On Thu, 3 Feb 2022, Po Lu wrote:

> Eli Zaretskii <eliz@gnu.org> writes:
>
>> Can you tell more about the incompatibilities, perhaps by comparing
>> the output of their 'ls' with a compatible one?
>
> I can't remember the specifics, but IIRC their version of ls simply
> prints out each file in the current working directory, without any
> option to display permission bits, size, or ownership information.
>

The manpage for plan9's ls command is attached.

-- 
vl