From mboxrd@z Thu Jan  1 00:00:00 1970
Subject: Re: [9fans] book chapters
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From: Kenji Arisawa <arisawa@ar.aichi-u.ac.jp>
To: 9fans@cse.psu.edu
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Date: Tue,  1 Jul 2003 20:27:32 +0900
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Hello,

 >You already have that.  Make the directory only writable by the
 >students.  They can create files in it but can't remove them.

Thanks.
I have examined and found that is exactly what I wanted.
It seems the meaning of x bit for directory has been changed.
Man page "chmod" is old.

Kenji Arisawa