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Re: building arrays from non array variables using 'array[${#array[@]}]=
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From: |
Chet Ramey |
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Subject: |
Re: building arrays from non array variables using 'array[${#array[@]}]=' |
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Date: |
Sun, 24 Jan 2010 15:19:55 -0500 |
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User-agent: |
Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.1.7) Gecko/20100111 Lightning/1.0b1 Thunderbird/3.0.1 |
On 1/24/10 5:13 AM, Mart Frauenlob wrote:
> Hello,
>
> I'd like to ask, if the behavior of indexed array assignment using the
> form: 'array[${#array[@]}]=' is as expected.
Thanks for the report. The question is what ${#array[@]} should return
when it refers to a scalar variable that has not been assigned a value.
Previous versions of bash returned 1, not checking whether or not the
variable is set; the right answer is 0 if the variable is not set and 1
otherwise.
Any official change will probably wait until bash-4.2. I have attached a
patch to evaluate, though.
Chet
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU chet@case.edu http://cnswww.cns.cwru.edu/~chet/
unset-var-length
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