Re: [PATCH] doc: The test "==" operator is a GNU extension.

[Pádraig Brady]

On 12/11/2020 17:17, Ben Pfaff wrote:
> * doc/coreutils.texi (test invocation): Mark the "==" operator as a GNU
> extension, to reduce the number of people who accidentally use it while
> thinking it's portable.
> ---
>   doc/coreutils.texi | 1 +
>   1 file changed, 1 insertion(+)
>
> diff --git a/doc/coreutils.texi b/doc/coreutils.texi
> index 8d9320ca2..601b06300 100644
> --- a/doc/coreutils.texi
> +++ b/doc/coreutils.texi
> @@ -13336,6 +13336,7 @@ True if the strings are equal.
>   @opindex ==
>   @cindex equal string check
>   True if the strings are equal (synonym for =).
> +This form is a GNU extension.
>   
>   @item @var{string1} != @var{string2}
>   @opindex !=

Well it's not GNU specific.
Also I think it's proposed in POSIX, Eric?
I agree that we should mention its lack of portability though.

cheers,
Pádraig