Re: 4.2 error: processing command substitution within arithmetic operation

[Rui Santos]

 On 24-06-2011 21:01, Greg Wooledge wrote:
> On Fri, Jun 24, 2011 at 06:18:08PM +0100, Rui Santos wrote:
> > Try this script:
> > #!/bin/bash
> >
> > declare -ax array
> > array[$(( $( echo -n 1001 ) - 1001 ))]=1
> >
> > this will issue an error: line 6: 1001: command not found
> imadev:~$ unset array
> imadev:~$ array[$(( $( echo -n 1001 ) - 1001 ))]=1
> imadev:~$ unset array
> bash: 1001: command not found
>
> And similar... hmm, this is beyond weird.  I have no idea what's happening
> here.
>
> But if you want to work around the problem, I would suggest simplifying
> things.  For starters, you do not need $((...)) inside an array index
> because the [...] already introduce a math context.
Hi Greg. Thanks for your reply.
I was not aware of that. It will be remembered for future scripts. I do, 
however, have legacy concerns to take care of and thus, I will need it 
to work on this cases.

Thanks.
> So:
>
> imadev:~$ array[$(echo -n 1001) - 1001]=1
> imadev:~$ set | grep array=
> array=([0]="1")
> imadev:~$ unset array
>
> And that assumes you need to keep the command substitution for some
> unstated reason.  If you can get rid of that too, that would be even
> better.

--
Regards,
Rui Santos