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Sunday, August 27, 2000, 8:27:23 AM, Peter wrote:
> I've got a directory that has permissions of drwxrwxrwt
> What exactly is the status described by the 't'?
The "t" bit was originally just for executable files, and was called
the "sticky bit". It told the kernel to keep an executable's text in
memory (or on swap) so that it would start up more quickly on
subsequent invocations. Its meaning changed somewhat with the advent
of memory paging, but I don't recall the details.
When applied to a directory (in more modern UNIX versions /
derivatives), it generally means that even though the directory may
have general write access, only the owner of any given file (or root)
may delete that file. This prevents several nasty attacks by one user
of a multi-user UNIX against another. Deleting someone else's temp
files during a compile or edit session could be nasty.
Ron.
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