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A new user can be assigned to a special group set up for just that user and given the user s name. So the new user dylan is given a default group also called dylan. The group dylan will also show up in the listing of groups. This method of assigning default user groups is called the User Private Group (UPG) scheme. UPG is currently used on Red Hat systems. The supplementary groups are additional groups that the user may want to belong to. Traditionally, users were all assigned to one group named users that would subject all users to the group permission controls for the users group. With UPG, each user has its own group, with its own group permissions.
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As with users, you can create a home directory for a group. To do so, you simply create a directory for the group in the /home directory and change its group to that of the group, along with allowing access by any member of the group. The following example creates a directory called engines and changes its group to that of the engines group: mkdir /home/engines chgrp engines /home/engines Then the read, write, and execute permissions for the group level should be set with the chmod command, discussed later in this chapter: chmod g+rwx /home/engines Any member of the engines group can now access the /home/engines directory and any shared files placed therein. This directory becomes a shared directory for the group. You can, in fact, use the same procedure to make other shared directories at any location on the file system. Files within the shared directory should also have their permissions set to allow access by other users in the
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group. When a user places a file in a shared directory, the user needs to set the permissions on that file to allow other members of the group to access it. A read permission will let others display it, write lets them change it, and execute lets them run it (used for scripts and programs). The following example first changes the group for the mymodel file to engines. Then it copies the mymodel file to the /home/engines directory and sets the group read and write permission for the engines group. $ chgrp engines mymodel $ cp mymodel /home/engines $ chmod g+rw /home/engines/mymodel
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Managing Groups with the Red Hat User Manager
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You can add, remove, and modify any group easily with the Red Hat User Manager. First, access the Red Hat User Manager by clicking the User & Groups icon in the System Settings window, listed in the Start Here window. Then, click the tabbed panel labeled Groups in the Red Hat User Manager window. This will list all your current groups. There will be three fields for each entry: Group Name, Group ID, and Group Members. To add a group, just click the Add Group button. This opens a small window where you can enter the group name. The new group will be listed in the User Manager s Groups listing. To add users as members of the group, select the group s entry and click the Properties button. This opens a window with tabbed panels for Group Data and Group Users. The Group Users panel lists all current users with check boxes. Click the check boxes for the users you want to be members of this group. If you want to remove a user as member, click the check box to remove its check. Click OK to effect your changes. If you want to remove a group, just select its entry in the User Manager s Groups panel and then click the Delete button.
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