Re: Negation in a condition triggers error message

[Pascal Hambourg]

On 16/06/2023 at 02:21, Adam Vodopjan wrote:
> I'm on grub 2.06 in ubuntu 22.04
>
> grub> [ a -gt 9 ]; echo $?
>
> 1
> grub> [ ! a -gt 9 ]; echo $?
> error: unrecognized number.
> 0
>
> grub> [ a -lt 9 ]; echo $?
> error: unrecognized number.
> 0
> grub> [ ! a -lt 9 ]; echo $?
> 1
>
> grub> [ a -eq 9 ]; echo $?
> 1
> grub> [ ! a -eq 9 ]; echo $?
> error: unrecognized number.
> 0
>
> Why does it show/hide the error depending on the negation? Evidently, the error
> should be shown each time, one of the args is not a number in each example.

It looks like the error is shown only when the whole condition is true, 
assuming that the non-number argument is evaluated as 0.