File Protection by Group
A second level of security, that allows more than one user account to access a
file, is the group permission. As previously pointed out, each user account is
assigned their own group, but that is not the only use for group permissions.
If there is a group of user accounts, all of which are working on the same
document project, it is possible to create a group, such as doc, and assign
each user in the project to that group. This new group is added to the
/etc/group file by the adduser program. To add the group doc the command
would look like:
adduser   group doc
While it is also possible to declare a specific ID for this group, it is not
generally recommended. adduser will assign the next available ID to the group,
and in most cases, this is just what is needed. There are a number of default
groups already provided in /etc/group for those programs that are expecting
particular gid (groud ID) numeric values, so there should never be the need
for a specific gid to be assigned to any particular group.
Once the group has been created, adduser is again used to assign each user
in the documentation project to this new group. To add the fred account to
this new group, root would execute the following command:
adduser fred doc
Now any documents that Fred creates may be assigned to the group doc and
have its group permission bits set so that others in the documentation group
can work on that file as well. To do this for the file private.txt Fred would
first issue the command:
chown fred:doc private.txt
197






footer




 

 

 

 

 Home | About Us | Network | Services | Support | FAQ | Control Panel | Order Online | Sitemap | Contact

affordable web hosting

 

Our partners: PHP: Hypertext Preprocessor Best Web Hosting Java Web Hosting Inexpensive Web Hosting  Jsp Web Hosting

Cheapest Web Hosting Jsp Hosting Cheap Hosting

Visionwebhosting.net Business web hosting division of Web Design Plus. All rights reserved