20 Ocak 2021 Çarşamba tarihinde Léa Gris <lea.g...@noiraude.net> yazdı:
> Le 20/01/2021 à 12:16, Oğuz écrivait :
>
>> $ declare -l a
>> $ echo "${a:=X} $a"
>> X x
>>
>> This doesn't jive with what the manual says.
>>
>> `-l`:
>>
>>> When the variable is assigned a value, all upper-case characters are
>>>
>> converted to lower-case.
>>
>> `:=`:
>>
>>> If parameter is unset or null, the expansion of word is assigned to
>>>
>> parameter.
>>
>
> The assignation part:
> a is assigned X but it is stored as x in a.
>
> The value of parameter is then substituted.
>>
>
> The expansion part:
> The value X is expanded but is not affected by the lowercase
> transformation flag from a, so it remains as X.
>
The manual makes it explicit that it is `a''s value that is substituted,
not the value assigned to it, i.e X. I'd expect `${a:=X}' to expand to a
lowercase x there.
I filed a similar report here:
https://github.com/ksh93/ksh/issues/157
> The fact that an expansion also assign a value is a questionable design
> choice though.
>
> If I had to use this I would just silence the expansion as an argument to
> the dummy true or : command
>
> : ${a:=X}
>
> Is this a bug or am I missing something here?
>>
>
> Then likely not.
>
>
> --
> Léa Gris
>
>
>
--
Oğuz
