Re: octal permissions

[Alexander Larsson <alexl redhat com>]

On Mon, 2007-09-03 at 19:57 +0200, Michael Luthardt wrote:
> Hi,
> 
> maybe this question was asked a dozen of times before, but I can't find
> an answer. 
> I use nautilus in ubuntu 7.04. What mean the 6 digit octal_permissions
> for files and 7 digits for folders? I'm rather familiar with UNIX
> permissions, but I can't figure out nautilus' meaning.

>From "man chmod":

A numeric mode is from one to four octal digits (0-7), derived by adding
up the bits with values 4, 2, and 1.  Omitted digits are assumed to be
leading zeros, except that if the first digit is omitted, a directory’s
set user and group  ID  bits  are  not affected.  The first digit
selects the set user ID (4) and set group ID (2) and restricted
deletion or sticky (1) attributes.  The second digit selects permissions
for the user who owns the file:  read  (4),  write (2), and execute (1);
the third selects permissions for other users in the file’s group, with
the same values; and the fourth for other users not in the file’s group,
with the same values.