Sure.. or, make some comments about it being highly non-portable.

It isn't even really a BSD'ism.  The idea is a flop.  I wonder if
it was an attempt to pull a VMS idea.

> I'd like to make that plainer.  It isn't the first time people
> waste time reading sysexits(3) and arguing about it.
> 
> OK?
>   Ingo
> 
> 
> Index: sysexits.3
> ===================================================================
> RCS file: /cvs/src/share/man/man3/sysexits.3,v
> retrieving revision 1.12
> diff -u -r1.12 sysexits.3
> --- sysexits.3        30 Dec 2015 16:41:52 -0000      1.12
> +++ sysexits.3        11 Apr 2017 14:06:19 -0000
> @@ -40,7 +40,7 @@
>  Some programs use defined error codes to distinguish between possible errors.
>  However, most programs in
>  .Ox
> -do not.
> +do not, and using these codes in additional programs is not recommended.
>  .Pp
>  The successful exit is always indicated by a status of 0, or
>  .Dv EX_OK .

1

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