newbie's question on file permission
Ansgar Burchardt
ansgar at 2008.43-1.org
Fri Aug 1 19:00:02 UTC 2008
Hi,
"Zhengguo Xu" <tworiversfolk at gmail.com> writes:
> sudo chgrp test biology.ppt
> sudo chmod 777 biology.ppt
>
> nothing happened when i run these commands and i tried them with and without
> sudo. the file still has the permission -rwx------ and root is still
> the group.
>
> if it matters, the file is on a usb disk mounted in /media
Not all file systems support storing ownership information and
permissions. What file system are you using on the USB disk [1]?
USB disks are often used together with FAT32 which does not support
permissions. Linux then uses permissions based on flags passed to the
mount command.
Regards,
Ansgar
[1] Running `mount' lists all (mounted) file systems and their type
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PGP: 1024D/595FAD19 739E 2D09 0969 BEA9 9797 B055 DDB0 2FF7 595F AD19
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