables overriding global constants
Date: Wed, 3 Apr 2013 11:33:20 +0300

On Wed, Apr 3, 2013 at 11:33 AM, Chris F.A. Johnson <address@hidden>wrote:

> On Wed, 3 Apr 2013, Pierre Gaston wrote:
>
>  On Wed, Apr 3, 2013 at 11:03 AM, Chris Down <address@hidden> wrote:
>>
>>  On 2013-04-03 11:00, Nikolai Kondrashov wrote:
>>>
>>>>  It doesn't work because you are trying to redefine an existing
>>>>>>> readonly variable.
>>>>>>>
>>>>>>
>>>>>> Yes, but I'm explicitly redefining it locally, only for this function.
>>>>>> And this works for variables previously defined in the calling
>>>>>>
>>>>> function.
>>>
>>>>
>>>>> You're not redefining it locally, you are unsuccessfully trying to
>>>>>
>>>> override a
>>>
>>>> global.
>>>>>
>>>>
>>>>
>>>  Still Nikolai has a point.
>> It's not clear why readonly variable can be overridden when the variable
>> is
>> declared readonly in the scope of an englobing function but not if it is
>> declared readonly in the global scope.
>>
>
>    If it's declared readonly in a function, the variable doesn't exist
>    outside of that function, so it's not readonly there.


I think you missed the point that "a" is called inside "b".
See the example below


>
>
>  $ bash -c 'a() {  v=2;echo "$v"; }; b () { declare -r v=1; a; echo "$v";
>> };
>> b'
>> bash: v: readonly variable
>>
>

if v doesn't exist in "a" why does it complain that it's readonly?


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