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Date: Sat, 24 Jul 2004 13:31:10 +0200
From: Sebastian Steenbuck <me@x3k6a2.net>
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Subject: Re: permissions
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> How can I make a directory permission so that 
> the user can write but cannot delete a file inside the directory?

Another way is to set the setuid bit. (chmod 4000)

See chmod (1)

>          4000    (the setuid bit).  Executable files with this bit set will
>                  run with effective uid set to the uid of the file owner.
>                  Directories with this bit set will force all files and sub-
>                  directories created in them to be owned by the directory
>                  owner and not by the uid of the creating process, if the
>                  underlying file system supports this feature


mfg

Sebastian Steenbuck