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writeable but not eraseable directory



hi

I have a dirctory ~user1 ( which is owned by user 1)
I have a subdir ~user1/changes
I want the user to be able to write to ~user1/ and to ~user1/changes/
but i do not want him to be able to rmdir ~user1/changes

is there a way ?
( i am aware of a way of making a unwritable middle directory i.e.
~user/unwritable-dir/changes , but i'm not looking for that solution ...
)

another question: is there a /dev/null directory ( i.e. you can write
anything you want into it, but what you write isn't really written, you
just dont get an error ... )


thanks
erez.


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