Re: bash optimization away question

[Chet Ramey]

On 11/2/24 8:29 PM, #!microsuxx wrote:
> is a
>
> var=${var:-blabla}
>
> optimized away to no exec at all
> if var is not empty
> ?

No. The expansion has to take place, to account for side effects, and the
attempted assignment has to take place, since that can have side effects
and transform the value to be assigned as well. It doesn't make sense to
try and preserve the information about which variable was expanded for
this corner case.


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

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