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Date:	Fri, 31 Jul 2009 12:38:21 -0400
From:	"Larry Hall (Cygwin)" <reply-to-list-only-lh AT cygwin DOT com>
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To:	cygwin AT cygwin DOT com
Subject:	Re: Permission on USB drive
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On 07/31/2009 04:15 AM, Morten Kjærulff wrote:
> Hi,
>
> These files:
>
> $ ls -l
> total 69892
> -rwxr-xr-x 1 ???????? ???????? 2753883 Jul 27 20:41 20090725-0926-IMG_0610.JPG
> -rwx------ 1 ???????? ???????? 2865345 Jul 25 09:29 20090725-0929-IMG_0611.JPG

<snip>

> are pictures from a camera, which I copied with google picasa from the
> camera to my home computer. Some of the pictures have been edited
> (rotated) with picasa. Then I copied them with rsync to my USB drive.
> Now I am looking at them from my work computer.
>
> They do not all have the same permissions, which I don't understand.
> The differences to not match those that I have edited with picasa (I
> am 95% sure). What should I look for?

See <http://cygwin.com/cygwin-ug-net/ntsec.html#ntsec-ids> and
<http://cygwin.com/cygwin-ug-net/ntsec.html#ntsec-files>.  The Windows SID
for the user from your home machine will not match the user on your work
machine.  That's expected.

> Can I somehow set it up, so the files on the USB is readable on any computer?

Sure.  Use 'chmod 644 <files>' or something similar.  You have to give the
permissions you want to all others to facilitate that.  Or you have to
change the owner (through 'chown' or Windows "Take Ownership").

> Are they unreadable on my work computer because I used a cygwin tool
> to copy them to the USB, or is all this pure windows?

No, it a general permissions issue.  See above.

> If I chown the files to my user on my work computer, I can read them
> fine, but then I fear I can't read them at home.

Fear.  Uncertainty.  Doubt.  A Cygwinner feels not these things! ;-)

-- 
Larry Hall                              http://www.rfk.com
RFK Partners, Inc.                      (508) 893-9779 - RFK Office
216 Dalton Rd.                          (508) 893-9889 - FAX
Holliston, MA 01746

_____________________________________________________________________

A: Yes.
 > Q: Are you sure?
 >> A: Because it reverses the logical flow of conversation.
 >>> Q: Why is top posting annoying in email?

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