[TUHS] moving directories in svr2

[Douglas McIlroy]

> what was the last Unix version
> that let users make arbitrary links, such that the file system was no
> longer a DAG? I recall in v6 days hearing that earlier Unix allowed
> this, and that cleanup (via icheck and friends) got to be near
> impossible.

>From v1 on (I'm not sure about PDP-7 Unix) only the superuser could do
that, so what you heard strikes me as urban legend. Perhaps some
installations abused root privilege to scramble the file system, but I
certainly didn't see that happen in Research systems.

Doug