Re: whats wrong with (( a = 8 , a > 4 && a -= 2 || a-- )) , bash: ((: a = 8 , a > 4 && a -= 2 || a-- : attempted assignment to non-variable (error token is "-= 2 || a-- ")

[Kerin Millar]

On Thu, 23 Mar 2023 21:36:38 +0530
Bipul kumar <bipul.opensource@gmail.com> wrote:

> Let me explain here
> The -= operator performs a compound subtraction and assignment operation,
> which modifies the value of the variable on the left-hand side of the
> operator.
> Also it looks  within a logical expression like this a -= 2 , Bash does not
> allow any left side effects to occur.
> So in order to make it work as it insists bash to perform in an isolated
> subshell  only a - = 2  NO ANY OTHER LOGICAL EXPRESSION  Because it's a

There are no subshells involved at any juncture. Perhaps you are confusing the 
use of parentheses inside an arithmetic expression with the (list) compound 
command?

-- 
Kerin Millar