03-11-2010
kernel giving access for multiple users to access files
hi all,
i want to know y kernel is giving access for multiple users to access a file when one user may be the owner is executing that file. Because other user can manipulate that file when the other user is executing that file, it will give the unexpected result to owner . plz help me out..
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LEARN ABOUT MOJAVE
pts_chown
PTS_CHOWN(1) AFS Command Reference PTS_CHOWN(1)
NAME
pts_chown - Changes the owner of a Protection Database entry
SYNOPSIS
pts chown -name <group name> -owner <new owner>
[-cell <cell name>] [-noauth] [-localauth] [-force] [-help]
pts cho -na <group name> -o <new owner>
[-c <cell name>] [-no] [-l] [-f] [-h]
DESCRIPTION
The pts chown command designates the user or group named by the -owner argument as the owner of the group named by the -name argument, and
records the new owner in the owner field of the group's Protection Database entry.
In the case of regular groups, this command automatically changes the group name's owner prefix (the part of the group name before the
colon) to match the new owner. If the new owner is itself a group, then only its owner prefix, not its complete name, becomes the owner
prefix in the new name. The change to the owner prefix does not propagate to any groups owned by the group, however. To make the owner
prefix of such group-owned groups reflect the new owning group, use the pts rename command.
It is not possible to change a user or machine entry's owner from the default set at creation time, the system:administrators group.
CAUTIONS
While designating a machine as a group's owner does not cause an error, it is not recommended. The Protection Server does not extend the
usual privileges of group ownership to users logged onto the machine.
OPTIONS
-name <group name>
Specifies the current name of the group to which to assign a new owner.
-owner <new owner>
Names the user or group to become the group's owner.
-cell <cell name>
Names the cell in which to run the command. For more details, see pts(1).
-force
Enables the command to continue executing as far as possible when errors or other problems occur, rather than halting execution at the
first error.
-help
Prints the online help for this command. All other valid options are ignored.
-localauth
Constructs a server ticket using a key from the local /etc/openafs/server/KeyFile file. Do not combine this flag with the -cell or
-noauth options. For more details, see pts(1).
-noauth
Assigns the unprivileged identity anonymous to the issuer. For more details, see pts(1).
EXAMPLES
The following example changes the owner of the group "terry:friends" from the user "terry" to the user "pat". A side effect is that the
group name changes to "pat:friends".
% pts chown -name terry:friends -owner pat
The following example changes the owner of the group "terry:friends" from the user "terry" to the group "pat:buddies". A side effect is
that the group name changes to "pat:friends".
% pts chown -name terry:friends -owner pat:buddies
PRIVILEGE REQUIRED
The issuer must belong to the system:administrators group or currently own the group.
SEE ALSO
pts(1), pts_rename(1)
COPYRIGHT
IBM Corporation 2000. <http://www.ibm.com/> All Rights Reserved.
This documentation is covered by the IBM Public License Version 1.0. It was converted from HTML to POD by software written by Chas
Williams and Russ Allbery, based on work by Alf Wachsmann and Elizabeth Cassell.
OpenAFS 2014-04-08 PTS_CHOWN(1)