mvdir, is or is not a bug?

[allbery at ncoast.UUCP]

As quoted from <402 at yabbie.rmit.oz> by rcodi at yabbie.rmit.oz (Ian Donaldson):
+---------------
| If there is a better explanation of why mvdir was separated out from mv,
| I and probably many others are all ears.
+---------------

I was under the impression that it was done for the same reason that rmdir
isn't part of rm.  Under System III, mv could only move a directory from
one name to another if it stayed within the same parent directory.  System
V mv is more general; unfortunately, it now has to deal with `.' and `..'.
Written correctly, mv/mvdir could be used like rm/rmdir by ordinary users.
It is my hope that the separation of the two is a first step in doing this,
the next step being the trapping of illegal situations like that done by
rmdir and rm -r.

++Brandon
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