michael at araneidae.co.uk
Tue Feb 17 07:56:43 GMT 2004
> > To be precise, on a directory the "r" bit allows you to access a file
> > *if* you know its name, while the "x" bit allows you to list the files
> > in the directory.
> I'm too tired to figure out Frank's problem, but you've got this
> backwards. "r" allows reading of the directory, "x" allows access to
> files within it.
You're quite right. I was confused by the chmod man page which says that
the x bit "allows ... search in the directory"; it really means direct
So we have:
r-x Full access
--x Can access known files, can't list
--- Access forbidden
r-- Completely bloody useless!
My experience with r-- or rw- is that it is worthless: listing the
directory returns nothing (permission not denied, just no files listed)
and writing to the directory is also disabled.
> ben at yellow:/tmp$ chmod 400 x
> ben at yellow:/tmp$ ls -l x
> ls: x/y: Permission denied
> total 0
Now that is odd. My experience is quite different:
$ cd /tmp; mkdir x; touch x/y
$ chmod 400 x
$ ls -al x
Listing the directory returns nothing at all. I've tested this on FreeBSD
4.9 and 4.5 with the same result; interestingly, on Linux and sun3
machines I get your result, ls: x/y: Permission denied.
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