From: yermej <yermej@...>
Date: 2007-11-26T07:40:02+09:00
Subject: Re: Has anyone used File.stat to check permissions

On Nov 25, 3:29 pm, Peter Loftus <lof...@gmail.com> wrote:
> In ruby API there is an example
>
>  s = File.stat("testfile")
>    sprintf("%o", s.mode)          #=> "100644"
>
> I need to check the last three numbers from the octal notation which is
> "644"
> which means:
> rw- for user
> r-- for group
> r-- for other
>
> Does anyone know how i could check just those three numbers and leave
> the rest
>
> Regards
> Loftz
> --
> Posted viahttp://www.ruby-forum.com/.

If you're wanting to compare to the String "644":

s.mode.to_s(8)[-3..-1] == "644"

otherwise, you can mask using bitwise & and compare to the Fixnum
0644:

(s.mode & 0xFFF) == 0644
(s.mode & 07777) == 0644

Jeremy