On 15 May 2017 at 17:44, trebol <trebol55555@yandex.ru> wrote:

> I suppose this is the perfect answer to my silly question: why not permit =
> after the start of a command?
>

do that, but make it behave like = before the start of the command.
rc provides the outer syntax for all commands, as it does for file matching
and redirection.
the commands receive argv[], and (in Plan 9) /env as before.
rc puts positional word arguments in argv, which are identified by
position, and assignments in /env, which is what it currently does for x=y
before a command (or before no command).