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Re: [Help-bash] Why empty key is not allowed?
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From: |
Peng Yu |
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Subject: |
Re: [Help-bash] Why empty key is not allowed? |
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Date: |
Sat, 21 Sep 2019 19:31:17 -0500 |
Another problem is that when the key is empty, the value can not be
empty. I don't understand the rationale of having this as an error. It
is more intuitive to allow empty value no matter what the keys are.
$ declare -A x
$ x[""]=
-bash: x[""]: bad array subscript
$ x[a]=
On 9/21/19, Chris F.A. Johnson <address@hidden> wrote:
> On Sat, 21 Sep 2019, Peng Yu wrote:
>
>> Hi,
>>
>> I am trying to assign an empty key to an associated array.
>>
>> $ declare -A x
>> $ x[]=1
>> -bash: x[]: bad array subscript
>>
>> But I got this error. Is it not allowed? Or I am not doing it correctly?
>>
>> The manpage says this. So empty string should be allowed?
>>
>> "associative arrays are referenced using arbitrary strings."
>
> And empty string IS allowed. You are not using any string; that is not
> allowed.
>
> x[""]=1
>
>
> --
> Chris F.A. Johnson <http://cfajohnson.com/>
> =========================== Author: ===============================
> Shell Scripting Recipes: A Problem-Solution Approach (2005, Apress)
> Pro Bash Programming: Scripting the GNU/Linux shell (2009, Apress)
>
--
Regards,
Peng